god hjul - aocc23 - Advent of Code 2023

commit 3775ab7a1c13ffeed791ba882144da622b5e543b
Author: olikru <olikru@tkruger.se>
Date:   Fri,  5 Jan 2024 21:56:38 +0100

god hjul

Diffstat:
A .clangd  | 2 ++
A Makefile  | 13 +++++++++++++
A README  | 22 ++++++++++++++++++++++
A TODO  | 5 +++++
A day1/Makefile  | 30 ++++++++++++++++++++++++++++++
A day1/common.c  | 3 +++
A day1/common.h  | 12 ++++++++++++
A day1/input  | 1000 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day1/uppga.c  | 37 +++++++++++++++++++++++++++++++++++++
A day1/uppgb.c  | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day10/Makefile  | 30 ++++++++++++++++++++++++++++++
A day10/common.c  | 3 +++
A day10/common.h  | 14 ++++++++++++++
A day10/input  | 140 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day10/uppga.c  | 129 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day10/uppgb.c  | 302 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day11/Makefile  | 30 ++++++++++++++++++++++++++++++
A day11/common.c  | 3 +++
A day11/common.h  | 13 +++++++++++++
A day11/exinput  | 10 ++++++++++
A day11/input  | 140 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day11/uppga.c  | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day11/uppgb.c  | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day12/Makefile  | 30 ++++++++++++++++++++++++++++++
A day12/common.c  | 3 +++
A day12/common.h  | 14 ++++++++++++++
A day12/exinput  | 6 ++++++
A day12/input  | 1000 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day12/uppga.c  | 236 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day12/uppgb.c  | 288 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day13/Makefile  | 30 ++++++++++++++++++++++++++++++
A day13/common.c  | 3 +++
A day13/common.h  | 13 +++++++++++++
A day13/exinput  | 15 +++++++++++++++
A day13/input  | 1387 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day13/uppga.c  | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day13/uppgb.c  | 112 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day14/Makefile  | 30 ++++++++++++++++++++++++++++++
A day14/common.c  | 14 ++++++++++++++
A day14/common.h  | 13 +++++++++++++
A day14/exinput  | 10 ++++++++++
A day14/input  | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day14/uppga.c  | 35 +++++++++++++++++++++++++++++++++++
A day14/uppgb.c  | 187 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day15/Makefile  | 30 ++++++++++++++++++++++++++++++
A day15/common.c  | 3 +++
A day15/common.h  | 15 +++++++++++++++
A day15/exinput  | 1 +
A day15/input  | 1 +
A day15/uppga.c  | 30 ++++++++++++++++++++++++++++++
A day15/uppgb.c  | 139 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day16/Makefile  | 30 ++++++++++++++++++++++++++++++
A day16/common.c  | 3 +++
A day16/common.h  | 13 +++++++++++++
A day16/exinput  | 10 ++++++++++
A day16/input  | 110 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day16/uppga.c  | 227 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day16/uppgb.c  | 298 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day17/Makefile  | 30 ++++++++++++++++++++++++++++++
A day17/common.c  | 3 +++
A day17/common.h  | 14 ++++++++++++++
A day17/exinput  | 13 +++++++++++++
A day17/input  | 141 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day17/uppga.c  | 111 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day17/uppgb.c  | 111 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day18/Makefile  | 30 ++++++++++++++++++++++++++++++
A day18/common.c  | 22 ++++++++++++++++++++++
A day18/common.h  | 16 ++++++++++++++++
A day18/exinput  | 14 ++++++++++++++
A day18/input  | 640 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day18/uppga.c  | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
A day18/uppgb.c  | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day19/Makefile  | 30 ++++++++++++++++++++++++++++++
A day19/common.c  | 107 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day19/common.h  | 28 ++++++++++++++++++++++++++++
A day19/exinput  | 17 +++++++++++++++++
A day19/input  | 707 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day19/uppga.c  | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day19/uppgb.c  | 389 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day2/Makefile  | 30 ++++++++++++++++++++++++++++++
A day2/common.c  | 3 +++
A day2/common.h  | 13 +++++++++++++
A day2/input  | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day2/uppga.c  | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day2/uppgb.c  | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day20/Makefile  | 31 +++++++++++++++++++++++++++++++
A day20/common.c  | 3 +++
A day20/common.h  | 16 ++++++++++++++++
A day20/exinput  | 5 +++++
A day20/exinput2  | 5 +++++
A day20/input  | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day20/uppga.c  | 230 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day20/uppgb.c  | 254 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day21/Makefile  | 30 ++++++++++++++++++++++++++++++
A day21/common.c  | 47 +++++++++++++++++++++++++++++++++++++++++++++++
A day21/common.h  | 23 +++++++++++++++++++++++
A day21/exinput  | 11 +++++++++++
A day21/input  | 131 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day21/uppga.c  | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day21/uppgb.c  | 129 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day22/Makefile  | 30 ++++++++++++++++++++++++++++++
A day22/common.c  | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day22/common.h  | 29 +++++++++++++++++++++++++++++
A day22/exinput  | 7 +++++++
A day22/input  | 1203 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day22/uppga.c  | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day22/uppgb.c  | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day23/Makefile  | 30 ++++++++++++++++++++++++++++++
A day23/common.c  | 34 ++++++++++++++++++++++++++++++++++
A day23/common.h  | 17 +++++++++++++++++
A day23/exinput  | 23 +++++++++++++++++++++++
A day23/input  | 141 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day23/uppga.c  | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day23/uppgb.c  | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day24/Makefile  | 30 ++++++++++++++++++++++++++++++
A day24/common.c  | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day24/common.h  | 29 +++++++++++++++++++++++++++++
A day24/exinput  | 5 +++++
A day24/input  | 300 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day24/uppga.c  | 152 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day24/uppgb.c  | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day25/Makefile  | 26 ++++++++++++++++++++++++++
A day25/common.h  | 15 +++++++++++++++
A day25/exinput  | 13 +++++++++++++
A day25/input  | 1220 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day25/uppga.c  | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day3/Makefile  | 30 ++++++++++++++++++++++++++++++
A day3/common.c  | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day3/common.h  | 20 ++++++++++++++++++++
A day3/exinput  | 10 ++++++++++
A day3/input  | 140 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day3/uppga.c  | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day3/uppgb.c  | 104 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day4/Makefile  | 30 ++++++++++++++++++++++++++++++
A day4/common.c  | 29 +++++++++++++++++++++++++++++
A day4/common.h  | 15 +++++++++++++++
A day4/exinput  | 6 ++++++
A day4/input  | 202 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day4/uppga.c  | 34 ++++++++++++++++++++++++++++++++++
A day4/uppgb.c  | 43 +++++++++++++++++++++++++++++++++++++++++++
A day5/Makefile  | 30 ++++++++++++++++++++++++++++++
A day5/common.c  | 47 +++++++++++++++++++++++++++++++++++++++++++++++
A day5/common.h  | 22 ++++++++++++++++++++++
A day5/exinput  | 33 +++++++++++++++++++++++++++++++++
A day5/input  | 236 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day5/uppga.c  | 47 +++++++++++++++++++++++++++++++++++++++++++++++
A day5/uppgb.c  | 108 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day6/Makefile  | 30 ++++++++++++++++++++++++++++++
A day6/common.c  | 35 +++++++++++++++++++++++++++++++++++
A day6/common.h  | 17 +++++++++++++++++
A day6/exinput  | 2 ++
A day6/input  | 2 ++
A day6/uppga.c  | 22 ++++++++++++++++++++++
A day6/uppgb.c  | 28 ++++++++++++++++++++++++++++
A day7/Makefile  | 30 ++++++++++++++++++++++++++++++
A day7/common.c  | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day7/common.h  | 20 ++++++++++++++++++++
A day7/exinput  | 5 +++++
A day7/input  | 1000 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day7/uppga.c  | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day7/uppgb.c  | 130 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day8/Makefile  | 30 ++++++++++++++++++++++++++++++
A day8/common.c  | 20 ++++++++++++++++++++
A day8/common.h  | 19 +++++++++++++++++++
A day8/input  | 736 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day8/uppga.c  | 28 ++++++++++++++++++++++++++++
A day8/uppgb.c  | 122 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day9/Makefile  | 30 ++++++++++++++++++++++++++++++
A day9/common.c  | 3 +++
A day9/common.h  | 14 ++++++++++++++
A day9/exinput  | 3 +++
A day9/input  | 200 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day9/uppga.c  | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A day9/uppgb.c  | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A template/Makefile  | 30 ++++++++++++++++++++++++++++++
A template/common.c  | 3 +++
A template/common.h  | 13 +++++++++++++
A template/uppga.c  | 7 +++++++
A template/uppgb.c  | 7 +++++++
A utils/Makefile  | 19 +++++++++++++++++++
A utils/dg.c  | 21 +++++++++++++++++++++
A utils/dg.h  | 15 +++++++++++++++
A utils/dict.c  | 111 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/dict.h  | 33 +++++++++++++++++++++++++++++++++
A utils/fheap.c  | 249 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/fheap.h  | 40 ++++++++++++++++++++++++++++++++++++++++
A utils/graph.c  | 22 ++++++++++++++++++++++
A utils/graph.h  | 15 +++++++++++++++
A utils/ht.c  | 40 ++++++++++++++++++++++++++++++++++++++++
A utils/ht.h  | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/play/Makefile  | 30 ++++++++++++++++++++++++++++++
A utils/play/tests.c  | 38 ++++++++++++++++++++++++++++++++++++++
A utils/reading.c  | 158 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/reading.h  | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/sd.c  | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/sd.h  | 103 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/set_u64.c  | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/set_u64.h  | 28 ++++++++++++++++++++++++++++
A utils/set_u64p.c  | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/set_u64p.h  | 28 ++++++++++++++++++++++++++++
A utils/smallset.c  | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/smallset.h  | 132 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/stack_sd.c  | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/stack_sd.h  | 97 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/stack_str.c  | 38 ++++++++++++++++++++++++++++++++++++++
A utils/stack_str.h  | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/stack_u64.c  | 40 ++++++++++++++++++++++++++++++++++++++++
A utils/stack_u64.h  | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/test/Makefile  | 43 +++++++++++++++++++++++++++++++++++++++++++
A utils/test/test_ht.c  | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/test/test_ht.h  | 11 +++++++++++
A utils/test/test_reading.c  | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/test/test_reading.h  | 12 ++++++++++++
A utils/test/test_sd.c  | 93 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/test/test_sd.h  | 13 +++++++++++++
A utils/test/test_set_u64.c  | 19 +++++++++++++++++++
A utils/test/test_set_u64.h  | 9 +++++++++
A utils/test/test_smallset.c  | 207 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/test/test_smallset.h  | 17 +++++++++++++++++
A utils/test/test_stack_sd.c  | 140 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/test/test_stack_sd.h  | 14 ++++++++++++++
A utils/test/test_stack_str.c  | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/test/test_stack_str.h  | 12 ++++++++++++
A utils/test/test_stack_u64.c  | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/test/test_stack_u64.h  | 12 ++++++++++++
A utils/test/testfile1.txt  | 3 +++
A utils/test/testfile2.txt  | 2 ++
A utils/test/tests.c  | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/wdg.c  | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A utils/wdg.h  | 18 ++++++++++++++++++

230 files changed, 21659 insertions(+), 0 deletions(-)
diff --git a/.clangd b/.clangd
@@ -0,0 +1,2 @@
+CompileFlags:
+  Add: [-xc, -std=c99, -I../utils, -std=c99, -pedantic, -Wall, -Werror, -Wstrict-prototypes, -Wmissing-prototypes, -Wmissing-declarations, -Wshadow, -Wpointer-arith, -Wcast-qual, -Wsign-compare, -O2, -fstack-protector-all, -Wtype-limits, -fno-common, -fno-builtin, -I/usr/local/include, -I/usr/local/include/flint, -I/usr/local/include/igraph]
diff --git a/Makefile b/Makefile
@@ -0,0 +1,13 @@
+MAKE_SUBDIRS=utils day1 day2 day3 day4 day5 day6 day7 day8 day9 day10 day11 day12 day13 day14 day15 day16 day17 day18 day19 day20 day21 day22 day23 day24
+SMAKER=$(addsuffix maker,$(MAKE_SUBDIRS))
+SCLEAN=$(addsuffix clean,$(MAKE_SUBDIRS))
+
+all: $(SMAKER)
+
+clean: $(SCLEAN)
+
+%maker: %
+	make -C $<
+
+%clean: %
+	make -C $< clean
diff --git a/README b/README
@@ -0,0 +1,22 @@
+Advent of Code '23
+==================
+
+Mine (krutimyltan2's) solutions for the challenges in Advent of Code
+2023. Primarily I try to use C and build a library of useful tools
+that may be reused.
+
+To initialize a new day of solutions, copy the `template` directory to
+a directory called `day<n>`.
+
+Utilities
+---------
+
+The following util modules are available:
+
+* __reading__ -- utils for reading input for file (e.g. readlines)
+* __sd__ -- sized data
+* __smallset__ -- subsets of [n] for small [n], binary impl
+* __stack_sd__ -- stack for sd
+* __stack_str__ -- stack for strings (char pointers)
+* __stack_u64__ -- stack for uint64_t's
+* __ht__ -- hashtable for sd's
diff --git a/TODO b/TODO
@@ -0,0 +1,5 @@
+* Add unit tests for sread_next_i64.
+* Add unit tests for new utils (wdg, graph, fheap etc.)
+* Redo day20, but with a general, non-shitty heuristic solution.
+* Redo day23 by implementing dynamic programming solution to
+  longest simple path problem.
diff --git a/day1/Makefile b/day1/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day1/common.c b/day1/common.c
@@ -0,0 +1,3 @@
+#include "common.h"
+
+size_t fn(char **lines, size_t nlines) { return 0; }
diff --git a/day1/common.h b/day1/common.h
@@ -0,0 +1,12 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <reading.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+size_t fn(char **lines, size_t nlines);
+
+#endif
diff --git a/day1/input b/day1/input
@@ -0,0 +1,1000 @@
+6798seven
+six8b32csscsdgjsevenfivedlhzhc
+fcvvkvjjnhfivesixfiveninesxlvnhfckc54
+feightwo4twofivefour
+cgpzm2sevenone68636
+498879
+fivetwo2plltvdfourhhgrfn
+onertxzlzdnxn2seven
+ninethree4v1five
+5pnnss16lzbsmcckeightdseven
+jthree249four2cjzqmmbrqnnine
+foursixfourfbgvqm1rchdlmzhtzqqfjzpmln
+twojtwoscbrtgmnqzvbfbzvrtkxhmf76nine
+2fourtwo
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diff --git a/day1/uppga.c b/day1/uppga.c
@@ -0,0 +1,37 @@
+#include "common.h"
+
+#include <stdlib.h>
+
+static int is_numeric(const char c) { return ('0' <= c) && (c <= '9'); }
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  size_t i;
+  char *cc;
+  char fc[3];
+  char ci;
+  int x = 0;
+  for (i = 0; i < nlines; i++) {
+    cc = lines[i];
+    ci = 0;
+    fc[1] = '\0';
+    while (*cc != '\0') {
+      if (is_numeric(*cc)) {
+        *(fc + ci) = *cc;
+        if (ci == 0)
+          ci++;
+      }
+      cc++;
+    }
+
+    if (fc[1] == '\0')
+      fc[1] = fc[0];
+
+    fc[2] = '\0';
+    x += atoi(fc);
+  }
+
+  printf("%d\n", x);
+}
diff --git a/day1/uppgb.c b/day1/uppgb.c
@@ -0,0 +1,75 @@
+#include "common.h"
+
+static int get_digit(const char *c) {
+  if (*c == '\0')
+    return -1;
+
+  if (('0' <= c[0]) && (c[0] <= '9'))
+    return (int)(c[0] - '0');
+
+  if (strncmp(c, "one", 3) == 0)
+    return 1;
+  if (strncmp(c, "two", 3) == 0)
+    return 2;
+  if (strncmp(c, "three", 5) == 0)
+    return 3;
+  if (strncmp(c, "four", 4) == 0)
+    return 4;
+  if (strncmp(c, "five", 4) == 0)
+    return 5;
+  if (strncmp(c, "six", 3) == 0)
+    return 6;
+  if (strncmp(c, "seven", 5) == 0)
+    return 7;
+  if (strncmp(c, "eight", 5) == 0)
+    return 8;
+  if (strncmp(c, "nine", 4) == 0)
+    return 9;
+
+  return -1;
+}
+
+static int get_first_digit(const char *c) {
+  const char *cur = c;
+  int digit;
+
+  while (*cur != '\0') {
+    digit = get_digit(cur);
+    if (digit != -1)
+      return digit;
+    cur++;
+  }
+
+  return -1;
+}
+
+static int get_last_digit(const char *str) {
+  size_t len = strnlen(str, 500);
+  const char *cur = str + len;
+  int digit;
+
+  while (cur >= str) {
+    digit = get_digit(cur);
+    if (digit != -1)
+      return digit;
+    cur--;
+  }
+
+  return -1;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  size_t i;
+  int first, last;
+  int x = 0;
+  for (i = 0; i < nlines; i++) {
+    first = get_first_digit(lines[i]);
+    last = get_last_digit(lines[i]);
+    x += first * 10 + last;
+  }
+
+  printf("%d\n", x);
+}
diff --git a/day10/Makefile b/day10/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o ../utils/stack_u64.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day10/common.c b/day10/common.c
@@ -0,0 +1,3 @@
+#include "common.h"
+
+size_t fn(char **lines, size_t nlines) { return 0; }
diff --git a/day10/common.h b/day10/common.h
@@ -0,0 +1,14 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <reading.h>
+#include <stack_u64.h>
+
+size_t fn(char **lines, size_t nlines);
+
+#endif
diff --git a/day10/input b/day10/input
@@ -0,0 +1,140 @@
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diff --git a/day10/uppga.c b/day10/uppga.c
@@ -0,0 +1,129 @@
+#include "common.h"
+
+typedef struct {
+  size_t na;
+  size_t nb;
+} pos_t;
+
+static inline pos_t compute_nbrs(size_t row, size_t col, char **lines,
+                                 size_t nrows, size_t ncols) {
+  pos_t r;
+
+  switch (lines[row][col]) {
+  case '|':
+    if (row == 0 || row == nrows - 1) {
+      r.na = SIZE_MAX;
+      r.nb = SIZE_MAX;
+    } else {
+      r.na = (row - 1) * ncols + col;
+      r.nb = (row + 1) * ncols + col;
+    }
+    break;
+  case '-':
+    if (col == 0 || col == ncols - 1) {
+      r.na = SIZE_MAX;
+      r.nb = SIZE_MAX;
+    } else {
+      r.na = row * ncols + col - 1;
+      r.nb = row * ncols + col + 1;
+    }
+    break;
+  case 'F':
+    if (col == ncols - 1 || row == nrows - 1) {
+      r.na = SIZE_MAX;
+      r.nb = SIZE_MAX;
+    } else {
+      r.na = row * ncols + col + 1;
+      r.nb = (row + 1) * ncols + col;
+    }
+    break;
+  case '7':
+    if (col == 0 || row == nrows - 1) {
+      r.na = SIZE_MAX;
+      r.nb = SIZE_MAX;
+    } else {
+      r.na = row * ncols + col - 1;
+      r.nb = (row + 1) * ncols + col;
+    }
+    break;
+  case 'L':
+    if (col == ncols - 1 || row == 0) {
+      r.na = SIZE_MAX;
+      r.nb = SIZE_MAX;
+    } else {
+      r.na = (row - 1) * ncols + col;
+      r.nb = row * ncols + col + 1;
+    }
+    break;
+  case 'J':
+    if (col == 0 || row == 0) {
+      r.na = SIZE_MAX;
+      r.nb = SIZE_MAX;
+    } else {
+      r.na = (row - 1) * ncols + col;
+      r.nb = row * ncols + col - 1;
+    }
+    break;
+  default: // S or .
+    r.na = SIZE_MAX;
+    r.nb = SIZE_MAX;
+  }
+
+  return r;
+}
+
+static inline size_t traverse(size_t start, size_t next, pos_t *ns) {
+  size_t head = next;
+  size_t tail = start;
+  size_t steps = 0;
+
+  if (ns[head].na != tail && ns[head].nb != tail) {
+    return SIZE_MAX;
+  }
+
+  while (head != start && ns[head].na != SIZE_MAX) {
+    size_t tmp = head;
+    if (ns[head].na == tail) {
+      head = ns[head].nb;
+    } else {
+      head = ns[head].na;
+    }
+    tail = tmp;
+    steps++;
+  }
+
+  if (head == start)
+    return steps;
+
+  return SIZE_MAX;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t i, j;
+  size_t nlines = readlines(&lines, "input");
+
+  size_t ncols = strlen(lines[0]) - 1;
+
+  size_t start;
+  pos_t ns[nlines * ncols];
+  for (i = 0; i < nlines; i++) {
+    for (j = 0; j < ncols; j++) {
+      ns[i * ncols + j] = compute_nbrs(i, j, lines, nlines, ncols);
+      if (lines[i][j] == 'S') {
+        start = i * ncols + j;
+      }
+    }
+  }
+
+  size_t r;
+  if ((r = traverse(start, start + 1, ns)) != SIZE_MAX) {
+    printf("%zu\n", (r + 1) / 2);
+  } else if ((r = traverse(start, start - 1, ns)) != SIZE_MAX) {
+    printf("%zu\n", (r + 1) / 2);
+  } else if ((r = traverse(start, start + ncols, ns)) != SIZE_MAX) {
+    printf("%zu\n", (r + 1) / 2);
+  } else {
+    printf("bad\n");
+  }
+}
diff --git a/day10/uppgb.c b/day10/uppgb.c
@@ -0,0 +1,302 @@
+#include "common.h"
+
+typedef struct {
+  size_t na;
+  size_t nb;
+} pos_t;
+
+static inline pos_t compute_nbrs(size_t row, size_t col, char **lines,
+                                 size_t nrows, size_t ncols) {
+  pos_t r;
+
+  switch (lines[row][col]) {
+  case '|':
+    if (row == 0 || row == nrows - 1) {
+      r.na = SIZE_MAX;
+      r.nb = SIZE_MAX;
+    } else {
+      r.na = (row - 1) * ncols + col;
+      r.nb = (row + 1) * ncols + col;
+    }
+    break;
+  case '-':
+    if (col == 0 || col == ncols - 1) {
+      r.na = SIZE_MAX;
+      r.nb = SIZE_MAX;
+    } else {
+      r.na = row * ncols + col - 1;
+      r.nb = row * ncols + col + 1;
+    }
+    break;
+  case 'F':
+    if (col == ncols - 1 || row == nrows - 1) {
+      r.na = SIZE_MAX;
+      r.nb = SIZE_MAX;
+    } else {
+      r.na = row * ncols + col + 1;
+      r.nb = (row + 1) * ncols + col;
+    }
+    break;
+  case '7':
+    if (col == 0 || row == nrows - 1) {
+      r.na = SIZE_MAX;
+      r.nb = SIZE_MAX;
+    } else {
+      r.na = row * ncols + col - 1;
+      r.nb = (row + 1) * ncols + col;
+    }
+    break;
+  case 'L':
+    if (col == ncols - 1 || row == 0) {
+      r.na = SIZE_MAX;
+      r.nb = SIZE_MAX;
+    } else {
+      r.na = (row - 1) * ncols + col;
+      r.nb = row * ncols + col + 1;
+    }
+    break;
+  case 'J':
+    if (col == 0 || row == 0) {
+      r.na = SIZE_MAX;
+      r.nb = SIZE_MAX;
+    } else {
+      r.na = (row - 1) * ncols + col;
+      r.nb = row * ncols + col - 1;
+    }
+    break;
+  default: // S or .
+    r.na = SIZE_MAX;
+    r.nb = SIZE_MAX;
+  }
+
+  return r;
+}
+
+static inline size_t traverse(char *type, size_t start, size_t next, pos_t *ns,
+                              uint8_t *visited, size_t nn) {
+  size_t head = next;
+  size_t tail = start;
+  size_t steps = 0;
+
+  int exit = 0;
+  if (head > tail) {
+    if (head - tail == 1) {
+      exit = 1; // east
+    } else {
+      exit = 2; // south
+    }
+  } else {
+    if (tail - head == 1) {
+      exit = 3; // west
+    } else {
+      exit = 4; // north
+    }
+  }
+
+  memset(visited, nn, sizeof(*visited));
+  visited[head] = 1;
+  visited[tail] = 1;
+
+  if (ns[head].na != tail && ns[head].nb != tail) {
+    return SIZE_MAX;
+  }
+
+  while (head != start && ns[head].na != SIZE_MAX) {
+    size_t tmp = head;
+    if (ns[head].na == tail) {
+      head = ns[head].nb;
+    } else {
+      head = ns[head].na;
+    }
+    tail = tmp;
+    visited[head] = 1;
+    steps++;
+  }
+
+  int enter = 0;
+  if (head > tail) {
+    if (head - tail == 1) {
+      enter = 3; // east
+    } else {
+      enter = 4; // south
+    }
+  } else {
+    if (tail - head == 1) {
+      enter = 1; // west
+    } else {
+      enter = 2; // north
+    }
+  }
+
+  if (exit == 1) {
+    if (enter == 2) {
+      *type = 'F';
+    } else if (enter == 3) {
+      *type = '-';
+    } else if (enter == 4) {
+      *type = 'L';
+    }
+  } else if (exit == 2) {
+    if (enter == 1) {
+      *type = 'F';
+    } else if (enter == 3) {
+      *type = '7';
+    } else if (enter == 4) {
+      *type = '|';
+    }
+  } else if (exit == 3) {
+    if (enter == 1) {
+      *type = '-';
+    } else if (enter == 2) {
+      *type = '7';
+    } else if (enter == 4) {
+      *type = 'J';
+    }
+  } else if (exit == 4) {
+    if (enter == 1) {
+      *type = 'L';
+    } else if (enter == 2) {
+      *type = '|';
+    } else if (enter == 3) {
+      *type = 'J';
+    }
+  }
+
+  if (head == start)
+    return steps;
+
+  return SIZE_MAX;
+}
+
+#define IDX(r, c, n) ((3 * n) * (3 * r + 1) + (3 * c) + 1)
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t i, j;
+  size_t nlines = readlines(&lines, "input");
+
+  size_t ncols = strlen(lines[0]) - 1;
+
+  size_t start;
+  pos_t ns[nlines * ncols];
+  for (i = 0; i < nlines; i++) {
+    for (j = 0; j < ncols; j++) {
+      ns[i * ncols + j] = compute_nbrs(i, j, lines, nlines, ncols);
+      if (lines[i][j] == 'S') {
+        start = i * ncols + j;
+      }
+    }
+  }
+
+  uint8_t visited[nlines * ncols];
+  size_t r;
+  char type;
+  if ((r = traverse(&type, start, start + 1, ns, visited, nlines * ncols)) !=
+      SIZE_MAX) {
+  } else if ((r = traverse(&type, start, start - 1, ns, visited,
+                           nlines * ncols)) != SIZE_MAX) {
+  } else if ((r = traverse(&type, start, start + ncols, ns, visited,
+                           nlines * ncols)) != SIZE_MAX) {
+  } else {
+    printf("bad\n");
+    exit(1);
+  }
+  visited[0] = 0;
+
+  for (i = 0; i < nlines; i++) {
+    for (j = 0; j < ncols; j++) {
+      if (!visited[i * ncols + j]) {
+        lines[i][j] = '.';
+      }
+      if (lines[i][j] == 'S')
+        lines[i][j] = type;
+    }
+  }
+
+  uint8_t *expander = calloc((3 * ncols * 3 * nlines), sizeof(*expander));
+
+  for (i = 0; i < nlines; i++) {
+    for (j = 0; j < ncols; j++) {
+      switch (lines[i][j]) {
+      case '-':
+        expander[IDX(i, j, ncols)] = 1;
+        expander[IDX(i, j, ncols) - 1] = 1;
+        expander[IDX(i, j, ncols) + 1] = 1;
+        break;
+      case '|':
+        expander[IDX(i, j, ncols)] = 1;
+        expander[IDX(i, j, ncols) - 3 * ncols] = 1;
+        expander[IDX(i, j, ncols) + 3 * ncols] = 1;
+        break;
+      case 'F':
+        expander[IDX(i, j, ncols)] = 1;
+        expander[IDX(i, j, ncols) + 1] = 1;
+        expander[IDX(i, j, ncols) + 3 * ncols] = 1;
+        break;
+      case '7':
+        expander[IDX(i, j, ncols)] = 1;
+        expander[IDX(i, j, ncols) - 1] = 1;
+        expander[IDX(i, j, ncols) + 3 * ncols] = 1;
+        break;
+      case 'L':
+        expander[IDX(i, j, ncols)] = 1;
+        expander[IDX(i, j, ncols) + 1] = 1;
+        expander[IDX(i, j, ncols) - 3 * ncols] = 1;
+        break;
+      case 'J':
+        expander[IDX(i, j, ncols)] = 1;
+        expander[IDX(i, j, ncols) - 1] = 1;
+        expander[IDX(i, j, ncols) - 3 * ncols] = 1;
+        break;
+      default:
+        expander[IDX(i, j, ncols)] = 0;
+        break;
+      }
+    }
+  }
+
+  stack_u64 stack;
+  stack_u64_init(&stack);
+  stack_u64_push(&stack, 0);
+  expander[0] = 1;
+
+  size_t x;
+  while (stack.nmemb > 0) {
+    x = stack_u64_pop(&stack);
+
+    if (x % (3 * ncols) != 0 && expander[x - 1] == 0) {
+      stack_u64_push(&stack, x - 1);
+      expander[x - 1] = 1;
+    }
+
+    if ((x + 1) % (3 * ncols) != 0 && expander[x + 1] == 0) {
+      stack_u64_push(&stack, x + 1);
+      expander[x + 1] = 1;
+    }
+
+    if ((x >= 3 * ncols) && expander[x - 3 * ncols] == 0) {
+      stack_u64_push(&stack, x - 3 * ncols);
+      expander[x - 3 * ncols] = 1;
+    }
+
+    if ((x < (3 * nlines - 1) * (3 * ncols)) && expander[x + 3 * ncols] == 0) {
+      stack_u64_push(&stack, x + 3 * ncols);
+      expander[x + 3 * ncols] = 1;
+    }
+  }
+
+  uint64_t count = 0;
+  for (i = 0; i < 3 * nlines; i++) {
+    for (j = 0; j < 3 * ncols; j++) {
+      if (!expander[(3 * ncols) * i + j]) {
+        if (i % 3 == 1 && j % 3 == 1) {
+          count++;
+        }
+      }
+    }
+  }
+
+  printf("%llu\n", count);
+
+  free(expander);
+}
diff --git a/day11/Makefile b/day11/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day11/common.c b/day11/common.c
@@ -0,0 +1,3 @@
+#include "common.h"
+
+size_t fn(char **lines, size_t nlines) { return 0; }
diff --git a/day11/common.h b/day11/common.h
@@ -0,0 +1,13 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <reading.h>
+
+size_t fn(char **lines, size_t nlines);
+
+#endif
diff --git a/day11/exinput b/day11/exinput
@@ -0,0 +1,10 @@
+...#......
+.......#..
+#.........
+..........
+......#...
+.#........
+.........#
+..........
+.......#..
+#...#.....
diff --git a/day11/input b/day11/input
@@ -0,0 +1,140 @@
+..................................................................................................#..................#......................
+............#...............................................#.........#........................................#............................
+........................#................#.........#....................................................#......................#.......#....
+....#............................................................#.............#............................................................
+...............................................#....................................................#.......................................
+...........................#..........................#.....................................................................................
+..................................#...................................................................................#............#........
+...................#.....................................................#....................................................#.........#...
+.......#.................................#.......#...........#...............................#.............#.....#..........................
+............................................................................................................................................
+....................................................................#.........#........#....................................................
+.#........#.....#.......#..............................................................................#.........................#..........
+............................................#...........................................................................#...................
+.......................................#.......................#............................................................................
+.......#....................#............................#......................................................#...........................
+.............#..............................................................#.....#......................#.................#................
+...........................................................................................#................................................
+.........................#............................#.....#...............................................................................
+...................................#...................................#....................................................................
+........................................................................................#............................#................#.....
+..............#......#........#.........#.........................#................#........................................................
+....#...........................................................................................#........................#..................
+............................................................................................................................................
+............................................................#...............#...........................#........................#..........
+...................................................#.............................#.................#........................................
+..#......................................................................................................................................#..
+...................#....................#..............................#....................#...................#.........#.................
+.......................................................#....................................................................................
+......#.............................#..............................................#........................................................
+...........................................................................#....................#.........#.................................
+....................................................................................................................#.......................
+#............................#............................................................#...................................#.......#.....
+...................................................#............#...........................................................................
+........................#................#........................................................#......................#..................
+.......#.......................................#.................................................................#..........................
+...........................................................#...............................................#................................
+..#.................................#................#.......................................................................#..............
+.............#....................................................#.........................................................................
+.........................................................................#.........#.....#..........................#...............#.......
+....................#.......#..................................................................#............................................
+..................................#............#...............#............................................................................
+.#.......#.............................#....................................#...............................................................
+.........................#...........................#.............#................................#..........#.........#..................
+.....#.........................#............................................................................................................
+...............#............................................#...........#...................................................................
+....................................#............................................#.....#.................#..........#........#..............
+............................................................................................................................................
+.#................#.................................................................................................................#.......
+.........................................#..............#......................................#.....#......................................
+.....#.....#...............#................................................................................................................
+.................................#.........................................................................#.............#.......#..........
+.............................................................................#.........................................................#....
+.......................................#.......................#............................................................................
+.................#.................................#.....#..........#.....................#.....................#...........................
+............#..................................................................................................................#............
+#...................................#.......................................................................................................
+........#..............#..............................#..................................................................#..................
+............................................#..............#................#......................................#........................
+............................................................................................................................................
+...................#......#.......................#..............#..........................................................#.....#........#
+................................#............................................................#..............................................
+......#...................................#.......................................#...............#.........................................
+.....................................#........................#.......#......................................#.................#............
+...........#...........#...............................#.............................................................................#......
+.#...........................................#.........................................................................#....................
+............................................................................................................................................
+..................................................................#...............................................#.........................
+..................................................................................#.......#................#................#...............
+.........................#.......#...........................................#........................................................#.....
+.....#..............#......................#.........#......#.........................................#.....................................
+.....................................................................................................................#......................
+....................................................................................#.....................................................#.
+.............#.......................#......................................................................................................
+.#......................#....................#.....................#.............................................................#..........
+..................................................#.........................................................#...............................
+.................................#........................................#.................................................................
+.....................................................................................#..............................................#.......
+............................................................................................................................................
+.......#..................#.............................#........................#.................#.................#....................#.
+..........................................................................................#.................................................
+....................................#..........................#.........................................#.....................#............
+......................#...................#..................................#....................................#.........................
+....#........#.............................................................................................................#................
+...............................#...............#......................#...............................#.....................................
+.........#.......#.......#..................................................................................................................
+.#.....................................................#....................................#.............#...........................#.....
+...........................................#......#......................#.....................................#............................
+.............................................................#..............................................................................
+.............................#......#..........................................#............................................................
+....#..................#............................................#...............................#.......................................
+.........#.......#.............................#.........................................#..................#........#............#.........
+.......................................................................................................................................#....
+#.............................................................................................#.............................................
+...................................#..............................#......................................................#..................
+............................#...........................#................#.............................#.......#..............#.............
+................................................#.........................................................................................#.
+........#.............#.....................................................................................................................
+....................................................................#......................................................#................
+............................................................#........................................#......................................
+.............#...................#.................................................#........................................................
+.............................................................................#.......................................#......................
+.........#...................#........#.........#........................................................#..............................#...
+.#....................................................................#..................................................#.......#..........
+................#...............................................................................................#...........................
+......................#....................#............#...............................#...................................................
+......#.......................................................#...................................#.........................................
+.........................................................................#......#............................................#..............
+..........#.........................................................#.......................................................................
+............................#.........#................................................................#............#.......................
+.......................#......................................................................#.............#...............................
+................#.......................................#...............................................................................#...
+#..............................#.....................................................#......................................................
+............#....................................................................................#..............#.......#...................
+.....................#..............#............................#..........................................................................
+....#.............................................................................#.......................................................#.
+.....................................................................................................#.....#.......................#........
+...............#..............#............#.............................................#................................#.................
+...........................................................#.........................................................#......................
+.....................................................#...........................................#..............#...........................
+...........#...............#.......................................#...............#........................................................
+................................#...........................................................................................................
+................#.........................#...............................#.............#.......................................#.....#.....
+...............................................................#.............................#........#...............#.....................
+..#.........................................................................................................................................
+............................#......#................................#.............#...............#.........................................
+...........#.........#.............................#.........................................................#..............................
+.....#...................................................#..................#..................................................#...........#
+..........................................#..............................................................#..................................
+.....................................#......................................................................................................
+.......................#......#............................................................#.......................#........#.....#.........
+.#........#.......................................#.........................................................#...............................
+................#................................................................#..........................................................
+.........................................#.............................................#....................................................
+...............................................#.......................................................................#........#...........
+............................................................................................................................................
+..............................#.........................#......#....................#.......................................................
+.............................................................................................................#..............................
+.................#.......................................................................................................................#..
+........#................................#.........................#............#.........#......#........................#.................
+........................#...............................................................................#...................................
diff --git a/day11/uppga.c b/day11/uppga.c
@@ -0,0 +1,98 @@
+#include "common.h"
+
+static inline int is_expandable_row(size_t i, char **lines, size_t ncols) {
+  size_t j;
+  for (j = 0; j < ncols; j++) {
+    if (lines[i][j] != '.')
+      return 0;
+  }
+  return 1;
+}
+
+static inline int is_expandable_col(size_t i, char **lines, size_t nrows) {
+  size_t j;
+  for (j = 0; j < nrows; j++) {
+    if (lines[j][i] != '.')
+      return 0;
+  }
+  return 1;
+}
+
+static inline int isin(size_t i, size_t *lst, size_t nlst) {
+  size_t j;
+  for (j = 0; j < nlst; j++) {
+    if (lst[j] == i)
+      return 1;
+  }
+
+  return 0;
+}
+
+static inline uint64_t count_betw(size_t ca, size_t cb, size_t *lst,
+                                  size_t nlst) {
+  size_t mi = ca > cb ? cb : ca;
+  size_t ma = ca > cb ? ca : cb;
+
+  uint64_t count = 0;
+  size_t i;
+  for (i = mi; i < ma; i++) {
+    if (isin(i, lst, nlst)) {
+      count += 2;
+    } else {
+      count++;
+    }
+  }
+
+  return count;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t i, j;
+  size_t nrows = readlines(&lines, "input");
+  size_t ncols = strlen(lines[0]) - 1;
+
+  size_t expand_cols[2 * ncols];
+  size_t expand_rows[2 * nrows];
+  size_t nexpand_cols = 0;
+  size_t nexpand_rows = 0;
+
+  for (i = 0; i < nrows; i++) {
+    if (is_expandable_row(i, lines, ncols)) {
+      expand_rows[nexpand_rows] = i;
+      nexpand_rows++;
+    }
+  }
+
+  for (i = 0; i < ncols; i++) {
+    if (is_expandable_col(i, lines, nrows)) {
+      expand_cols[nexpand_cols] = i;
+      nexpand_cols++;
+    }
+  }
+
+  size_t galaxies[4 * ncols * nrows][2];
+  size_t ngalaxies = 0;
+  for (i = 0; i < nrows; i++) {
+    for (j = 0; j < ncols; j++) {
+      if (lines[i][j] == '#') {
+        galaxies[ngalaxies][0] = i;
+        galaxies[ngalaxies][1] = j;
+        ngalaxies++;
+      }
+    }
+  }
+
+  uint64_t summarum = 0;
+  for (i = 0; i < ngalaxies - 1; i++) {
+    for (j = i + 1; j < ngalaxies; j++) {
+      uint64_t rowc =
+          count_betw(galaxies[i][0], galaxies[j][0], expand_rows, nexpand_rows);
+      uint64_t colc =
+          count_betw(galaxies[i][1], galaxies[j][1], expand_cols, nexpand_cols);
+      summarum += rowc + colc;
+    }
+  }
+
+  printf("%llu\n", summarum);
+}
diff --git a/day11/uppgb.c b/day11/uppgb.c
@@ -0,0 +1,98 @@
+#include "common.h"
+
+static inline int is_expandable_row(size_t i, char **lines, size_t ncols) {
+  size_t j;
+  for (j = 0; j < ncols; j++) {
+    if (lines[i][j] != '.')
+      return 0;
+  }
+  return 1;
+}
+
+static inline int is_expandable_col(size_t i, char **lines, size_t nrows) {
+  size_t j;
+  for (j = 0; j < nrows; j++) {
+    if (lines[j][i] != '.')
+      return 0;
+  }
+  return 1;
+}
+
+static inline int isin(size_t i, size_t *lst, size_t nlst) {
+  size_t j;
+  for (j = 0; j < nlst; j++) {
+    if (lst[j] == i)
+      return 1;
+  }
+
+  return 0;
+}
+
+static inline uint64_t count_betw(size_t ca, size_t cb, size_t *lst,
+                                  size_t nlst) {
+  size_t mi = ca > cb ? cb : ca;
+  size_t ma = ca > cb ? ca : cb;
+
+  uint64_t count = 0;
+  size_t i;
+  for (i = mi; i < ma; i++) {
+    if (isin(i, lst, nlst)) {
+      count += 1000000;
+    } else {
+      count++;
+    }
+  }
+
+  return count;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t i, j;
+  size_t nrows = readlines(&lines, "input");
+  size_t ncols = strlen(lines[0]) - 1;
+
+  size_t expand_cols[2 * ncols];
+  size_t expand_rows[2 * nrows];
+  size_t nexpand_cols = 0;
+  size_t nexpand_rows = 0;
+
+  for (i = 0; i < nrows; i++) {
+    if (is_expandable_row(i, lines, ncols)) {
+      expand_rows[nexpand_rows] = i;
+      nexpand_rows++;
+    }
+  }
+
+  for (i = 0; i < ncols; i++) {
+    if (is_expandable_col(i, lines, nrows)) {
+      expand_cols[nexpand_cols] = i;
+      nexpand_cols++;
+    }
+  }
+
+  size_t galaxies[4 * ncols * nrows][2];
+  size_t ngalaxies = 0;
+  for (i = 0; i < nrows; i++) {
+    for (j = 0; j < ncols; j++) {
+      if (lines[i][j] == '#') {
+        galaxies[ngalaxies][0] = i;
+        galaxies[ngalaxies][1] = j;
+        ngalaxies++;
+      }
+    }
+  }
+
+  uint64_t summarum = 0;
+  for (i = 0; i < ngalaxies - 1; i++) {
+    for (j = i + 1; j < ngalaxies; j++) {
+      uint64_t rowc =
+          count_betw(galaxies[i][0], galaxies[j][0], expand_rows, nexpand_rows);
+      uint64_t colc =
+          count_betw(galaxies[i][1], galaxies[j][1], expand_cols, nexpand_cols);
+      summarum += rowc + colc;
+    }
+  }
+
+  printf("%llu\n", summarum);
+}
diff --git a/day12/Makefile b/day12/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o ../utils/stack_u64.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day12/common.c b/day12/common.c
@@ -0,0 +1,3 @@
+#include "common.h"
+
+size_t fn(char **lines, size_t nlines) { return 0; }
diff --git a/day12/common.h b/day12/common.h
@@ -0,0 +1,14 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <reading.h>
+#include <stack_u64.h>
+
+size_t fn(char **lines, size_t nlines);
+
+#endif
diff --git a/day12/exinput b/day12/exinput
@@ -0,0 +1,6 @@
+???.### 1,1,3
+.??..??...?##. 1,1,3
+?#?#?#?#?#?#?#? 1,3,1,6
+????.#...#... 4,1,1
+????.######..#####. 1,6,5
+?###???????? 3,2,1
diff --git a/day12/input b/day12/input
@@ -0,0 +1,1000 @@
+..???#??.?????? 4,3
+##??#??#?..??? 9,1,1
+.?##?#?????..? 5,1,1,1
+???#?##??? 4,4
+?.??#?????#???? 8,1
+.?#?.???##??##? 3,6
+??????#??? 3,2
+?##??##???.??.?#? 3,4,1,2,2
+#..#?#?.?????#.# 1,1,2,5,1
+#???.###???? 1,2,3,2
+???????#??????##. 1,3,2,1,2
+?..??????? 1,1,2
+.#????#??##?? 3,6
+.???##???. 2,4
+???.##??.#????#?.? 3,2,1,2,1,2
+.???????##??.???? 8,3
+#??????#????.?.. 1,1,5,1
+??????#??#?.?# 2,2,2,1
+.....??#??.?.???? 2,1
+?????.#?#?#??..?? 1,1,4,1
+.#?.?????? 2,2
+???#??.??????? 1,3,4
+?#??????#???..??.?#? 10,1,1
+???????.??. 2,2
+?????##??#?? 1,6
+?????#?##?????#? 1,1,6,1,2
+???#??????.? 5,1,1,1
+??#.?##?.#??#??.?.## 2,2,5,2
+??#?#??#?#.?.??.?.# 7,1,1,1,1,1
+.#??##????#??????#? 12,5
+?##???#?#??????. 4,6
+.?.??????????#????#? 1,1,2,7,2
+.?????????#.???????? 1,3,2,8
+??#?.?.?????? 3,1,2
+.????##????.??????? 7,2,1
+????#??.?????????? 2,4,2,1
+???.????#?#???. 2,1,1,2,1
+.#???.???##?????##?# 4,14
+??.?.?#??## 1,1,6
+#.#??#?????##??##?? 1,1,1,1,9
+.#.##????.#?#??#?. 1,5,1,4
+.???????## 1,2,2
+?.????.??.?. 3,1
+????.#?#?#.?#? 2,1,5,1
+????####??##??????? 2,14
+???????#??? 2,7
+#??.#?#?##??. 2,1,6
+???#?#???????#???? 2,9,3
+##???#???#????..# 3,3,1,1,1
+.?.????.?..??#???# 2,1,1,1,1,2
+?????.?????#??. 2,1,1,2,1
+?????.???? 3,1
+?????###?????..?? 1,8,1,1
+.?.??????#?.? 1,1,4,1
+?#?.??????#??# 2,6,1
+?.??..??#?..??#????? 3,2
+???#??????? 1,4,2
+#?.?#????#?? 1,4,2,1
+?.#?????.??#. 3,1,1
+#?..?#???##??#?????? 2,13
+????????.. 1,1,1
+?###??#????#?.#??# 6,3,1,1
+???.??#????##?#?#?? 2,2,7
+????????????.??# 1,4,1,3
+????##?..#. 2,3,1
+?.?#.?.??.#.#??? 2,1,1,3
+??#??#???.#??##?? 1,1,1,6
+???#?##?##?.??#??#. 2,1,6,5
+????#???#??.??#?. 1,5,1,1,2
+??.?..???????.?? 1,7
+?#???#?.????#? 4,1,1,2
+.?##???.????.? 4,2
+.#????.?????#??? 1,2,6,2
+?.???#???#.?#? 3,1,1,2
+???.????#? 1,3
+#.#??#??.?#.# 1,6,1,1
+.#??.????#?# 2,1,3
+??.?.##??#?#?????#? 2,1,5,2,1,2
+.?????.#??? 2,3
+???.?.??????????? 2,1,3,2
+????????????????? 2,2,6
+##.?#?#????.# 2,6,1
+??.?????????#?? 1,4
+?????????.??????? 5,1,1,1,1
+?#?????##?#????###. 2,2,4,5
+???.???????????? 1,1,1,4,4
+????..?.?????..#??.. 1,2,1
+?#?#????.??.????? 4,2,2,1,3
+.#??.?#.?#.#???#?.? 3,2,1,3,2,1
+.????#?#????#.#?.. 10,1
+#.??#??#?? 1,2,2
+?.?.??#??? 1,3
+??????#.??.? 6,1
+???.#.?????#?###? 2,1,9
+???##????# 6,2
+?#.????##?.??.????? 2,7,1,4
+?????.?#??.? 1,1,1,1
+?#???...?? 4,2
+?????.???#?? 2,1,1,3
+?#??.?.?.#?????. 4,1,2,3
+?#..?.?????#.? 1,1,2,2
+?????###????#? 1,6,1
+?.?#???#?#???.???. 1,3,6,1,1
+.????#?##????#?#.?? 1,3,3,5,1
+#???#.???# 2,1,2
+.?#???#???????.#??# 1,1,2,3,1,4
+.??.??.?##???#?##. 1,1,9
+?####.???? 4,4
+?#??##????#.?#? 9,1,1
+?#?..?#.##?#.?.?#? 1,1,2,1,1,2
+????????.#?. 1,4,1
+????#???#??#.?#.? 1,2,1,4,1
+?#?###????##?#??.# 15,1
+?#?#?.#???? 3,4
+..##???##??? 2,5
+???..??##.???#???? 3,2,1,1,1
+#.??????..???????? 1,2,2,2,1
+?????#????? 2,3,1
+.????..##????#? 1,1,7
+?.??????.??? 4,1
+????#?????...??..?. 1,1
+?.?.?##???#????.?#? 10,2
+??#???.??##?#??.??. 3,4,2,2
+?####?###?#??#.????? 11,1,1,1
+??..?????? 1,1,1
+?#???#?#?.??#? 2,4,2
+..????#?.??. 2,2,1
+?.?#??.??#????##?? 2,9
+???..????. 1,1,1
+??.??#.#.??.???#??? 1,1,1,1,1,7
+???????????#??? 2,1,6
+.?#??????? 2,1,1
+?#.??????#???????#? 1,10,1,1
+??#?????.?.???? 5,4
+#?.#???#??.??.## 1,1,2,1,2
+??????#??#??.# 1,2,6,1
+.?#?.?????????#???? 3,4,1,1,1
+..?.???#???.?? 1,1,1,1
+?#?#????#.??.?? 2,6,1
+??#??#??#? 2,5
+..??#??##?#?.? 3,4
+.???###?.#??#????. 4,6
+.??.#.?.#??? 1,1,1,1
+?#??##?##???#???.?## 2,12,3
+.#?????.???..?? 1,1,1,1,2
+?#?##???#?????#? 4,3,1,3
+?????.?####??.? 3,5,1
+????.??#?#?# 3,1,5
+???.##??#??# 1,8
+??.?#?##????#?.?# 1,1,4,2,1
+.?#????..?#? 4,2
+.#.????????? 1,2,2
+??#????.??#.??????? 4,3,7
+????#?#??.????#?? 5,5
+?#.???#???#..?##?# 2,6,1,5
+.?#?????????.??##??? 1,4,3,6
+.???#??#??# 1,5,1
+????.????###???#?#? 1,1,1,5,2,1
+???????#?#??##?. 1,1,10
+????#?..?????.? 4,1
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+??###???#.?. 3,1,1
+????#??.?#??##?#?# 1,1,1,10
+###??#???.?#???### 4,1,1,8
+#?.?????#??#?#?#? 1,13
+#.???.?.??#??#? 1,2,1,1,5
+?????#.???#??#?#... 5,3,4
+?#?#??#???.???#???? 4,3,1
+#???#??##??###?.?.# 5,8,1
+??????.????#???#?#.? 3,5,1,1,1
+??##?.?#?#. 4,1,1
+#??#.?????###? 4,1,5
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+?#?#?.?#????? 1,2,1,3
+.?????.##???#?.???? 4,7,1
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+?????#??#???.??# 5,3,1,1,1
+#?????????#??????.?# 1,1,1,7,1,1
+.???##???.???#??. 7,3
+#???#?????.??? 1,3,2,2
+????.??????? 1,2,2,2
+?.??????.??. 1,3,1
+???#?#????.??#? 6,3
+??????##?#?#?#????#? 1,1,1,6,6
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+.???.#??#? 1,2,2
+???????????? 2,2,1
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+.#????.?.?????? 4,1
+#???#?????????.??# 9,1,1,1,1
+.???###?.????#??#??? 4,7
+?????.??????#.???? 1,6,1
+.??????#??????.???# 1,2,3,1,1,1
+?#?????.????.?????? 1,2,1,1,3,1
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+.???#?..#?#??. 5,3
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+.????.??#?????.??. 3,6,1
+?????#?.??##? 3,1,5
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+??.????.?.???? 2,2,1,1
+.????.?.?? 3,2
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+.???.?????.??? 1,4,2
+???.??#??????? 1,4,1,1
+?#.#..?##?????? 1,1,7,1
+?#???##??????? 1,8
+?..??#.????? 1,3,5
+??#??#..#???? 4,3
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+.?????????. 3,4
+???#??????????.#??? 1,9,1,2,1
+?.#?...?.?????.??#? 1,2,1,3,1,1
+.???#?.????#?? 3,5
+????.??.??.# 1,1,1,1
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+???????????.#????? 7,2,1,1
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+??#??????#??#?#?# 7,2,1,1,1
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+.???#?.?.??#?.#???? 2,3,3
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+???.#.?.#?.?.??#?.. 1,2,2
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+.#??##???#??#??? 1,9,1
+.???.?#??????. 1,1,3
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+??#???#????????.???# 1,6,1,4,1,1
+?????#?#?.???. 6,2
+.?????#?##??.????#? 10,6
+.???#??#??#?.#?. 10,1
+?#?.?##????? 1,4,2
+???..??#??#?.. 3,3,2
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+?..?#####.??#? 6,3
+.#.?#???#???????.??? 1,9,1,2
+??#.?.????.? 3,1,1,1
+??.?#??????????#?? 4,5
+??.#??.????? 1,1,2,1
+?.#??##?###.???. 1,1,7,1,1
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+???????.??#??.?.? 2,1,3,1,1
+.??#???#.??#??? 3,2,5
+??????.#.???#????? 2,1,8
+.????##?#?.##????? 8,4,1
+.???#?.#?#.?? 4,1,1,1
+???????#??.???.??#.. 4,2,1,1,1,1
+#?#?#???.??.?#???#?? 1,1,1,1,1,8
+.????..??. 4,1
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+?.#??#????##?#??.??? 5,2,1,1,1
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+.?????##???.?..?#??? 9,2
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+.??#?##??????..#?#. 3,4,1,1,1,1
+...?#??.?.#??????##? 2,1,10
+????##?.#?#? 1,3,1,1
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+.?#??#???.?.??#??#?. 5,1,1,1,3
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+.?#?.??#??.????#?? 2,5,7
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+.????.?.?????###???? 3,1,12
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+#?##.????#?? 1,2,1,3
+.??#?#?.?????? 5,5
+..?????????????.???. 12,1
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+.??????###?#?? 1,9
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+????????.???# 1,3,1,2
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+#..??#..??.???#?? 1,3,2,1,3
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+#.#?.?#??.?????# 1,1,4,1,3
+..?#??.??#?.?##???. 4,1,5
+#?##???.?#????..?. 6,6,1
+.#????#?#??? 1,2,1
+.#??#.#?????#?#??? 4,10,1
+##??.???.#?#?#? 4,1,1,1,1
+?.???.????#? 1,2,2,2
+??#??.??.? 4,1
+??#?????????.??.??. 4,1,1,1,2,1
+????#?.??? 2,2,2
+.??#.#?#?????????# 2,5,1,3
+##?????????? 2,1,3
+?.?????????#??#??. 2,1,7
+??????.??? 5,1
+???????#?..#?#?? 2,1,2,3
+.??#..?#??.??? 1,1,4
+?##.??#???#????#??? 2,1,1,4,3,1
+??#?????#????? 4,3,1
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+???.????????.? 1,6,1
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+.?.##??#??#?????? 8,3
+?.?.??#??. 1,1,3
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+?.#??.?##?.?? 2,4
+#####?????#.???? 6,2,2
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+?#.#?##?#???? 1,7,1
+?????????###?###.? 5,8
+?##?.?.?#???? 3,2,1
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+?????????#?#????? 1,1,10
+?#.??.??##???.?#.? 1,4,2
+#?????##???#?.#??# 1,10,1,1
+?????????#???#??##. 1,1,1,1,7,2
+??.?#?..?? 2,1
+???#..?.??####?##??? 1,11
+?.?#????????? 1,1,2,4
+???#???.#??? 6,3
+..?????#.? 1,1,1
+?.??#?????? 1,8
+?#????????????? 4,1,4,1
+??.??##????????.???# 8,1,1
+#??.??????? 3,1,1
+????.????????????. 2,3,1,1,1
+??????#??#?. 1,4
+.?#.???.????? 2,2,4
+..???#?#??# 5,1
+..?????.?.?#?#?. 4,4
+.#?.???????.? 2,5
+#??????#??#?#?.#?. 1,3,1,2,2,1
+???..???##?????#?? 1,10
+?????..??????#?????# 1,1,1,2,3,3
+??#??##??? 7,1
+????.#?????#?#? 1,2,5
+??..??.?#? 1,3
+?????.?.???#?? 2,1,1,1
+?.#?#?#.???#?. 3,1,2
+#??.????#.?#? 1,3,1,1
+.?#?#???#?? 3,2
+.??##????#??#?? 12,1
+#??#??????? 6,3
+#?##.??#??#? 4,3,1
+#?????.???.????#??? 2,2,5
+???????.?.?..???.#? 3,1,1,1,1,2
+#?#?#.###???#?.??? 1,3,3,1,2,2
+.???##.??#?. 4,2
+??????????? 1,5
+??#.???????#?#????# 1,1,11
+???#?.??#?.???#?? 1,3,1,2,5
+?????#??????.???#?? 3,3
+??#?###????##..?? 13,2
+..?##???????#??..? 4,1,6,1
+.??????????#?. 1,3,1,1
+???????#?. 2,3
+???#.#..???? 2,1,2
+?.????.????#?? 1,1,1,5
+?#.????#??????? 1,7
+????#??????.?.?.# 1,6,1,1,1
+??.#.??#..?? 1,1,1,1
+??#????????.? 4,3
+????.?###??? 2,5
+#####??.#?.? 6,2
+?#..#??#???????? 1,1,6,1
+???#?#???##?.?#?.? 2,4,4,3
+??##??##?????#?? 9,4
+#????.#.#..?? 3,1,1,1
diff --git a/day12/uppga.c b/day12/uppga.c
@@ -0,0 +1,236 @@
+#include "common.h"
+
+static inline void read_stack(stack_u64 *s, char *line) {
+  char *cp = line;
+  uint64_t t;
+
+  while ((cp = sread_next_u64(&t, cp)) != NULL) {
+    stack_u64_push(s, t);
+  }
+}
+
+static inline size_t patlen(char *line) {
+  size_t c = 0;
+  while (line[c] == '.' || line[c] == '#' || line[c] == '?')
+    c++;
+  return c;
+}
+
+/**
+ * Check if it is possible for pattern in string s of length
+ * n to end with exactly a '#'s.
+ */
+static inline int can_end_with(int a, char *s, size_t n) {
+  if (a > (int)n)
+    return 0;
+
+  if (a == 0) {
+    if (n == 0 || s[n - 1] == '.' || s[n - 1] == '?')
+      return 1;
+    return 0;
+  }
+
+  if (s[n - 1] != '?' && s[n - 1] != '#')
+    return 0;
+
+  assert(a > 0);
+
+  return can_end_with(a - 1, s, n - 1);
+}
+
+/**
+ * Check if it is possible for pattern in string s of length
+ * n to begin with exactly a '#'s.
+ */
+static inline int can_beg_with(int a, char *s, size_t n) {
+  if (a > (int)n)
+    return 0;
+
+  if (a == 0) {
+    if (n == 0 || s[0] == '.' || s[0] == '?')
+      return 1;
+    return 0;
+  }
+
+  if (s[0] != '?' && s[0] != '#')
+    return 0;
+
+  assert(a > 0);
+
+  return can_beg_with(a - 1, &s[1], n - 1);
+}
+
+static uint64_t counter(char *t, size_t l, uint64_t *s, size_t n) {
+  size_t i;
+  uint64_t r = UINT64_MAX;
+
+  if (n == 0) {
+    if (l == 0) {
+      r = 1;
+      goto endit;
+    } else {
+      for (i = 0; i < l; i++) {
+        if (t[i] != '.' && t[i] != '?') {
+          r = 0;
+          goto endit;
+        }
+      }
+      r = 1;
+      goto endit;
+    }
+  }
+
+  if (l < 2) {
+    if (l == 0) {
+      assert(n != 0);
+      r = 0;
+      goto endit;
+    } else {
+      assert(l == 1);
+      switch (t[0]) {
+      case '#':
+        if (n == 1 && s[0] == 1) {
+          r = 1;
+          goto endit;
+        } else {
+          r = 0;
+          goto endit;
+        }
+        break;
+      case '.':
+        assert(n != 0);
+        r = 0;
+        goto endit;
+        break;
+      case '?':
+        assert(n != 0);
+        t[0] = '.';
+        r = counter(t, l, s, n);
+        t[0] = '#';
+        r += counter(t, l, s, n);
+        t[0] = '?';
+        goto endit;
+        break;
+      default:
+        assert(t[0] == '#' || t[0] == '.' || t[0] == '?');
+      }
+    }
+  }
+
+  size_t centrum = (l >> 1);
+  int k, a, b;
+  uint64_t left, right;
+  r = 0;
+  switch (t[centrum]) {
+  case '?':
+    t[centrum] = '.';
+    r += counter(t, l, s, n);
+    t[centrum] = '#';
+    r += counter(t, l, s, n);
+    t[centrum] = '?'; // prolly not needed
+    goto endit;
+    break;
+  case '.':
+    for (k = 0; k <= (int)n; k++) {
+      left = counter(t, centrum, s, k);
+      if (left != 0) {
+        r += left * counter(&t[centrum + 1], l - (centrum + 1), &s[k], n - k);
+      }
+    }
+    goto endit;
+    break;
+  case '#':
+    /* DEBUG
+    printf("---> bradgard (l = %zu, n = %zu)\n", l, n);
+    */
+    for (k = 0; k < (int)n; k++) {
+      // a + b == s[k]-1
+      for (a = 0; a < (int)s[k]; a++) {
+        b = s[k] - 1 - a;
+
+        /* DEBUG
+        printf(">> a = %d, b = %d (KAA = %d, ELL = %zu) \n", a, b, k, l);
+        int cew = can_end_with(a, t, centrum);
+        int cbw = can_beg_with(b, &t[centrum+1], l-(centrum+1));
+        printf(">> cew = %d, cbw = %d\n", cew, cbw);
+        */
+
+        if (can_end_with(a, t, centrum) &&
+            can_beg_with(b, &t[centrum + 1], l - (centrum + 1))) {
+          if (a < (int)centrum) {
+            left = counter(t, centrum - (a + 1), s, k);
+          } else {
+            assert(a == (int)centrum);
+            left = counter(t, 0, s, k);
+          }
+
+          if (left != 0) {
+            if (b < (int)(l - (centrum + 1))) {
+              right =
+                  counter(&t[centrum + 1 + b + 1], l - (centrum + 1 + b + 1),
+                          &s[k + 1], n - (k + 1));
+            } else {
+              assert(b == (int)(l - (centrum + 1)));
+              right =
+                  counter(&t[centrum + 1 + b + 1], 0, &s[k + 1], n - (k + 1));
+            }
+          }
+
+          r += left * right;
+        }
+      }
+    }
+    goto endit;
+    break;
+  default:
+    assert(t[centrum] == '?' || t[centrum] == '.' || t[centrum] == '#');
+  }
+
+endit:
+  /* DEBUG
+  for(i = 0; i < l; i++) {
+    printf("%c", t[i]);
+  }
+  if(centrum < l) {
+    printf(" <%zu, %zu> ", centrum, l);
+  }
+  printf(" [");
+  for(i = 0; i < n; i++) {
+    printf(" %llu", s[i]);
+  }
+  printf("]");
+  printf(" -> %llu\n", r);
+  */
+  return r;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+  printf("#lines: %zu\n", nlines);
+
+  size_t i;
+  stack_u64 tmp;
+  stack_u64_init(&tmp);
+  uint64_t summa = 0;
+  for (i = 0; i < nlines; i++) {
+    //  for(i = 0; i < 1; i++) {
+    while (tmp.nmemb > 0)
+      stack_u64_pop(&tmp);
+
+    size_t l = patlen(lines[i]);
+    read_stack(&tmp, lines[i]);
+
+    uint64_t cs = counter(lines[i], l, tmp.data, tmp.nmemb);
+    printf("RESULT = %llu\n", cs);
+    summa += cs;
+  }
+
+  /**
+   * Todo: Optimize by having second branch to be conditional
+   * on the result of the first when product is to be
+   * calculated.
+   */
+
+  printf("%llu\n", summa);
+}
diff --git a/day12/uppgb.c b/day12/uppgb.c
@@ -0,0 +1,288 @@
+#include "common.h"
+
+static inline void read_stack(stack_u64 *s, char *line) {
+  char *cp = line;
+  uint64_t t;
+
+  while ((cp = sread_next_u64(&t, cp)) != NULL) {
+    stack_u64_push(s, t);
+  }
+}
+
+static inline size_t patlen(char *line) {
+  size_t c = 0;
+  while (line[c] == '.' || line[c] == '#' || line[c] == '?')
+    c++;
+  return c;
+}
+
+/**
+ * Check if it is possible for pattern in string s of length
+ * n to end with exactly a '#'s.
+ */
+static inline int can_end_with(int a, char *s, size_t n) {
+  if (a > (int)n)
+    return 0;
+
+  if (a == 0) {
+    if (n == 0 || s[n - 1] == '.' || s[n - 1] == '?')
+      return 1;
+    return 0;
+  }
+
+  if (s[n - 1] != '?' && s[n - 1] != '#')
+    return 0;
+
+  assert(a > 0);
+
+  return can_end_with(a - 1, s, n - 1);
+}
+
+/**
+ * Check if it is possible for pattern in string s of length
+ * n to begin with exactly a '#'s.
+ */
+static inline int can_beg_with(int a, char *s, size_t n) {
+  if (a > (int)n)
+    return 0;
+
+  if (a == 0) {
+    if (n == 0 || s[0] == '.' || s[0] == '?')
+      return 1;
+    return 0;
+  }
+
+  if (s[0] != '?' && s[0] != '#')
+    return 0;
+
+  assert(a > 0);
+
+  return can_beg_with(a - 1, &s[1], n - 1);
+}
+
+static uint64_t counter(char *t, size_t l, uint64_t *s, size_t n) {
+  size_t i;
+  uint64_t r = UINT64_MAX;
+
+  if (n == 0) {
+    if (l == 0) {
+      r = 1;
+      goto endit;
+    } else {
+      for (i = 0; i < l; i++) {
+        if (t[i] != '.' && t[i] != '?') {
+          r = 0;
+          goto endit;
+        }
+      }
+      r = 1;
+      goto endit;
+    }
+  }
+
+  if (l < 2) {
+    if (l == 0) {
+      assert(n != 0);
+      r = 0;
+      goto endit;
+    } else {
+      assert(l == 1);
+      switch (t[0]) {
+      case '#':
+        if (n == 1 && s[0] == 1) {
+          r = 1;
+          goto endit;
+        } else {
+          r = 0;
+          goto endit;
+        }
+        break;
+      case '.':
+        assert(n != 0);
+        r = 0;
+        goto endit;
+        break;
+      case '?':
+        assert(n != 0);
+        t[0] = '.';
+        r = counter(t, l, s, n);
+        t[0] = '#';
+        r += counter(t, l, s, n);
+        t[0] = '?';
+        goto endit;
+        break;
+      default:
+        assert(t[0] == '#' || t[0] == '.' || t[0] == '?');
+      }
+    }
+  }
+
+  size_t centrum = (l >> 1);
+  int k, a, b;
+  uint64_t left, right;
+  r = 0;
+  switch (t[centrum]) {
+  case '?':
+    t[centrum] = '.';
+    r += counter(t, l, s, n);
+    t[centrum] = '#';
+    r += counter(t, l, s, n);
+    t[centrum] = '?'; // prolly not needed
+    goto endit;
+    break;
+  case '.':
+    for (k = 0; k <= (int)n; k++) {
+      left = counter(t, centrum, s, k);
+      if (left != 0) {
+        r += left * counter(&t[centrum + 1], l - (centrum + 1), &s[k], n - k);
+      }
+    }
+    goto endit;
+    break;
+  case '#':
+    /* DEBUG
+    printf("---> bradgard (l = %zu, n = %zu)\n", l, n);
+    */
+    for (k = 0; k < (int)n; k++) {
+      // a + b == s[k]-1
+      for (a = 0; a < (int)s[k]; a++) {
+        b = s[k] - 1 - a;
+
+        /* DEBUG
+        printf(">> a = %d, b = %d (KAA = %d, ELL = %zu) \n", a, b, k, l);
+        int cew = can_end_with(a, t, centrum);
+        int cbw = can_beg_with(b, &t[centrum+1], l-(centrum+1));
+        printf(">> cew = %d, cbw = %d\n", cew, cbw);
+        */
+
+        if (can_end_with(a, t, centrum) &&
+            can_beg_with(b, &t[centrum + 1], l - (centrum + 1))) {
+          if (a < (int)centrum) {
+            left = counter(t, centrum - (a + 1), s, k);
+          } else {
+            assert(a == (int)centrum);
+            left = counter(t, 0, s, k);
+          }
+
+          if (left != 0) {
+            if (b < (int)(l - (centrum + 1))) {
+              right =
+                  counter(&t[centrum + 1 + b + 1], l - (centrum + 1 + b + 1),
+                          &s[k + 1], n - (k + 1));
+            } else {
+              assert(b == (int)(l - (centrum + 1)));
+              right =
+                  counter(&t[centrum + 1 + b + 1], 0, &s[k + 1], n - (k + 1));
+            }
+          }
+
+          r += left * right;
+        }
+      }
+    }
+    goto endit;
+    break;
+  default:
+    assert(t[centrum] == '?' || t[centrum] == '.' || t[centrum] == '#');
+  }
+
+endit:
+  /* DEBUG
+  for(i = 0; i < l; i++) {
+    printf("%c", t[i]);
+  }
+  if(centrum < l) {
+    printf(" <%zu, %zu> ", centrum, l);
+  }
+  printf(" [");
+  for(i = 0; i < n; i++) {
+    printf(" %llu", s[i]);
+  }
+  printf("]");
+  printf(" -> %llu\n", r);
+  */
+  return r;
+}
+
+static inline void linear_remake(char *out, char *in) {
+  size_t i;
+  char *co = out;
+  char *ci = in;
+
+  // five times until space
+  for (i = 0; i < 5; i++) {
+    while (*ci != ' ') {
+      *co = *ci;
+      co++;
+      ci++;
+    }
+    // add extra ?
+    if (i < 4) {
+      *co = '?';
+      co++;
+    }
+    ci = in;
+  }
+
+  // go to space
+  while (*ci != ' ')
+    ci++;
+
+  in = ci + 1;
+
+  // five times numbers
+  for (i = 0; i < 5; i++) {
+    while (*ci != '\n' && *ci != '\0') {
+      *co = *ci;
+      co++;
+      ci++;
+    }
+    if (i < 4) {
+      *co = ',';
+      co++;
+    }
+    ci = in;
+  }
+
+  // newline null
+  *co = '\n';
+  co++;
+  *co = '\0';
+  co++;
+}
+int main(int argc, char **argv) {
+  char **lines;
+  size_t i;
+  size_t nlines = readlines(&lines, "input");
+  printf("#lines: %zu\n", nlines);
+
+  char linez[nlines][512];
+  for (i = 0; i < nlines; i++) {
+    linear_remake(linez[i], lines[i]);
+    printf("%s", linez[i]);
+  }
+
+  stack_u64 tmp;
+  stack_u64_init(&tmp);
+  uint64_t summa = 0;
+  for (i = 0; i < nlines; i++) {
+    //  for(i = 0; i < 1; i++) {
+    while (tmp.nmemb > 0)
+      stack_u64_pop(&tmp);
+
+    size_t l = patlen(linez[i]);
+    read_stack(&tmp, linez[i]);
+
+    uint64_t cs = counter(linez[i], l, tmp.data, tmp.nmemb);
+    printf("RESULT = %llu\n", cs);
+    summa += cs;
+  }
+
+  /**
+   * Todo: Optimize by having second branch to be conditional
+   * on the result of the first when product is to be
+   * calculated.
+   */
+
+  printf("%llu\n", summa);
+}
diff --git a/day13/Makefile b/day13/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day13/common.c b/day13/common.c
@@ -0,0 +1,3 @@
+#include "common.h"
+
+size_t fn(char **lines, size_t nlines) { return 0; }
diff --git a/day13/common.h b/day13/common.h
@@ -0,0 +1,13 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <reading.h>
+
+size_t fn(char **lines, size_t nlines);
+
+#endif
diff --git a/day13/exinput b/day13/exinput
@@ -0,0 +1,15 @@
+#.##..##.
+..#.##.#.
+##......#
+##......#
+..#.##.#.
+..##..##.
+#.#.##.#.
+
+#...##..#
+#....#..#
+..##..###
+#####.##.
+#####.##.
+..##..###
+#....#..#
diff --git a/day13/input b/day13/input
@@ -0,0 +1,1387 @@
+.####.#...##.#.
+...###.##.#.#..
+...###.##.#.#..
+.####.#...#..#.
+..##......#..#.
+#.#...#.##...##
+.#.#.#..##..##.
+#..##...#####.#
+.#.#.#.#..##.#.
+.....###.#.#..#
+.....###.#.#..#
+
+.#.###.....
+#..#.##...#
+.#.....#.#.
+.#.....#.#.
+#..#.##...#
+.#.###.....
+##.#..##.##
+#....##..#.
+.##.##.#.##
+...#..###.#
+...#..###.#
+.##.##.#.##
+#....##..#.
+####..##.##
+.#.###.....
+#..#.##...#
+.#.....#.#.
+
+###....##....
+####..#..#..#
+..###.####.##
+..#..######..
+...#.######.#
+#####.#.##.##
+##.#..#..#..#
+##....####...
+....#......#.
+.....#.##.#..
+##...##..##..
+...##.#..#.##
+##..###..###.
+
+.##.#...##.
+.#.########
+.##.#.#.##.
+#.##..#....
+####.##....
+####.##....
+#.##..#....
+.##.#.#.##.
+.#.########
+.##.#...##.
+..####.####
+.##.###.###
+.#..#.#.##.
+#.####..##.
+...#..#....
+
+.....##..#.
+.##..##.#.#
+#..#...####
+####.....##
+#..#.##....
+#####.....#
+#####.....#
+#..#.##....
+####.#...##
+#..#...####
+.##..##.#.#
+.....##..#.
+....##.##..
+
+#####..
+.##.#..
+.##....
+.##...#
+.##....
+#..####
+..#.#.#
+#####..
+#####.#
+.##...#
+.##.##.
+.##.##.
+.##...#
+
+.##.#.##.##.##.##
+.##.####....###..
+.##.#.#.#.##..##.
+#..#.#..#.#.##.#.
+....####...####..
+#..##.#...######.
+....#.#..........
+#..#.##.####..###
+#####...##......#
+....###..##.##.##
+####..###..####..
+.##..##..#.####.#
+#..##..##..#..#..
+.##..#.#.#..##..#
+####..####.####.#
+####.....###..###
+#..#..##.##.##.##
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diff --git a/day13/uppga.c b/day13/uppga.c
@@ -0,0 +1,90 @@
+#include "common.h"
+
+static inline size_t parse_next(uint64_t **rows, size_t *nrows, uint64_t **cols,
+                                size_t *ncols, char **lines, size_t nlines,
+                                size_t s) {
+  size_t i, j;
+  size_t nc = strlen(lines[s]) - 1;
+
+  // find number of rows
+  size_t nr = 0;
+  while (s + nr < nlines &&
+         (lines[s + nr][0] == '.' || lines[s + nr][0] == '#')) {
+    nr++;
+  }
+
+  // read rows
+  uint64_t *r = malloc(nr * sizeof(*r));
+  for (i = 0; i < nr; i++) {
+    // read row i
+    r[i] = 0;
+    for (j = 0; j < nc; j++) {
+      r[i] <<= 1;
+      if (lines[s + i][j] == '#') {
+        r[i] += 1;
+      }
+    }
+  }
+
+  // read cols
+  uint64_t *c = malloc(nc * sizeof(*r));
+  for (i = 0; i < nc; i++) {
+    c[i] = 0;
+    for (j = 0; j < nr; j++) {
+      c[i] <<= 1;
+      if (lines[s + j][i] == '#') {
+        c[i] += 1;
+      }
+    }
+  }
+
+  // output
+  *rows = r;
+  *cols = c;
+  *nrows = nr;
+  *ncols = nc;
+
+  return nr + 1;
+}
+
+static inline int is_refl(uint64_t *v, size_t nv, int i) {
+  int j = i + 1;
+
+  while (0 <= i && j < (int)nv) {
+    if (v[i] != v[j])
+      return 0;
+    i--;
+    j++;
+  }
+
+  return 1;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t i;
+  size_t nlines = readlines(&lines, "input");
+
+  size_t cr = 0;
+  uint64_t summa = 0;
+  uint64_t *rows, *cols;
+  size_t nrows, ncols;
+  while (cr < nlines) {
+    cr += parse_next(&rows, &nrows, &cols, &ncols, lines, nlines, cr);
+
+    for (i = 0; i < nrows - 1; i++) {
+      if (is_refl(rows, nrows, (int)i))
+        summa += 100 * (i + 1);
+    }
+
+    for (i = 0; i < ncols - 1; i++) {
+      if (is_refl(cols, ncols, (int)i))
+        summa += (i + 1);
+    }
+
+    free(rows);
+    free(cols);
+  }
+
+  printf("%llu\n", summa);
+}
diff --git a/day13/uppgb.c b/day13/uppgb.c
@@ -0,0 +1,112 @@
+#include "common.h"
+
+static inline size_t parse_next(uint64_t **rows, size_t *nrows, uint64_t **cols,
+                                size_t *ncols, char **lines, size_t nlines,
+                                size_t s) {
+  size_t i, j;
+  size_t nc = strlen(lines[s]) - 1;
+
+  // find number of rows
+  size_t nr = 0;
+  while (s + nr < nlines &&
+         (lines[s + nr][0] == '.' || lines[s + nr][0] == '#')) {
+    nr++;
+  }
+
+  // read rows
+  uint64_t *r = malloc(nr * sizeof(*r));
+  for (i = 0; i < nr; i++) {
+    // read row i
+    r[i] = 0;
+    for (j = 0; j < nc; j++) {
+      r[i] <<= 1;
+      if (lines[s + i][j] == '#') {
+        r[i] += 1;
+      }
+    }
+  }
+
+  // read cols
+  uint64_t *c = malloc(nc * sizeof(*r));
+  for (i = 0; i < nc; i++) {
+    c[i] = 0;
+    for (j = 0; j < nr; j++) {
+      c[i] <<= 1;
+      if (lines[s + j][i] == '#') {
+        c[i] += 1;
+      }
+    }
+  }
+
+  // output
+  *rows = r;
+  *cols = c;
+  *nrows = nr;
+  *ncols = nc;
+
+  return nr + 1;
+}
+
+/**
+ * Checks if n is a _positive_ power of 2.
+ */
+static inline int is_power2(const uint64_t n) {
+  uint64_t t;
+
+  __asm__ volatile("POPCNT %1, %0;" : "=r"(t) : "r"(n) :);
+
+  return t == 1;
+}
+
+static inline int is_refl(uint64_t *v, size_t nv, int i) {
+  int j = i + 1;
+
+  size_t smuts = 0;
+  while (0 <= i && j < (int)nv) {
+    if (v[i] != v[j]) {
+      if (!is_power2(v[i] ^ v[j]))
+        return 0;
+      if (smuts > 0)
+        return 0;
+
+      smuts++;
+    }
+
+    i--;
+    j++;
+  }
+
+  if (smuts == 0)
+    return 0;
+
+  return 1;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t i;
+  size_t nlines = readlines(&lines, "input");
+
+  size_t cr = 0;
+  uint64_t summa = 0;
+  uint64_t *rows, *cols;
+  size_t nrows, ncols;
+  while (cr < nlines) {
+    cr += parse_next(&rows, &nrows, &cols, &ncols, lines, nlines, cr);
+
+    for (i = 0; i < nrows - 1; i++) {
+      if (is_refl(rows, nrows, (int)i))
+        summa += 100 * (i + 1);
+    }
+
+    for (i = 0; i < ncols - 1; i++) {
+      if (is_refl(cols, ncols, (int)i))
+        summa += (i + 1);
+    }
+
+    free(rows);
+    free(cols);
+  }
+
+  printf("%llu\n", summa);
+}
diff --git a/day14/Makefile b/day14/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day14/common.c b/day14/common.c
@@ -0,0 +1,14 @@
+#include "common.h"
+
+uint64_t load(char **grid, size_t nr, size_t nc) {
+  uint64_t i, j;
+  uint64_t r = 0;
+  for (i = 0; i < nr; i++) {
+    for (j = 0; j < nc; j++) {
+      if (grid[i][j] == 'O')
+        r += (nr - i);
+    }
+  }
+
+  return r;
+}
diff --git a/day14/common.h b/day14/common.h
@@ -0,0 +1,13 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <reading.h>
+
+uint64_t load(char **grid, size_t nr, size_t nc);
+
+#endif
diff --git a/day14/exinput b/day14/exinput
@@ -0,0 +1,10 @@
+O....#....
+O.OO#....#
+.....##...
+OO.#O....O
+.O.....O#.
+O.#..O.#.#
+..O..#O..O
+.......O..
+#....###..
+#OO..#....
diff --git a/day14/input b/day14/input
@@ -0,0 +1,100 @@
+.OO.#.....#..O.O.O#....O....#....O....#..##.#...#..O....#.....O...##O...O#.O.#O.O....O......O.....OO
+.......#........O...O..#.....O....O.#..#O#.#.##O.#O.#..O.O....O.###O.........#.O.O......O....#O.....
+O..O.OOO....#O..#.#......OOO.#O#O.OO..#.O#.O.....O....#O.O####...##O..O....O#..O#...#..#......O..#..
+.#.#.##...#.O.#...O##..O....#........#..#.#.O...O.......#.OO...#........#...O#.#.......O..OO.OO.OO##
+....O.O.O#.....O#.OO..O...........O.OO..#.........O...O........#.OOOO..##.#....#.#..O..O#..O#.#O..OO
+#.#...O##.##...#.#O.OO..O.##O.#.##O...#O#....#OOOO.O........#......O.....O#....O....O..O#.OO#.O.....
+......O..O.O...O...#..OOO##...O.OO....#......OO.#.....OOO##..##.#.#..#OOO.......#O.#....O....O...#.#
+O..........OOO#.O.O.#.....OO...O.#..#...OO....OO#O.#OOO..OO..#.OO.....#O##.O..#.OOO...#.#O#...#.OO..
+....O..#O...........#.O..OO##....#..................O....O.O.O.#.O.......O.O.#.....O..#O..#..#......
+....##OO.#.....#OO...O......O#.....O.OO#....O..O.###.##.OO.#O....#.OO#O#.O......##O#..O...O#.#.O..O.
+#....OO.##...#.....O.O....#O.O#...OO#..#.O.O.#..O......###.O..O......#..........O...#.O.#O#OO..O.O.#
+........#....O..O###.#.#...OO##.#.....#O.O..........#...O..O...OO##....O#..O.#O......#..O..O...#..O#
+..O.#..O......#......O..#......#...O.#O...O...O.#..#.OO.O.O...O...O.O.#....#O...O#..##..O..O......O.
+...OO.............O....#O.O..O...OOO....O..#...O....#..#.O#.#..OO..#......O.....OOO....O..##..O#....
+O.#O#.#O#.#..#.O.#....#..O...#..O#O..#.#.O..O...OO.....O...O....#.O.#OO.OOO#.O.....O..O#.O..#.OO##..
+.....#..#.O.O##O.#O..O..OO.#O..O....O..O.....O..#.##..O.............#......O...###...O.....O....#...
+O...O..O#O..#O.#O.O#.O...#O#.......O.......#...O.#.#.O#.......O.#.OO.O.#O..O..........O#...O.OO..#..
+..O.O#.O.....O.OO..O#O...#.#....#..O.OO.....O.........O.O#...#....##......OO............O.O......#..
+...O#OO.....OOO.........#OOO.O.......O.....O....O....#OO##.O##...#.................O....#O...#......
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+O...#.......O##.OO...#O..#......O.......O..#.....#..#.#..OO....#.#.#O..OO..#.OO.#..##OO#.O#OO..#...#
+...O...#...O.#O....#.......O..OO.O..O.......O.#....#O..#O#.#...#....#.#....#....O.O......O.O........
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+.O.#O.....#...#...O.OOO#...O#..##O#OO##.#.#...O#.....#O..O#..#OO....#O...O.#..O..#.....#.#.OO...O.#.
+..#..OO......#..O..#.O.O..O.#...#.#....#.......O.#O#....O.#.O#.O.O.O..O.###O.OOO...#O....O#..O.#...#
+....O.#.....#.....OO.......O#O.O..OO#..O.O...OOOO....OO..O.#..O.....OOO.O#O.O......#..#O.O....O.#..O
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+....O..O.O...OO#O..O..........OO#...O..O.O#...#O......#.#.#...#..O.....O..O.#O#.....O.#O.O..O#.....O
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+.O.....#.#....O.O...#O..O###...O..#...#O#.O.O...........#.O....#O.OO......O....O..OO....#....#..##O#
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+....OO.#....O..O...OO..#O..#...###..OO.......O##.##.#OO..OOO...#.O..O......O........##..#...OO...#..
+....#O........#.O......O##...##O......#.O..O.O........##...#.O.......O..#OOOOO..#......O###..O..O.O.
+#.#..O.#.........O#...#O.##..O.....#..O...........##......O..#...O......#.................OO...#O.#.
+..O..#OO...OOO...O.#...#.......#OOOO#...#...O....O..#........OO....O..O..##.OO.O#....OO#O#..#....O..
+.O.O..........OOOO.#.#......O##...............#.O.OO.###.#....O..O.O#O...OO..O#O........#.O.....O#.O
+...#......#.#.....#........#O#.........#O....#O.O..#.###.....O#OOO#O#.#.O..#.#OOO..O.#....#O......#.
+O..O...#O.O.....O..O.#.#......O.#O#...#.....#..OO#.....OO.O#.O.....#....O.#...O...O.OO.....O....O#..
diff --git a/day14/uppga.c b/day14/uppga.c
@@ -0,0 +1,35 @@
+#include "common.h"
+
+static inline void move_north(char **grid, size_t nr, size_t nc, size_t r,
+                              size_t c) {
+  if (grid[r][c] != 'O')
+    return;
+  if (r == 0)
+    return;
+
+  if (grid[r - 1][c] == '.') {
+    grid[r - 1][c] = 'O';
+    grid[r][c] = '.';
+    move_north(grid, nr, nc, r - 1, c);
+  }
+}
+
+static inline void tilt_north(char **grid, size_t nr, size_t nc) {
+  size_t i, j;
+  for (i = 0; i < nr; i++) {
+    for (j = 0; j < nc; j++) {
+      move_north(grid, nr, nc, i, j);
+    }
+  }
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+  size_t nc = strlen(lines[0]) - 1;
+
+  tilt_north(lines, nlines, nc);
+  uint64_t l = load(lines, nlines, nc);
+
+  printf("%llu\n", l);
+}
diff --git a/day14/uppgb.c b/day14/uppgb.c
@@ -0,0 +1,187 @@
+#include "common.h"
+
+#define MAXNUM 1000
+#define NITS (1000000000L)
+
+static inline void move_south(char **grid, size_t nr, size_t nc, size_t r,
+                              size_t c) {
+  if (grid[r][c] != 'O')
+    return;
+  if (r == nr - 1)
+    return;
+
+  if (grid[r + 1][c] == '.') {
+    grid[r + 1][c] = 'O';
+    grid[r][c] = '.';
+    move_south(grid, nr, nc, r + 1, c);
+  }
+}
+
+static inline void tilt_south(char **grid, size_t nr, size_t nc) {
+  int i, j;
+  for (i = (int)(nr - 1); i >= 0; i--) {
+    for (j = 0; j < (int)nc; j++) {
+      move_south(grid, nr, nc, i, j);
+    }
+  }
+}
+
+static inline void move_east(char **grid, size_t nr, size_t nc, size_t r,
+                             size_t c) {
+  if (grid[r][c] != 'O')
+    return;
+  if (c == nc - 1)
+    return;
+
+  if (grid[r][c + 1] == '.') {
+    grid[r][c + 1] = 'O';
+    grid[r][c] = '.';
+    move_east(grid, nr, nc, r, c + 1);
+  }
+}
+
+static inline void tilt_east(char **grid, size_t nr, size_t nc) {
+  int i, j;
+  for (j = (int)(nc - 1); j >= 0; j--) {
+    for (i = 0; i < (int)nr; i++) {
+      move_east(grid, nr, nc, i, j);
+    }
+  }
+}
+
+static inline void move_west(char **grid, size_t nr, size_t nc, size_t r,
+                             size_t c) {
+  if (grid[r][c] != 'O')
+    return;
+  if (c == 0)
+    return;
+
+  if (grid[r][c - 1] == '.') {
+    grid[r][c - 1] = 'O';
+    grid[r][c] = '.';
+    move_west(grid, nr, nc, r, c - 1);
+  }
+}
+
+static inline void tilt_west(char **grid, size_t nr, size_t nc) {
+  int i, j;
+  for (j = 0; j < (int)nc; j++) {
+    for (i = 0; i < (int)nr; i++) {
+      move_west(grid, nr, nc, i, j);
+    }
+  }
+}
+
+static inline void move_north(char **grid, size_t nr, size_t nc, size_t r,
+                              size_t c) {
+  if (grid[r][c] != 'O')
+    return;
+  if (r == 0)
+    return;
+
+  if (grid[r - 1][c] == '.') {
+    grid[r - 1][c] = 'O';
+    grid[r][c] = '.';
+    move_north(grid, nr, nc, r - 1, c);
+  }
+}
+
+static inline void tilt_north(char **grid, size_t nr, size_t nc) {
+  size_t i, j;
+  for (i = 0; i < nr; i++) {
+    for (j = 0; j < nc; j++) {
+      move_north(grid, nr, nc, i, j);
+    }
+  }
+}
+
+static inline void tilt_cycle(char **grid, size_t nr, size_t nc) {
+  tilt_north(grid, nr, nc);
+  tilt_west(grid, nr, nc);
+  tilt_south(grid, nr, nc);
+  tilt_east(grid, nr, nc);
+}
+
+static inline void write_pos(uint8_t *p, char **grid, size_t nr, size_t nc) {
+  size_t i, j;
+  uint8_t *pp = p;
+
+  for (i = 0; i < nr; i++) {
+    for (j = 0; j < nc; j++) {
+      if (grid[i][j] == 'O') {
+        *pp = 1;
+        pp++;
+      } else if (grid[i][j] == '.') {
+        *pp = 0;
+        pp++;
+      }
+    }
+  }
+}
+
+static inline size_t add_pos(uint8_t **ps, size_t nps, char **grid, size_t nr,
+                             size_t nc, size_t npp) {
+  size_t i;
+
+  uint8_t n[npp];
+  write_pos(n, grid, nr, nc);
+
+  for (i = 0; i < nps; i++) {
+    if (memcmp(ps[i], n, npp) == 0)
+      return i;
+  }
+
+  memcpy(ps[nps], n, npp);
+
+  return nps;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t i, j, nlines, nc, nbum;
+  uint64_t l;
+  nlines = readlines(&lines, "input");
+
+  nc = strlen(lines[0]) - 1;
+
+  nbum = 0;
+  for (i = 0; i < nlines; i++) {
+    for (j = 0; j < nc; j++) {
+      if (lines[i][j] == 'O' || lines[i][j] == '.') {
+        nbum++;
+      }
+    }
+  }
+  uint8_t **ps = malloc(MAXNUM * sizeof(*ps));
+  for (i = 0; i < MAXNUM; i++) {
+    ps[i] = malloc(nbum * sizeof(*ps[i]));
+  }
+
+  size_t nps = 0;
+  size_t tmp;
+  for (i = 0; i < MAXNUM; i++) {
+    tmp = add_pos(ps, nps, lines, nlines, nc, nbum);
+    if (tmp != nps) {
+      break;
+    } else {
+      nps++;
+    }
+    tilt_cycle(lines, nlines, nc);
+  }
+  assert(i < MAXNUM);
+  size_t remaining_steps = NITS - tmp;
+  size_t cycle = nps - tmp;
+  size_t rr = remaining_steps % cycle;
+
+  for (i = 0; i < rr; i++) {
+    tilt_cycle(lines, nlines, nc);
+  }
+
+  for (i = 0; i < MAXNUM; i++) {
+    free(ps[i]);
+  }
+  free(ps);
+
+  l = load(lines, nlines, nc);
+  printf("%llu\n", l);
+}
diff --git a/day15/Makefile b/day15/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o ../utils/stack_str.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day15/common.c b/day15/common.c
@@ -0,0 +1,3 @@
+#include "common.h"
+
+size_t fn(char **lines, size_t nlines) { return 0; }
diff --git a/day15/common.h b/day15/common.h
@@ -0,0 +1,15 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/queue.h>
+
+#include <reading.h>
+#include <stack_str.h>
+
+size_t fn(char **lines, size_t nlines);
+
+#endif
diff --git a/day15/exinput b/day15/exinput
@@ -0,0 +1 @@
+rn=1,cm-,qp=3,cm=2,qp-,pc=4,ot=9,ab=5,pc-,pc=6,ot=7
diff --git a/day15/input b/day15/input
@@ -0,0 +1 @@
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diff --git a/day15/uppga.c b/day15/uppga.c
@@ -0,0 +1,30 @@
+#include "common.h"
+
+static inline char *hashnext(uint64_t *r, char *s) {
+  if (*s == '\0' || *s == '\n')
+    return NULL;
+  uint64_t v = 0;
+  char *cp = s;
+
+  while (*cp != '\0' && *cp != '\n' && *cp != ',') {
+    v = (17 * (v + ((uint64_t)*cp))) & 0xff;
+    cp++;
+  }
+
+  *r = v;
+
+  return cp + 1;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  readlines(&lines, "input");
+
+  uint64_t h, summa = 0;
+  char *cp = lines[0];
+  while ((cp = hashnext(&h, cp)) != NULL) {
+    summa += h;
+  }
+
+  printf("%llu\n", summa);
+}
diff --git a/day15/uppgb.c b/day15/uppgb.c
@@ -0,0 +1,139 @@
+#include "common.h"
+
+static inline uint64_t hash(char *s) {
+  uint64_t v = 0;
+  char *cp = s;
+
+  while (*cp != '\0' && *cp != '-' && *cp != '=') {
+    v = (17 * (v + ((uint64_t)*cp))) & 0xff;
+    cp++;
+  }
+
+  return v;
+}
+
+static inline stack_str parse(char *line) {
+  char *cp = line;
+
+  stack_str stack;
+  stack_str_init(&stack);
+
+  while (*cp != '\0' && *cp != '\n') {
+    stack_str_push(&stack, cp);
+    while (*cp != '\0' && *cp != '\n' && *cp != ',') {
+      cp++;
+    }
+    cp++;
+  }
+
+  return stack;
+}
+
+static inline char opn(char *s) {
+  char *c = s;
+  while (*c != '-' && *c != '=')
+    c++;
+
+  return *c;
+}
+
+static inline int cmp(char *s, char *t) {
+  char *cs = s;
+  char *ct = t;
+
+  while (*cs != '-' && *cs != '=' && *ct != '-' && *ct != '=') {
+    if (*cs != *ct)
+      return 1;
+    cs++;
+    ct++;
+  }
+
+  if (*cs == '=' && *ct == '-')
+    return 0;
+
+  if (*cs != *ct)
+    return 1;
+
+  return 0;
+}
+
+typedef TAILQ_HEAD(listhead, entry) lhead_t;
+
+typedef struct entry {
+  char *s;
+  uint64_t fl;
+  TAILQ_ENTRY(entry) entries;
+} entry_t;
+
+static inline void doop(char op, char *s, lhead_t *box) {
+  if (op == '-') {
+    entry_t *np;
+    TAILQ_FOREACH(np, box, entries) {
+      if (cmp(np->s, s) == 0) {
+        // remove np from list
+        TAILQ_REMOVE(box, np, entries);
+        free(np);
+        return;
+      }
+    }
+  } else {
+    uint64_t fl;
+    sread_next_u64(&fl, s);
+    entry_t *np;
+    TAILQ_FOREACH(np, box, entries) {
+      if (cmp(np->s, s) == 0) {
+        // CHANGE np
+        np->s = s;
+        np->fl = fl;
+        return;
+      }
+    }
+
+    // was not in list, add it to the end
+    entry_t *ne = malloc(sizeof(entry_t));
+    ne->s = s;
+    ne->fl = fl;
+    TAILQ_INSERT_TAIL(box, ne, entries);
+  }
+}
+
+static inline uint64_t boxval(lhead_t *box) {
+  entry_t *np;
+  uint64_t slot = 1;
+  uint64_t v = 0;
+
+  TAILQ_FOREACH(np, box, entries) {
+    v += slot * (np->fl);
+    slot++;
+  }
+
+  return v;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t i;
+  readlines(&lines, "input");
+
+  stack_str ops = parse(lines[0]);
+
+  // initialize dlinked lists
+  lhead_t lls[256];
+  for (i = 0; i < 256; i++) {
+    TAILQ_INIT(&lls[i]);
+  }
+
+  // operational state
+  for (i = 0; i < ops.nmemb; i++) {
+    uint64_t box = hash(ops.data[i]);
+    doop(opn(ops.data[i]), ops.data[i], &lls[box]);
+  }
+
+  // count sum
+  uint64_t summa = 0;
+  for (i = 0; i < 256; i++) {
+    summa += (i + 1) * boxval(&lls[i]);
+  }
+
+  printf("%llu\n", summa);
+}
diff --git a/day16/Makefile b/day16/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day16/common.c b/day16/common.c
@@ -0,0 +1,3 @@
+#include "common.h"
+
+size_t fn(char **lines, size_t nlines) { return 0; }
diff --git a/day16/common.h b/day16/common.h
@@ -0,0 +1,13 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <reading.h>
+
+size_t fn(char **lines, size_t nlines);
+
+#endif
diff --git a/day16/exinput b/day16/exinput
@@ -0,0 +1,10 @@
+.|...\....
+|.-.\.....
+.....|-...
+........|.
+..........
+.........\
+..../.\\..
+.-.-/..|..
+.|....-|.\
+..//.|....
diff --git a/day16/input b/day16/input
@@ -0,0 +1,110 @@
+\.................-....-.-.|....................|......./.|.\................|...........|....--..............
+............-...................|.............|..-.......-/..............-....\...............................
+|.......//...........................................|...............-......../.....\....................\....
+....|......-.-.............-......\.....\......../..................../.......................................
+..\..\../................../.............-............|....-.........................|......|...............|.
+-..|........................./.................\.........\./.............\..|..-...-.............\............
+.\......||-..................../................-................./....|........................|.............
+..............\./...........-.........../-................-.........\...\........../-.......|.................
+....-..........-.-.....\......................../.......-..........-/.....................||................|.
+./..........|/............................\./............................./....../........\...-|............\-
+........\.............................-...../............---...........|...............|......\\..............
+........//....|.\......./...\.............|..............\............./...........-.|..-.............|.......
+...................\...........-/..-......\...|........-.|................\-.......|........\.................
+|.|....../|............\./..-........\..............................-.....................|....../............
+............-....................-..............-..-................|.//.............-.............-..........
+..........-.......-......|-................./........../...\........-.......................-..\.......\......
+................../....|............-....../................./.....................|.................-........
+...\..............--..|.....||.....\.............\../................................................-.-...../
+.........-......|....-.................-.......\-................./..|...................|\.....\.....|.|-....
+......................-......................-............/....................\...../...\..../...............
+...../......-...............\...-....|......../.........\................................|.........../........
+........../.......\..............-...............\........-|....-......-.............|...........|........./..
+./...............\....../....../..../...................................................|.....|.|../......./..
+....|\........\-...../...................-.............\.\..................................././..........\...
+....................................-..../......................-..///......-...|.|..........................|
+.........-\.....-...........|........./..........-..\.....\./...................-........................-....
+....../.......././......--.....|.\..-...-....\..........................-....-...-..|.|.....|.......\-./......
+...-....................-................|.............-../........|../........-.............|\...............
+...../...........-......../................|................|.....\.....-.............../...|....../\.........
+./...\.....\..-./.........................|................................-....................-.............
+.............\|.../....\\.....\..|...........\.....................|......|.|.....|.....-............\.\......
+........................|......-..........-.../......-........|...../.\|...-................................|.
+.......\...-...\..........|.....\...................\.........|..........-/.........\...................../...
+.-|.......|............./..|./....-.../...\............-......../..............-.......//...-...........||.\..
+..|..\./..-........\..|....-..\.........../..............................|..\..................../..|...../-..
+.|.........-.\...........................\..../......./....||............\..........|............-.\|.........
+....................\..../|............................\.../..|........./...../............||........\....../.
+....................../.....|...................|......|.................|..|.......|................|........
+.....................\.........-..../.........../../..-......\.................|.../....................../...
+........\.-................/........\...../....../.|.\...|/../..........................................-.....
+....................................|......./...../............-................-/..|.-....................\..
+..|.........................-....................../...|.....|.............../.........../.....|\.............
+.......................................|.\.|.......................-.......|..............\............-./....
+..........//................\..|./................-.................-..../../|................................
+.|......................................./............/..-.......-.|.........................\|..|............
+............................/.-..................-./..../..............|-.........-|..........................
+.................-...|................\.........|\...............................\...........\...//...........
+........\..|.|--.............|.......\.................|......|\./.........................\.|................
+.-|.............|\|.....\|././...|..\.............\..\...................\...........\...../..................
+..../..............-..|...|.........-.........\.....-...........-.....|...\.-....-../.................\.......
+........\.|........\\.........-...............-.......-..................................../..........|.......
+...............-...................\/...............\..-\...........|.-........-.\-.....\....\..../......-....
+.../-......./..............|.......|..//......-....................../.|....\......|..\.........../-\.........
+.-....|./....-.../....../.....-..............\..-..\..-............\................|...|..........-.......|..
+|......../...................\..../....\......./..|.................\...............\.........\../.|......../.
+../............/........|..|.......................................\../\...............\............/.......\.
+........-.-...\........../.......-....-............./.............-......./................\..........-.......
+.../-................/......|/........-......|..........|..-..............|/..........................-.......
+......./............../...................|../...../................./../..........\../.....\....\............
+..............-..|../-........................|...\.../...-/..........\.......\......\.................-....-.
+......................................-/.\........................../......-..\..\........\...............|..\
+.............-.........../-|........-........\....-.....\....../..\........................\......|.......\...
+.././....................|\.../\.........\.|.............../..../...|......./.\...|.......\.........|.........
+......................./........./-./...........................|/...\........-.../.................||........
+..............|./........\..............\.............................|/................../............|.-..|.
+.........................-......../........./.....|....-..-.-..............-.-......../.......\...\./.........
+.-............../../....\//......../...|......|......\..................-......\.....-....\|.........|........
+..............-.....................\.................\.|...-............................|......\.............
+\\.....|...........\............|............................../............................................\.
+.-........../|...\..............-...............................\...........\.....|......\..........\.........
+.\............\.|....-........./....../../.....-..\........|...............-..................|............-.|
+.....\......-.........-.........|....../..-....|.....\..../....|........-.....................................
+..........\-..-..../\.....................\.........-...........|..../-.......................\....-..........
+...../............./..|..................../............../../.........|...............-../...................
+.....|...../.....|......-.............................|...........-......................./............/......
+.....................||./.-.................-.........\.\..................-..............\...--.........\....
+.|......-......-.\.......-......\....\..\..|.........../......./.....................-..........|.............
+.....\.....\............................--..................|..-........\....\...\.|.\.-...........\...\......
+./...........\.......\/......|........./..|................\-................/....\...................\.\.....
+..|...............................-.........-.|/......|.....|........\........................................
+.......|............-............../............-......../..-...\|-...-..../...........-..........-..-/.......
+............................-..\.......................................-.........................\..........-.
+........................\.........|................||...-....\......\.....\.................\...\\....../.....
+....\../.....-.......-.................-|...................-../.|-............|........-|......./../...\.....
+..................................................\.......|......./..\./......../....|....-|.-................
+....../.........|.......|...|.......\.../|...............-.......-\..\......././..................|..\.|...../
+............|.....\...........-.............................../.....-.................-.../............/.../..
+...../.......\............................|.....\....\................/..................\......../...........
+..................-....\.........\|................/|......../.-................|...\......................--.
+......-..-.....................................-\.........|.../.....................|..|.-.....\...|....\....-
+......-......-.................-......|..................................................|....................
+..\...............|......../........-......./.............../...........-..........|/.....///\.....-..........
+.........../..|.............../..........\|.........................\...|.....\||....\...|.|/.....-....../....
+...../...../.....-............................................|........|............|.........................
+......-../\................../..............\............\.................../|...........|.............\.....
+...........-..........................-....\..\..|.-..............................................\........|..
+/.--..//....\...............................-............|..././..............................................
+/...............|.........../..../......................\.....|............|...........|...................-..
+..-................\../|......../...................../...........\..|.|\../..................................
+....|...../.....-......\.........................-.....//...............|.........-.......|...-....--.........
+....|..\.-..../....................|..........\............./...........\.../.................................
+............................\...................................../.......................|...........\.......
+.........../.....-.....................\..\.-..|............-...............\.........................-.......
+......-.......-\.\......\..-.-........./...........\..........|........................\.....-.....\..........
+..............-....../.-............./........../..............\-....-.../...../.-............\......./.-.....
+......|...................................................||..../...|\.....................-.../...\........|.
+......|.//........................-...../...........-..\...|......|..................../........../...........
+.....................................................|.........//...........|\.....\....................|.../.
+............-..||...........|....../....................\...\................................../.......|......
+..\....\......./-\.\...........-\................|.........../................||.../.....-...........\........
diff --git a/day16/uppga.c b/day16/uppga.c
@@ -0,0 +1,227 @@
+#include "common.h"
+#include <sys/queue.h>
+
+#define NDIRS 4
+enum direction { RIGHT, DOWN, LEFT, UP };
+
+typedef struct {
+  size_t r;
+  size_t c;
+  enum direction dir;
+} walker;
+
+typedef SIMPLEQ_HEAD(listhead, entry) head_t;
+typedef struct entry {
+  walker v;
+  SIMPLEQ_ENTRY(entry) entries;
+} entry_t;
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nrows = readlines(&lines, "input");
+
+  size_t ncols = strnlen(lines[0], 1024);
+  assert(ncols < 1024);
+  ncols--;
+
+  uint8_t hit[NDIRS][nrows][ncols];
+  size_t i, j, k;
+  for (k = 0; k < NDIRS; k++) {
+    for (i = 0; i < nrows; i++) {
+      for (j = 0; j < ncols; j++) {
+        hit[k][i][j] = 0;
+      }
+    }
+  }
+
+  // init queue
+  head_t head = SIMPLEQ_HEAD_INITIALIZER(head);
+
+  // initialize the start
+  walker start = {.r = 0, .c = 0, .dir = RIGHT};
+  entry_t *se = malloc(sizeof(*se));
+  se->v = start;
+  SIMPLEQ_INSERT_HEAD(&head, se, entries);
+  hit[RIGHT][0][0] = 1;
+
+  entry_t *c;
+  while (!SIMPLEQ_EMPTY(&head)) {
+    c = SIMPLEQ_FIRST(&head);
+    SIMPLEQ_REMOVE_HEAD(&head, entries);
+
+    walker t = c->v;
+    printf("Walker (%zu, %zu, %zu)\n", t.dir, t.r, t.c);
+    switch (t.dir) {
+    case RIGHT:
+      if (lines[t.r][t.c] == '.' || lines[t.r][t.c] == '-') {
+        if (t.c < ncols - 1 && !hit[RIGHT][t.r][t.c + 1]) {
+          (c->v).c++;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[RIGHT][t.r][t.c + 1] = 1;
+        } else {
+          free(c);
+        }
+      } else if (lines[t.r][t.c] == '\\') {
+        if (t.r < nrows - 1 && !hit[DOWN][t.r + 1][t.c]) {
+          (c->v).r++;
+          (c->v).dir = DOWN;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[DOWN][t.r + 1][t.c] = 1;
+        } else {
+          free(c);
+        }
+      } else if (lines[t.r][t.c] == '/' || lines[t.r][t.c] == '|') {
+        if (t.r > 0 && !hit[UP][t.r - 1][t.c]) {
+          (c->v).r--;
+          (c->v).dir = UP;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[UP][t.r - 1][t.c] = 1;
+        } else {
+          free(c);
+        }
+
+        if (lines[t.r][t.c] == '|' && t.r < nrows - 1 &&
+            !hit[DOWN][t.r + 1][t.c]) {
+          entry_t *nc = malloc(sizeof(*nc));
+          (nc->v).c = t.c;
+          (nc->v).r = t.r + 1;
+          (nc->v).dir = DOWN;
+          SIMPLEQ_INSERT_TAIL(&head, nc, entries);
+          hit[DOWN][t.r + 1][t.c] = 1;
+        }
+      }
+      break;
+    case DOWN:
+      if (lines[t.r][t.c] == '.' || lines[t.r][t.c] == '|') {
+        if (t.r < nrows - 1 && !hit[DOWN][t.r + 1][t.c]) {
+          (c->v).r++;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[DOWN][t.r + 1][t.c] = 1;
+        } else {
+          free(c);
+        }
+      } else if (lines[t.r][t.c] == '\\') {
+        if (t.c < ncols - 1 && !hit[RIGHT][t.r][t.c + 1]) {
+          (c->v).c++;
+          (c->v).dir = RIGHT;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[RIGHT][t.r][t.c + 1] = 1;
+        } else {
+          free(c);
+        }
+      } else if (lines[t.r][t.c] == '/' || lines[t.r][t.c] == '-') {
+        if (t.c > 0 && !hit[LEFT][t.r][t.c - 1]) {
+          (c->v).c--;
+          (c->v).dir = LEFT;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[LEFT][t.r][t.c - 1] = 1;
+        } else {
+          free(c);
+        }
+
+        if (lines[t.r][t.c] == '-' && t.c < ncols - 1 &&
+            !hit[RIGHT][t.r][t.c + 1]) {
+          entry_t *nc = malloc(sizeof(*nc));
+          (nc->v).c = t.c + 1;
+          (nc->v).r = t.r;
+          (nc->v).dir = RIGHT;
+          SIMPLEQ_INSERT_TAIL(&head, nc, entries);
+          hit[RIGHT][t.r][t.c + 1] = 1;
+        }
+      }
+      break;
+    case LEFT:
+      if (lines[t.r][t.c] == '.' || lines[t.r][t.c] == '-') {
+        if (t.c > 0 && !hit[LEFT][t.r][t.c - 1]) {
+          (c->v).c--;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[LEFT][t.r][t.c - 1] = 1;
+        } else {
+          free(c);
+        }
+      } else if (lines[t.r][t.c] == '\\') {
+        if (t.r > 0 && !hit[UP][t.r - 1][t.c]) {
+          (c->v).r--;
+          (c->v).dir = UP;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[UP][t.r - 1][t.c] = 1;
+        } else {
+          free(c);
+        }
+      } else if (lines[t.r][t.c] == '/' || lines[t.r][t.c] == '|') {
+        if (t.r < nrows - 1 && !hit[DOWN][t.r + 1][t.c]) {
+          (c->v).r++;
+          (c->v).dir = DOWN;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[DOWN][t.r + 1][t.c] = 1;
+        } else {
+          free(c);
+        }
+
+        if (lines[t.r][t.c] == '|' && t.r > 0 && !hit[UP][t.r - 1][t.c]) {
+          entry_t *nc = malloc(sizeof(*nc));
+          (nc->v).c = t.c;
+          (nc->v).r = t.r - 1;
+          (nc->v).dir = UP;
+          SIMPLEQ_INSERT_TAIL(&head, nc, entries);
+          hit[UP][t.r - 1][t.c] = 1;
+        }
+      }
+      break;
+    case UP:
+      if (lines[t.r][t.c] == '.' || lines[t.r][t.c] == '|') {
+        if (t.r > 0 && !hit[UP][t.r - 1][t.c]) {
+          (c->v).r--;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[UP][t.r - 1][t.c] = 1;
+        } else {
+          free(c);
+        }
+      } else if (lines[t.r][t.c] == '\\') {
+        if (t.c > 0 && !hit[LEFT][t.r][t.c - 1]) {
+          (c->v).c--;
+          (c->v).dir = LEFT;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[LEFT][t.r][t.c - 1] = 1;
+        } else {
+          free(c);
+        }
+      } else if (lines[t.r][t.c] == '/' || lines[t.r][t.c] == '-') {
+        if (t.c < ncols - 1 && !hit[RIGHT][t.r][t.c + 1]) {
+          (c->v).c++;
+          (c->v).dir = RIGHT;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[RIGHT][t.r][t.c + 1] = 1;
+        } else {
+          free(c);
+        }
+
+        if (lines[t.r][t.c] == '-' && t.c > 0 && !hit[LEFT][t.r][t.c - 1]) {
+          entry_t *nc = malloc(sizeof(*nc));
+          (nc->v).c = t.c - 1;
+          (nc->v).r = t.r;
+          (nc->v).dir = LEFT;
+          SIMPLEQ_INSERT_TAIL(&head, nc, entries);
+          hit[LEFT][t.r][t.c - 1] = 1;
+        }
+      }
+      break;
+    }
+  }
+
+  uint64_t count = 0;
+  for (i = 0; i < nrows; i++) {
+    for (j = 0; j < ncols; j++) {
+      if (hit[RIGHT][i][j] || hit[LEFT][i][j] || hit[DOWN][i][j] ||
+          hit[UP][i][j]) {
+        printf("#");
+        count++;
+      } else {
+        printf(".");
+      }
+    }
+    printf("\n");
+  }
+
+  printf("%llu\n", count);
+}
diff --git a/day16/uppgb.c b/day16/uppgb.c
@@ -0,0 +1,298 @@
+#include "common.h"
+#include <sys/queue.h>
+
+#define NDIRS 4
+enum direction { RIGHT, DOWN, LEFT, UP };
+
+typedef struct {
+  size_t r;
+  size_t c;
+  enum direction dir;
+} walker;
+
+typedef SIMPLEQ_HEAD(listhead, entry) head_t;
+typedef struct entry {
+  walker v;
+  SIMPLEQ_ENTRY(entry) entries;
+} entry_t;
+
+static inline uint64_t energizer_count(size_t start_r, size_t start_c,
+                                       enum direction start_dir, size_t nrows,
+                                       size_t ncols, char **lines,
+                                       uint8_t ***hit) {
+  size_t i, j;
+  // init queue
+  head_t head = SIMPLEQ_HEAD_INITIALIZER(head);
+
+  // initialize the start
+  walker start = {.r = start_r, .c = start_c, .dir = start_dir};
+  entry_t *se = malloc(sizeof(*se));
+  se->v = start;
+  SIMPLEQ_INSERT_HEAD(&head, se, entries);
+  hit[start_dir][start_r][start_c] = 1;
+
+  entry_t *c;
+  while (!SIMPLEQ_EMPTY(&head)) {
+    c = SIMPLEQ_FIRST(&head);
+    SIMPLEQ_REMOVE_HEAD(&head, entries);
+
+    walker t = c->v;
+    switch (t.dir) {
+    case RIGHT:
+      if (lines[t.r][t.c] == '.' || lines[t.r][t.c] == '-') {
+        if (t.c < ncols - 1 && !hit[RIGHT][t.r][t.c + 1]) {
+          (c->v).c++;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[RIGHT][t.r][t.c + 1] = 1;
+        } else {
+          free(c);
+        }
+      } else if (lines[t.r][t.c] == '\\') {
+        if (t.r < nrows - 1 && !hit[DOWN][t.r + 1][t.c]) {
+          (c->v).r++;
+          (c->v).dir = DOWN;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[DOWN][t.r + 1][t.c] = 1;
+        } else {
+          free(c);
+        }
+      } else if (lines[t.r][t.c] == '/' || lines[t.r][t.c] == '|') {
+        if (t.r > 0 && !hit[UP][t.r - 1][t.c]) {
+          (c->v).r--;
+          (c->v).dir = UP;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[UP][t.r - 1][t.c] = 1;
+        } else {
+          free(c);
+        }
+
+        if (lines[t.r][t.c] == '|' && t.r < nrows - 1 &&
+            !hit[DOWN][t.r + 1][t.c]) {
+          entry_t *nc = malloc(sizeof(*nc));
+          (nc->v).c = t.c;
+          (nc->v).r = t.r + 1;
+          (nc->v).dir = DOWN;
+          SIMPLEQ_INSERT_TAIL(&head, nc, entries);
+          hit[DOWN][t.r + 1][t.c] = 1;
+        }
+      }
+      break;
+    case DOWN:
+      if (lines[t.r][t.c] == '.' || lines[t.r][t.c] == '|') {
+        if (t.r < nrows - 1 && !hit[DOWN][t.r + 1][t.c]) {
+          (c->v).r++;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[DOWN][t.r + 1][t.c] = 1;
+        } else {
+          free(c);
+        }
+      } else if (lines[t.r][t.c] == '\\') {
+        if (t.c < ncols - 1 && !hit[RIGHT][t.r][t.c + 1]) {
+          (c->v).c++;
+          (c->v).dir = RIGHT;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[RIGHT][t.r][t.c + 1] = 1;
+        } else {
+          free(c);
+        }
+      } else if (lines[t.r][t.c] == '/' || lines[t.r][t.c] == '-') {
+        if (t.c > 0 && !hit[LEFT][t.r][t.c - 1]) {
+          (c->v).c--;
+          (c->v).dir = LEFT;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[LEFT][t.r][t.c - 1] = 1;
+        } else {
+          free(c);
+        }
+
+        if (lines[t.r][t.c] == '-' && t.c < ncols - 1 &&
+            !hit[RIGHT][t.r][t.c + 1]) {
+          entry_t *nc = malloc(sizeof(*nc));
+          (nc->v).c = t.c + 1;
+          (nc->v).r = t.r;
+          (nc->v).dir = RIGHT;
+          SIMPLEQ_INSERT_TAIL(&head, nc, entries);
+          hit[RIGHT][t.r][t.c + 1] = 1;
+        }
+      }
+      break;
+    case LEFT:
+      if (lines[t.r][t.c] == '.' || lines[t.r][t.c] == '-') {
+        if (t.c > 0 && !hit[LEFT][t.r][t.c - 1]) {
+          (c->v).c--;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[LEFT][t.r][t.c - 1] = 1;
+        } else {
+          free(c);
+        }
+      } else if (lines[t.r][t.c] == '\\') {
+        if (t.r > 0 && !hit[UP][t.r - 1][t.c]) {
+          (c->v).r--;
+          (c->v).dir = UP;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[UP][t.r - 1][t.c] = 1;
+        } else {
+          free(c);
+        }
+      } else if (lines[t.r][t.c] == '/' || lines[t.r][t.c] == '|') {
+        if (t.r < nrows - 1 && !hit[DOWN][t.r + 1][t.c]) {
+          (c->v).r++;
+          (c->v).dir = DOWN;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[DOWN][t.r + 1][t.c] = 1;
+        } else {
+          free(c);
+        }
+
+        if (lines[t.r][t.c] == '|' && t.r > 0 && !hit[UP][t.r - 1][t.c]) {
+          entry_t *nc = malloc(sizeof(*nc));
+          (nc->v).c = t.c;
+          (nc->v).r = t.r - 1;
+          (nc->v).dir = UP;
+          SIMPLEQ_INSERT_TAIL(&head, nc, entries);
+          hit[UP][t.r - 1][t.c] = 1;
+        }
+      }
+      break;
+    case UP:
+      if (lines[t.r][t.c] == '.' || lines[t.r][t.c] == '|') {
+        if (t.r > 0 && !hit[UP][t.r - 1][t.c]) {
+          (c->v).r--;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[UP][t.r - 1][t.c] = 1;
+        } else {
+          free(c);
+        }
+      } else if (lines[t.r][t.c] == '\\') {
+        if (t.c > 0 && !hit[LEFT][t.r][t.c - 1]) {
+          (c->v).c--;
+          (c->v).dir = LEFT;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[LEFT][t.r][t.c - 1] = 1;
+        } else {
+          free(c);
+        }
+      } else if (lines[t.r][t.c] == '/' || lines[t.r][t.c] == '-') {
+        if (t.c < ncols - 1 && !hit[RIGHT][t.r][t.c + 1]) {
+          (c->v).c++;
+          (c->v).dir = RIGHT;
+          SIMPLEQ_INSERT_TAIL(&head, c, entries);
+          hit[RIGHT][t.r][t.c + 1] = 1;
+        } else {
+          free(c);
+        }
+
+        if (lines[t.r][t.c] == '-' && t.c > 0 && !hit[LEFT][t.r][t.c - 1]) {
+          entry_t *nc = malloc(sizeof(*nc));
+          (nc->v).c = t.c - 1;
+          (nc->v).r = t.r;
+          (nc->v).dir = LEFT;
+          SIMPLEQ_INSERT_TAIL(&head, nc, entries);
+          hit[LEFT][t.r][t.c - 1] = 1;
+        }
+      }
+      break;
+    }
+  }
+
+  uint64_t count = 0;
+  for (i = 0; i < nrows; i++) {
+    for (j = 0; j < ncols; j++) {
+      if (hit[RIGHT][i][j] || hit[LEFT][i][j] || hit[DOWN][i][j] ||
+          hit[UP][i][j]) {
+        count++;
+      }
+    }
+  }
+
+  return count;
+}
+
+static inline void zeroise_hits(uint8_t ***hit, size_t nrows, size_t ncols) {
+  size_t i, j, k;
+  for (k = 0; k < NDIRS; k++) {
+    hit[k] = malloc(nrows * sizeof(*hit[k]));
+    for (i = 0; i < nrows; i++) {
+      hit[k][i] = malloc(ncols * sizeof(*hit[k][i]));
+      for (j = 0; j < ncols; j++) {
+        hit[k][i][j] = 0;
+      }
+    }
+  }
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nrows = readlines(&lines, "input");
+
+  size_t ncols = strnlen(lines[0], 1024);
+  assert(ncols < 1024);
+  ncols--;
+
+  uint8_t **hit[NDIRS];
+  size_t i, j, k;
+  for (k = 0; k < NDIRS; k++) {
+    hit[k] = malloc(nrows * sizeof(*hit[k]));
+    for (i = 0; i < nrows; i++) {
+      hit[k][i] = malloc(ncols * sizeof(*hit[k][i]));
+      for (j = 0; j < ncols; j++) {
+        hit[k][i][j] = 0;
+      }
+    }
+  }
+
+  uint64_t max_count = 0;
+  uint64_t count;
+
+  // top row, downwards
+  for (i = 0; i < ncols; i++) {
+    count = energizer_count(0, i, DOWN, nrows, ncols, lines, hit);
+    if (count > max_count)
+      max_count = count;
+    zeroise_hits(hit, nrows, ncols);
+  }
+
+  // bottom row, upwards
+  for (i = 0; i < ncols; i++) {
+    count = energizer_count(nrows - 1, i, UP, nrows, ncols, lines, hit);
+    if (count > max_count)
+      max_count = count;
+    zeroise_hits(hit, nrows, ncols);
+  }
+
+  // left side, rightwards
+  for (i = 0; i < nrows; i++) {
+    count = energizer_count(i, 0, RIGHT, nrows, ncols, lines, hit);
+    if (count > max_count)
+      max_count = count;
+    zeroise_hits(hit, nrows, ncols);
+  }
+
+  // right side, leftwards
+  for (i = 0; i < nrows; i++) {
+    count = energizer_count(i, ncols - 1, LEFT, nrows, ncols, lines, hit);
+    if (count > max_count)
+      max_count = count;
+    zeroise_hits(hit, nrows, ncols);
+  }
+
+  // remaining corners
+  count = energizer_count(0, 0, RIGHT, nrows, ncols, lines, hit);
+  if (count > max_count)
+    max_count = count;
+  zeroise_hits(hit, nrows, ncols);
+  count = energizer_count(0, ncols - 1, LEFT, nrows, ncols, lines, hit);
+  if (count > max_count)
+    max_count = count;
+  zeroise_hits(hit, nrows, ncols);
+  count = energizer_count(nrows - 1, 0, RIGHT, nrows, ncols, lines, hit);
+  if (count > max_count)
+    max_count = count;
+  zeroise_hits(hit, nrows, ncols);
+  count = energizer_count(nrows - 1, ncols - 1, LEFT, nrows, ncols, lines, hit);
+  if (count > max_count)
+    max_count = count;
+  zeroise_hits(hit, nrows, ncols);
+
+  printf("%llu\n", max_count);
+}
diff --git a/day17/Makefile b/day17/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o ../utils/wdg.o ../utils/stack_u64.o ../utils/fheap.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day17/common.c b/day17/common.c
@@ -0,0 +1,3 @@
+#include "common.h"
+
+size_t fn(char **lines, size_t nlines) { return 0; }
diff --git a/day17/common.h b/day17/common.h
@@ -0,0 +1,14 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <reading.h>
+#include <wdg.h>
+
+size_t fn(char **lines, size_t nlines);
+
+#endif
diff --git a/day17/exinput b/day17/exinput
@@ -0,0 +1,13 @@
+2413432311323
+3215453535623
+3255245654254
+3446585845452
+4546657867536
+1438598798454
+4457876987766
+3637877979653
+4654967986887
+4564679986453
+1224686865563
+2546548887735
+4322674655533
diff --git a/day17/input b/day17/input
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diff --git a/day17/uppga.c b/day17/uppga.c
@@ -0,0 +1,111 @@
+#include "common.h"
+
+#define NDIRS 4
+#define NMOVES 3
+#define MAX_NBRS 2048
+
+typedef struct {
+  int64_t r;
+  int64_t c;
+  size_t d;
+  uint64_t acc;
+} nbr_t;
+
+const int64_t dirm[4][2][2] = {{{0, -1}, {0, +1}},
+                               {{+1, 0}, {-1, 0}},
+                               {{0, -1}, {0, +1}},
+                               {{+1, 0}, {-1, 0}}};
+
+static inline size_t dirr(const int64_t dir[2]) {
+  if (dir[0] == 0) {
+    if (dir[1] == -1)
+      return 3;
+    return 1;
+  } else {
+    if (dir[0] == -1)
+      return 0;
+    return 2;
+  }
+}
+
+static inline void nbrs_append(nbr_t *out, size_t *nout, int64_t r, int64_t c,
+                               size_t d, uint64_t acc) {
+  assert(*nout < MAX_NBRS);
+  out[*nout] = (nbr_t){.r = r, .c = c, .d = d, .acc = acc};
+  (*nout)++;
+}
+
+static inline void pnbrs(nbr_t *out, size_t *nout, int64_t r, int64_t c,
+                         size_t d, int64_t nr, int64_t nc, uint64_t **cost,
+                         size_t lb, size_t ub) {
+  *nout = 0;
+  size_t i;
+  for (i = 0; i < 2; i++) {
+    int64_t dd[2] = {dirm[d][i][0], dirm[d][i][1]};
+    size_t acc = 0;
+    size_t ste = 0;
+    int64_t rr = r;
+    int64_t cc = c;
+    while (0 <= r && r < nr && 0 <= c && c < nc && ste <= ub) {
+      rr += dd[0];
+      cc += dd[1];
+      ste++;
+      if (0 <= rr && rr < nr && 0 <= cc && cc < nc) {
+        acc += cost[rr][cc];
+        if (ste >= lb)
+          nbrs_append(out, nout, rr, cc, dirr(dd), acc);
+      }
+    }
+  }
+}
+
+static inline size_t tuple_to_node(int64_t r, int64_t c, size_t d, size_t nc) {
+  return ((size_t)r) * nc * NDIRS + ((size_t)c) * NDIRS + d;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nr = readlines(&lines, "input");
+
+  size_t nc = strlen(lines[0]) - 1;
+
+  uint64_t **costs = malloc(nr * sizeof(*costs));
+  size_t i, j, k, l, nnbrs, nv, nw;
+  for (i = 0; i < nr; i++)
+    costs[i] = malloc(nc * sizeof(**costs));
+  for (i = 0; i < nr; i++) {
+    for (j = 0; j < nc; j++) {
+      costs[i][j] = (uint64_t)(lines[i][j] - '0');
+    }
+  }
+
+  nbr_t *nbrs = malloc(MAX_NBRS * sizeof(*nbrs));
+  size_t nvertices = nr * nc * NDIRS + 2;
+  wdg_t g;
+  wdg_init(&g, nvertices);
+
+  for (i = 0; i < nr; i++) {
+    for (j = 0; j < nc; j++) {
+      for (k = 0; k < NDIRS; k++) {
+        pnbrs(nbrs, &nnbrs, i, j, k, nr, nc, costs, 0, 2);
+        nv = tuple_to_node(i, j, k, nc);
+        for (l = 0; l < nnbrs; l++) {
+          nw = tuple_to_node(nbrs[l].r, nbrs[l].c, nbrs[l].d, nc);
+          wdg_add_edge(&g, nv, nw, nbrs[l].acc);
+        }
+      }
+    }
+  }
+  free(nbrs);
+
+  size_t start = nvertices - 2;
+  size_t end = nvertices - 1;
+
+  for (i = 0; i < NDIRS; i++)
+    wdg_add_edge(&g, tuple_to_node(nr - 1, nc - 1, i, nc), end, 0);
+  wdg_add_edge(&g, start, tuple_to_node(0, 0, 0, nc), 0);
+  wdg_add_edge(&g, start, tuple_to_node(0, 0, 3, nc), 0);
+
+  uint64_t tot = wdg_dijkstra(&g, start, end);
+  printf("%llu\n", tot);
+}
diff --git a/day17/uppgb.c b/day17/uppgb.c
@@ -0,0 +1,111 @@
+#include "common.h"
+
+#define NDIRS 4
+#define NMOVES 3
+#define MAX_NBRS 2048
+
+typedef struct {
+  int64_t r;
+  int64_t c;
+  size_t d;
+  uint64_t acc;
+} nbr_t;
+
+const int64_t dirm[4][2][2] = {{{0, -1}, {0, +1}},
+                               {{+1, 0}, {-1, 0}},
+                               {{0, -1}, {0, +1}},
+                               {{+1, 0}, {-1, 0}}};
+
+static inline size_t dirr(const int64_t dir[2]) {
+  if (dir[0] == 0) {
+    if (dir[1] == -1)
+      return 3;
+    return 1;
+  } else {
+    if (dir[0] == -1)
+      return 0;
+    return 2;
+  }
+}
+
+static inline void nbrs_append(nbr_t *out, size_t *nout, int64_t r, int64_t c,
+                               size_t d, uint64_t acc) {
+  assert(*nout < MAX_NBRS);
+  out[*nout] = (nbr_t){.r = r, .c = c, .d = d, .acc = acc};
+  (*nout)++;
+}
+
+static inline void pnbrs(nbr_t *out, size_t *nout, int64_t r, int64_t c,
+                         size_t d, int64_t nr, int64_t nc, uint64_t **cost,
+                         size_t lb, size_t ub) {
+  *nout = 0;
+  size_t i;
+  for (i = 0; i < 2; i++) {
+    int64_t dd[2] = {dirm[d][i][0], dirm[d][i][1]};
+    size_t acc = 0;
+    size_t ste = 0;
+    int64_t rr = r;
+    int64_t cc = c;
+    while (0 <= r && r < nr && 0 <= c && c < nc && ste <= ub) {
+      rr += dd[0];
+      cc += dd[1];
+      ste++;
+      if (0 <= rr && rr < nr && 0 <= cc && cc < nc) {
+        acc += cost[rr][cc];
+        if (ste >= lb)
+          nbrs_append(out, nout, rr, cc, dirr(dd), acc);
+      }
+    }
+  }
+}
+
+static inline size_t tuple_to_node(int64_t r, int64_t c, size_t d, size_t nc) {
+  return ((size_t)r) * nc * NDIRS + ((size_t)c) * NDIRS + d;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nr = readlines(&lines, "input");
+
+  size_t nc = strlen(lines[0]) - 1;
+
+  uint64_t **costs = malloc(nr * sizeof(*costs));
+  size_t i, j, k, l, nnbrs, nv, nw;
+  for (i = 0; i < nr; i++)
+    costs[i] = malloc(nc * sizeof(**costs));
+  for (i = 0; i < nr; i++) {
+    for (j = 0; j < nc; j++) {
+      costs[i][j] = (uint64_t)(lines[i][j] - '0');
+    }
+  }
+
+  nbr_t *nbrs = malloc(MAX_NBRS * sizeof(*nbrs));
+  size_t nvertices = nr * nc * NDIRS + 2;
+  wdg_t g;
+  wdg_init(&g, nvertices);
+
+  for (i = 0; i < nr; i++) {
+    for (j = 0; j < nc; j++) {
+      for (k = 0; k < NDIRS; k++) {
+        pnbrs(nbrs, &nnbrs, i, j, k, nr, nc, costs, 4, 9);
+        nv = tuple_to_node(i, j, k, nc);
+        for (l = 0; l < nnbrs; l++) {
+          nw = tuple_to_node(nbrs[l].r, nbrs[l].c, nbrs[l].d, nc);
+          wdg_add_edge(&g, nv, nw, nbrs[l].acc);
+        }
+      }
+    }
+  }
+  free(nbrs);
+
+  size_t start = nvertices - 2;
+  size_t end = nvertices - 1;
+
+  for (i = 0; i < NDIRS; i++)
+    wdg_add_edge(&g, tuple_to_node(nr - 1, nc - 1, i, nc), end, 0);
+  wdg_add_edge(&g, start, tuple_to_node(0, 0, 0, nc), 0);
+  wdg_add_edge(&g, start, tuple_to_node(0, 0, 3, nc), 0);
+
+  uint64_t tot = wdg_dijkstra(&g, start, end);
+  printf("%llu\n", tot);
+}
diff --git a/day18/Makefile b/day18/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day18/common.c b/day18/common.c
@@ -0,0 +1,22 @@
+#include "common.h"
+
+static inline int64_t iabs(const int64_t x) { return x >= 0 ? x : -x; }
+
+int64_t area(const pos_t *cornetto, const size_t n) {
+  size_t i;
+
+  int64_t exterior = 0;
+  for (i = 0; i < n - 1; i++) {
+    exterior += iabs(cornetto[i].x - cornetto[i + 1].x);
+    exterior += iabs(cornetto[i].y - cornetto[i + 1].y);
+  }
+
+  // shoelace formula for interior area
+  int64_t interior = 0;
+  for (i = 0; i < n - 1; i++)
+    interior += (cornetto[i].x * cornetto[i + 1].y) -
+                (cornetto[i + 1].x * cornetto[i].y);
+
+  // compensate error with pick's thm
+  return (iabs(interior) - exterior) / 2 + 1 + exterior;
+}
diff --git a/day18/common.h b/day18/common.h
@@ -0,0 +1,16 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+typedef struct {
+  int64_t x;
+  int64_t y;
+} pos_t;
+
+int64_t area(const pos_t *cornetto, const size_t n);
+
+#endif
diff --git a/day18/exinput b/day18/exinput
@@ -0,0 +1,14 @@
+R 6 (#70c710)
+D 5 (#0dc571)
+L 2 (#5713f0)
+D 2 (#d2c081)
+R 2 (#59c680)
+D 2 (#411b91)
+L 5 (#8ceee2)
+U 2 (#caa173)
+L 1 (#1b58a2)
+U 2 (#caa171)
+R 2 (#7807d2)
+U 3 (#a77fa3)
+L 2 (#015232)
+U 2 (#7a21e3)
diff --git a/day18/input b/day18/input
@@ -0,0 +1,640 @@
+L 4 (#248a72)
+U 3 (#295c13)
+L 4 (#49e802)
+U 5 (#5ff8b3)
+R 3 (#0df642)
+U 2 (#15b973)
+R 5 (#6cfb92)
+U 11 (#4e3cd3)
+L 4 (#422dd0)
+D 5 (#303fe3)
+L 7 (#6225e0)
+D 2 (#58bd63)
+L 9 (#6225e2)
+D 8 (#2b1703)
+L 6 (#422dd2)
+D 9 (#2eb9b3)
+L 2 (#10f270)
+D 10 (#0677b3)
+L 4 (#190450)
+U 11 (#55b4e3)
+L 4 (#361732)
+U 3 (#034663)
+L 4 (#37f902)
+U 6 (#19bb73)
+R 8 (#6e1030)
+U 8 (#4cad93)
+L 4 (#2509d0)
+U 6 (#1e1e61)
+L 5 (#3d3b90)
+U 8 (#28ec81)
+L 2 (#3f9200)
+U 5 (#437871)
+L 6 (#174bc0)
+D 5 (#3b58a1)
+L 11 (#064a60)
+U 5 (#539da3)
+L 4 (#1ea0d0)
+D 7 (#1909b3)
+L 2 (#296a52)
+D 9 (#6780c3)
+L 3 (#296a50)
+U 11 (#356893)
+L 2 (#0eb430)
+U 5 (#019203)
+L 5 (#4eea10)
+U 4 (#436533)
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+R 8 (#2567a0)
+U 3 (#57ee03)
+R 12 (#270540)
+U 2 (#358173)
+R 6 (#289e40)
+U 2 (#77b991)
+R 4 (#016c10)
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+R 2 (#714f90)
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+R 10 (#37f1c2)
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+R 4 (#583cd2)
+D 5 (#4333f3)
+R 5 (#0eb952)
+D 3 (#22a273)
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+R 8 (#40b2c2)
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+L 2 (#40b2c0)
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+R 5 (#226142)
+U 4 (#2740c1)
+R 5 (#41ac62)
+U 3 (#275423)
+R 2 (#3ba072)
+U 11 (#275421)
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+D 8 (#402001)
+R 2 (#3456c0)
+D 6 (#5a4541)
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+U 8 (#3fcdb1)
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+D 7 (#164e43)
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+D 5 (#3beca3)
+R 6 (#7445e0)
+U 3 (#2cda83)
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+U 3 (#475553)
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+R 6 (#05da32)
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+R 5 (#41f750)
+D 8 (#1f4191)
+R 3 (#3530f0)
+D 13 (#4d3941)
+R 3 (#6215e0)
+D 9 (#2fe911)
+R 6 (#05cf90)
+U 4 (#25c901)
+R 2 (#335232)
+U 12 (#271371)
+R 2 (#335230)
+U 5 (#2bd1d1)
+L 9 (#1ffad0)
+U 6 (#6f6bc1)
+R 9 (#099600)
+U 5 (#13bee1)
+R 3 (#5aa820)
+U 3 (#3546c1)
+R 6 (#4dd5f0)
+D 11 (#495be1)
+R 6 (#60c8e0)
+U 11 (#4bd201)
+R 4 (#367f30)
+D 4 (#43dbc1)
+R 6 (#4bb740)
+U 12 (#07ce11)
+R 6 (#4b4d70)
+D 12 (#3e29e1)
+R 5 (#313fc0)
+U 4 (#293d51)
+R 4 (#1b4860)
+U 11 (#514571)
+R 4 (#5c11a2)
+U 4 (#444841)
+R 8 (#5c11a0)
+U 2 (#3e6c51)
+R 11 (#16dab0)
+U 7 (#26baf1)
+R 2 (#32e240)
+U 5 (#26baf3)
+R 6 (#2f0a70)
+U 6 (#11a821)
+R 3 (#527fc0)
+U 7 (#468b31)
+R 6 (#0641a0)
+U 10 (#20f351)
+R 7 (#547a90)
+U 12 (#1dbf11)
+R 2 (#17d0d2)
+U 10 (#159981)
+R 6 (#634e12)
+U 5 (#4ff021)
+R 10 (#006122)
+D 6 (#6589a3)
+R 3 (#1a74f2)
+D 2 (#19b911)
+R 12 (#3ed5f2)
+D 5 (#28ab31)
+R 3 (#09dd82)
+D 5 (#614c01)
+R 6 (#284d32)
+D 9 (#06b521)
+R 8 (#4dfad2)
+D 7 (#5b0f61)
+R 2 (#0fff22)
+D 5 (#1e6ff1)
+R 2 (#47b352)
+D 9 (#29c291)
+R 5 (#352ef2)
+D 3 (#042d11)
+R 4 (#262542)
+D 7 (#042d13)
+R 4 (#21e8f2)
+D 3 (#18cc21)
+R 3 (#16ed70)
+U 9 (#270ea1)
+R 7 (#4391e0)
+U 9 (#270ea3)
+R 4 (#22bdd0)
+D 3 (#3b72b1)
+R 7 (#1fd4b2)
+D 8 (#01bfe1)
+L 7 (#3d18a2)
+D 7 (#20dac1)
+R 4 (#67d990)
+D 4 (#1acd93)
+L 7 (#017410)
+D 2 (#6e4923)
+L 7 (#10bdd0)
+D 13 (#0650b3)
+L 2 (#072660)
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+L 6 (#41d720)
+D 3 (#5bc831)
+L 4 (#252450)
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+D 4 (#247721)
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+D 3 (#4fdc91)
+R 2 (#470c40)
+D 8 (#189db1)
+L 5 (#4a1f70)
+D 7 (#07e141)
+L 3 (#2524b0)
+D 5 (#2a6ce1)
+L 11 (#1a2e50)
+D 2 (#4f08c1)
+L 3 (#3b7ec0)
+D 9 (#65e011)
+L 8 (#24b9a0)
+D 6 (#196c61)
+L 5 (#540b20)
+D 6 (#243801)
+L 2 (#397ce0)
+D 3 (#411a41)
+L 12 (#397ce2)
+D 2 (#526d51)
+L 2 (#5b5810)
+D 5 (#2e96d3)
+L 8 (#6c4f80)
+U 6 (#274453)
+L 3 (#077010)
+U 5 (#37f603)
+R 5 (#73bf92)
+U 4 (#29ee73)
+R 11 (#5ffd40)
+U 5 (#3e12d3)
+L 4 (#4b4e32)
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+L 2 (#45d0b2)
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+D 3 (#3d9e13)
+L 11 (#305450)
+D 6 (#2667f3)
+L 7 (#3a8470)
+D 8 (#293191)
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+D 4 (#2667f1)
+R 7 (#250ee0)
+U 4 (#70e1c3)
+R 4 (#2907d0)
+D 6 (#0b69a1)
+R 6 (#3babc0)
+D 6 (#7698c3)
+R 2 (#2752c0)
+D 3 (#7698c1)
+L 4 (#2dc550)
+D 11 (#4ec121)
+L 8 (#199d00)
+U 11 (#33f261)
+L 7 (#3b4e30)
+D 5 (#24e991)
+L 6 (#0aaeb2)
+U 9 (#15a993)
+L 5 (#59ed02)
+U 2 (#15a991)
+L 5 (#2c0432)
+U 10 (#337e81)
+L 7 (#248670)
+D 2 (#511d31)
+L 3 (#52ebc0)
+D 13 (#511d33)
+L 4 (#192db0)
+D 7 (#3dcf11)
+L 2 (#285030)
+D 3 (#15acc1)
+L 6 (#3a6c70)
+D 5 (#36f281)
+L 4 (#44fd02)
+U 5 (#4e8821)
+L 4 (#473972)
+U 5 (#2ab9f1)
+L 8 (#60aaa0)
+U 5 (#35c651)
+L 3 (#4736b2)
+U 10 (#4741d1)
+L 3 (#1973f2)
+U 5 (#1b5031)
+L 3 (#3c6532)
+D 5 (#49bd31)
+L 4 (#5e3f60)
+D 3 (#4a2011)
+L 4 (#2ba190)
+D 6 (#4a2013)
+L 3 (#653430)
+D 7 (#10dda1)
+L 11 (#2532d2)
+D 3 (#675311)
+L 4 (#27d642)
+D 6 (#02cae1)
+L 10 (#466652)
+D 7 (#34cef3)
+R 3 (#263692)
+D 7 (#34cef1)
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+D 5 (#31afe1)
+L 8 (#091562)
+D 5 (#12c861)
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+D 5 (#68a5b1)
+L 7 (#1f79a2)
+D 4 (#3b3c13)
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+D 4 (#087363)
+R 4 (#3e26c2)
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+R 3 (#5ac862)
+U 3 (#4953f1)
+R 3 (#13cfe2)
+D 5 (#087361)
+R 11 (#57f7a2)
+D 4 (#3b3c11)
+L 11 (#6dcb32)
+D 7 (#35e653)
+R 6 (#525282)
+D 5 (#3dac93)
+R 9 (#377082)
+D 6 (#2afda1)
+R 10 (#3e6422)
+D 10 (#220471)
+R 10 (#37ebf2)
+D 2 (#4d0213)
+R 5 (#2fa2f2)
+D 4 (#30df53)
+R 5 (#617e00)
+U 6 (#536393)
+R 5 (#496510)
+D 6 (#5f6733)
+R 4 (#3bf9b0)
+D 3 (#5f6731)
+R 4 (#48d940)
+D 3 (#35a5d3)
+R 4 (#284a82)
+D 9 (#445b23)
+L 4 (#2535c2)
+D 4 (#3f8b43)
+R 2 (#41a002)
+D 7 (#20b143)
+R 3 (#63ae42)
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+R 9 (#383210)
+U 3 (#1ce143)
+R 7 (#383212)
+U 6 (#2ed603)
+R 5 (#00c512)
+U 6 (#6dea43)
+R 6 (#00c510)
+U 7 (#0f0643)
+R 3 (#4292a2)
+U 7 (#684961)
+R 3 (#03de80)
+U 5 (#46e0b1)
+R 6 (#3d4ae2)
+D 5 (#1d5fc1)
+R 7 (#3d4ae0)
+U 13 (#470ab1)
+R 5 (#03de82)
+U 4 (#282c71)
+R 6 (#5520f2)
+D 5 (#2f0981)
+R 2 (#5520f0)
+D 12 (#4081a1)
+R 6 (#22a272)
+U 5 (#284c53)
+R 8 (#081202)
+D 5 (#0b7831)
+R 4 (#3e4552)
+D 13 (#0b7833)
+R 5 (#38e092)
+U 11 (#284c51)
+R 2 (#550082)
+U 2 (#175033)
+R 6 (#036dc2)
+D 3 (#068791)
+R 9 (#3ff6f2)
+D 5 (#4a5783)
+R 13 (#4d5f92)
+D 6 (#3e3423)
+L 12 (#4f62d2)
+D 7 (#5e4363)
+L 3 (#0f7032)
+U 7 (#285261)
+L 12 (#4ea392)
+D 5 (#4c2dc1)
+L 4 (#0d2822)
+D 5 (#4c2dc3)
+R 9 (#518da2)
+D 2 (#41b3b1)
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+D 3 (#13d6e1)
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+D 3 (#2026c1)
+R 4 (#68f3a0)
+D 7 (#2026c3)
+L 8 (#208470)
+D 4 (#09bd81)
+L 3 (#193a10)
+D 7 (#5f3491)
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+D 2 (#10d1e1)
+R 5 (#3fd582)
+D 5 (#5025a1)
+L 3 (#381b70)
+D 11 (#771831)
+L 7 (#2abf50)
+U 11 (#17be81)
+L 5 (#1eb3c0)
+D 5 (#3d9c61)
+L 5 (#5f4de2)
+D 8 (#278361)
+L 2 (#2b95b2)
+D 9 (#2cb0b1)
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+D 6 (#2c6bb3)
+L 2 (#499642)
+D 5 (#4c76d3)
+L 8 (#2fe412)
+U 9 (#07b893)
+L 2 (#236d52)
+U 8 (#3956a3)
+L 7 (#34f252)
+U 3 (#52bbf1)
+L 7 (#189470)
+U 4 (#54b661)
+L 9 (#189472)
+U 7 (#0110f1)
+L 3 (#409bf2)
+U 3 (#46d3e3)
+L 5 (#4c0f82)
+U 11 (#215e73)
+L 4 (#4c0f80)
+U 7 (#4050f3)
+L 9 (#39b192)
+U 7 (#28b043)
+L 3 (#011270)
+U 7 (#1f6693)
+R 7 (#73c390)
+U 2 (#2c4113)
+R 5 (#0321c0)
+U 8 (#2f2903)
+L 12 (#5ab560)
+U 3 (#4dd983)
+L 6 (#38b7d2)
+U 12 (#03c8c3)
diff --git a/day18/uppga.c b/day18/uppga.c
@@ -0,0 +1,48 @@
+#include "common.h"
+
+#define MAXCORNERS 2048
+
+static inline pos_t to_move(const char dir, const int64_t n) {
+  pos_t res;
+  switch (dir) {
+  case 'U':
+    res = (pos_t){0, n};
+    break;
+  case 'R':
+    res = (pos_t){n, 0};
+    break;
+  case 'D':
+    res = (pos_t){0, -n};
+    break;
+  case 'L':
+    res = (pos_t){-n, 0};
+    break;
+  }
+  return res;
+}
+
+int main() {
+  pos_t cornetto[MAXCORNERS];
+  cornetto[0].x = 0;
+  cornetto[0].y = 0;
+  size_t ncornetto = 1;
+  FILE *f = fopen("input", "r");
+  char col[8];
+  col[7] = '\0';
+  char dir;
+  int64_t n;
+
+  while (ncornetto < MAXCORNERS &&
+         fscanf(f, "%c %lld (%7s)\n", &dir, &n, &col) != EOF) {
+    pos_t move = to_move(dir, n);
+    cornetto[ncornetto].x = cornetto[ncornetto - 1].x + move.x;
+    cornetto[ncornetto].y = cornetto[ncornetto - 1].y + move.y;
+    ncornetto++;
+  }
+  assert(ncornetto < MAXCORNERS);
+
+  int64_t a = area(cornetto, ncornetto);
+  printf("area = %lld\n", a);
+
+  fclose(f);
+}
diff --git a/day18/uppgb.c b/day18/uppgb.c
@@ -0,0 +1,65 @@
+#include "common.h"
+
+#define MAXCORNERS 2048
+
+static inline int64_t hex_to_n(const char *s, const size_t n) {
+  size_t i;
+  int64_t r = 0;
+
+  for (i = 0; i < n; i++) {
+    assert(('0' <= s[i] && s[i] <= '9') || ('a' <= s[i] && s[i] <= 'f'));
+    r <<= 4;
+    if (s[i] <= '9')
+      r += (int64_t)(s[i] - '0');
+    else
+      r += (int64_t)(s[i] - 'a') + 10;
+  }
+
+  return r;
+}
+
+static inline pos_t to_move(const char *s) {
+  pos_t res;
+  int64_t n = hex_to_n(&s[1], 5);
+  switch (s[6]) {
+  case '0':
+    res = (pos_t){n, 0};
+    break;
+  case '1':
+    res = (pos_t){0, -n};
+    break;
+  case '2':
+    res = (pos_t){-n, 0};
+    break;
+  case '3':
+    res = (pos_t){0, n};
+    break;
+  }
+  return res;
+}
+
+int main() {
+  pos_t cornetto[MAXCORNERS];
+  cornetto[0].x = 0;
+  cornetto[0].y = 0;
+  size_t ncornetto = 1;
+  FILE *f = fopen("input", "r");
+  char col[8];
+  col[7] = '\0';
+  char dir;
+  int64_t n;
+
+  while (ncornetto < MAXCORNERS &&
+         fscanf(f, "%c %lld (%7s)\n", &dir, &n, &col) != EOF) {
+    pos_t move = to_move(col);
+    cornetto[ncornetto].x = cornetto[ncornetto - 1].x + move.x;
+    cornetto[ncornetto].y = cornetto[ncornetto - 1].y + move.y;
+    ncornetto++;
+  }
+  assert(ncornetto < MAXCORNERS);
+
+  int64_t a = area(cornetto, ncornetto);
+  printf("area = %lld\n", a);
+
+  fclose(f);
+}
diff --git a/day19/Makefile b/day19/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o ../utils/sd.o ../utils/stack_sd.o ../utils/dict.o ../utils/stack_u64.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day19/common.c b/day19/common.c
@@ -0,0 +1,107 @@
+#include "common.h"
+#include "reading.h"
+
+void print_dict(dict_t *d) {
+  size_t i, j;
+
+  for (i = 0; i < d->nalloc; i++) {
+    for (j = 0; j < (d->keys[i]).nmemb; j++) {
+      printf("%s: ", (d->keys[i]).data[j].data);
+      size_t x = *((size_t *)(d->values[i]).data[j]);
+      printf("%llu\n", x);
+    }
+  }
+}
+
+static inline size_t cadd(dict_t *d, char *name) {
+  sd sdname;
+  sd_init_str(&sdname, name);
+  void *p = dict_lookup(d, sdname);
+
+  if (p == NULL) {
+    size_t r = d->nelts;
+    size_t *v = malloc(sizeof(*v));
+    *v = r;
+
+    dict_insert(d, sdname, v);
+
+    return r;
+  }
+
+  return *((size_t *)p);
+}
+
+static inline void parseconds(cond_t *cds, dict_t *d, char *conds, size_t row) {
+  size_t ncds = 0;
+  char *ss = strtok(conds, ",");
+  while (ss != NULL) {
+    if (strstr(ss, ":")) {
+      int64_t x;
+      char *cp = sread_next_i64(&x, ss) + 1;
+      size_t i = cadd(d, cp);
+
+      cds[ncds].from = row;
+      cds[ncds].to = i;
+      switch (ss[0]) {
+      case 'x':
+        cds[ncds].entry = 0;
+        break;
+      case 'm':
+        cds[ncds].entry = 1;
+        break;
+      case 'a':
+        cds[ncds].entry = 2;
+        break;
+      default:
+        cds[ncds].entry = 3;
+      }
+      cds[ncds].cond = ss[1];
+      cds[ncds].bound = x;
+      ncds++;
+    } else {
+      cds[ncds].from = row;
+      cds[ncds].cond = '!';
+      cds[ncds].bound = -1;
+      cds[ncds].to = cadd(d, ss);
+      ncds++;
+    }
+    ss = strtok(NULL, ",");
+  }
+}
+
+stack_u64 *parse(dict_t *d, size_t *nconds, cond_t **r, char **lines,
+                 size_t nlines) {
+  size_t i;
+  for (i = 0; i < nlines; i++) {
+    if (strlen(lines[i]) < 2)
+      break;
+    char *sa = strtok(lines[i], "{}");
+    size_t row = cadd(d, sa);
+    char *ss = sa;
+    while (ss != NULL) {
+      ss = strtok(NULL, "{}");
+      parseconds(r[i], d, ss, row);
+    }
+  }
+
+  *nconds = i;
+
+  stack_u64 *values = malloc(4 * sizeof(*values));
+  for (i = 0; i < 4; i++)
+    stack_u64_init(&values[i]);
+
+  for (i = *nconds + 1; i < nlines; i++) {
+    char *cp = lines[i];
+    uint64_t tmp;
+    cp = sread_next_u64(&tmp, cp);
+    stack_u64_push(&values[0], tmp);
+    cp = sread_next_u64(&tmp, cp);
+    stack_u64_push(&values[1], tmp);
+    cp = sread_next_u64(&tmp, cp);
+    stack_u64_push(&values[2], tmp);
+    cp = sread_next_u64(&tmp, cp);
+    stack_u64_push(&values[3], tmp);
+  }
+
+  return values;
+}
diff --git a/day19/common.h b/day19/common.h
@@ -0,0 +1,28 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <dict.h>
+#include <reading.h>
+#include <stack_u64.h>
+
+#define MAX_NEQ 512
+
+typedef struct {
+  size_t from;
+  size_t to;
+
+  size_t entry;
+  char cond;
+  int64_t bound;
+} cond_t;
+
+stack_u64 *parse(dict_t *d, size_t *nconds, cond_t **r, char **lines,
+                 size_t nlines);
+void print_dict(dict_t *d);
+
+#endif
diff --git a/day19/exinput b/day19/exinput
@@ -0,0 +1,17 @@
+px{a<2006:qkq,m>2090:A,rfg}
+pv{a>1716:R,A}
+lnx{m>1548:A,A}
+rfg{s<537:gd,x>2440:R,A}
+qs{s>3448:A,lnx}
+qkq{x<1416:A,crn}
+crn{x>2662:A,R}
+in{s<1351:px,qqz}
+qqz{s>2770:qs,m<1801:hdj,R}
+gd{a>3333:R,R}
+hdj{m>838:A,pv}
+
+{x=787,m=2655,a=1222,s=2876}
+{x=1679,m=44,a=2067,s=496}
+{x=2036,m=264,a=79,s=2244}
+{x=2461,m=1339,a=466,s=291}
+{x=2127,m=1623,a=2188,s=1013}
diff --git a/day19/input b/day19/input
@@ -0,0 +1,707 @@
+mxd{s>519:A,A}
+mjc{s>2178:R,R}
+fn{s<595:A,x<2401:R,m<3068:A,A}
+kvf{a<3294:R,s<1556:dxz,ks}
+hds{s>2669:R,s>2466:A,x>551:R,R}
+gs{m<360:zd,gx}
+grj{m<1473:A,x<458:R,R}
+kp{s>435:R,R}
+smm{s<3630:R,s>3642:R,R}
+kph{m>1270:A,x>1603:A,m>1212:A,A}
+nds{a>121:A,a>56:R,R}
+ctd{a>1355:A,s<3418:A,s>3430:R,fbg}
+hm{s<3783:R,a<915:A,s<3899:A,A}
+fd{x>1077:R,s<1020:dm,s<1296:A,nhn}
+vn{s>2595:A,s<2499:R,x<2900:R,xp}
+hcd{a>861:kb,s>2244:lb,R}
+dtz{s<2555:R,A}
+mfl{a>1580:klc,R}
+hv{x<2511:R,x>2650:R,R}
+pzq{m<957:rtd,m<1311:R,s>736:vsr,vz}
+jbh{x<1440:R,s>2176:A,R}
+bp{s<2134:R,a>423:A,a<148:A,A}
+nhn{a<1115:A,A}
+qk{a<940:mms,m<3456:A,dg}
+zrz{x>3467:tjz,a<3096:hmq,bnj}
+cpz{m<3765:A,m>3881:R,x>3232:A,R}
+kb{x<589:R,x<854:A,R}
+xss{s>2931:tx,s>2577:A,ptf}
+ljb{a>1580:A,a>1518:A,A}
+bl{a<1603:nps,bdf}
+gd{x>2903:rvd,m>2692:qqz,s<1587:tcm,xhj}
+cnm{x>3317:A,a<2446:A,a>2972:A,A}
+dxd{x>3626:A,x>3578:A,x<3558:R,R}
+kt{a<2459:jg,a<3181:pg,x>1274:mtm,zh}
+qr{s>1547:R,x>2576:R,x<2219:A,R}
+tbb{s>3694:A,m>3236:tgn,dc}
+mjx{s>1488:A,x>2441:R,rq}
+slz{s>3682:kng,A}
+xl{a>2352:R,R}
+zn{x>499:R,m>520:A,A}
+vc{x>2938:R,a>1346:A,A}
+nc{x>2666:dvd,xzx}
+pml{m<2772:ml,nsx}
+rtf{a<325:A,a<520:A,m>1148:R,A}
+rd{m>1726:kn,a>1532:vn,x<2966:brb,xfh}
+kkh{s>1789:A,A}
+jsj{a>1984:lch,m>2372:xss,hk}
+cnr{s<1910:R,m>3349:R,A}
+dxz{s>1400:A,R}
+sh{s<3261:R,m>337:A,m<262:A,R}
+tfm{a<1214:R,m>527:A,x>1422:A,R}
+fq{m<887:R,m<1036:A,m<1112:R,A}
+fl{s>1735:R,s>1721:A,R}
+sfp{m<2598:A,s<2962:A,A}
+hff{m<3389:pnx,s>1790:jnf,qk}
+rbf{m<291:mb,x<1523:dtz,mp}
+db{m<859:A,A}
+ck{x>2345:A,A}
+lgr{x<3690:dxd,A}
+xp{x>3015:R,a>2631:R,A}
+vtv{m<2179:hcd,gl}
+tq{x>2684:A,x>2429:R,m<2407:npq,R}
+ppc{x<2658:A,m>2166:A,R}
+hk{s<2925:ck,A}
+gqp{x<2320:R,a>2596:A,m<2142:R,A}
+pgj{s<3781:kdt,m>2547:nq,a<1362:xfb,rz}
+mp{a>2394:dfx,A}
+vh{a<376:R,R}
+hb{m>3496:R,m<3482:R,s<1786:A,A}
+zp{x>502:hm,blv}
+gf{s>3664:A,m>3751:A,A}
+tg{m<1097:A,s<2083:gv,A}
+cz{m>948:A,x>1835:hp,A}
+fqr{a<3412:lp,mld}
+bc{m>770:R,s<234:hx,zhv}
+mcz{m<399:ndb,sf}
+pb{s<3639:vg,xv}
+drn{x<2337:jzj,a>2468:ps,s<1692:rh,sjn}
+lxd{a>1948:jzc,sfp}
+ktn{x>3118:rf,x<2569:rcn,a<1483:qmv,bl}
+kbn{s<1896:A,A}
+sgg{a<3024:md,x<3474:cpz,s>1888:nf,gcs}
+zz{x>2261:fn,a<2097:jlc,a<3041:R,mxd}
+rhc{s<1222:jfr,m<717:zsg,x<3086:dnh,lt}
+gz{s>1877:hjf,x>2844:A,m<1240:R,csz}
+gj{a<3514:R,krn}
+dmb{x<3801:lgr,lzf}
+mg{a<826:A,s>2329:A,A}
+rg{a<3454:R,m<3961:R,R}
+tdn{a>636:A,x>2674:A,a<418:A,A}
+pk{s>1111:A,a<1136:R,A}
+jj{a<693:A,s<2070:R,x<3277:R,A}
+fcm{s<1672:A,a>2998:R,R}
+xsx{x>1604:pk,x>1286:pzl,fd}
+mzg{m>3808:A,s>1865:gb,R}
+fg{a>2650:dh,a<1401:R,a>2074:R,A}
+tz{a>1106:cx,m>3282:btl,s>2141:qj,df}
+ll{s>3709:ppc,m>2043:hmt,s<3670:R,A}
+cx{s<2250:A,s>2317:rs,a<1440:pnm,ljb}
+fgz{s>1826:A,A}
+gx{x>1640:R,x<1380:A,x>1501:A,R}
+mxx{x<1623:R,a<1522:R,m>996:R,R}
+pmr{s>2942:A,x<3819:A,a>2520:R,R}
+sj{a<406:A,A}
+nhv{a<2366:nx,x>3240:A,fl}
+hf{s>1092:jml,a<1133:R,s>902:ghr,A}
+fvm{s>2186:R,a<746:pxt,R}
+zq{s>2330:R,A}
+jzj{s>1843:cnr,x<2093:znr,m>3323:A,hvr}
+bpc{a>3794:R,R}
+tkk{m>2092:R,R}
+rb{x>2846:R,R}
+ql{a>1897:R,R}
+gv{m<1131:A,x<1429:A,x>1526:R,A}
+ncr{s<2301:R,R}
+xv{s<3816:ll,s<3897:rbn,st}
+hnd{a<2278:nns,m<870:R,A}
+bqz{s<2364:A,R}
+fp{s<726:rl,kt}
+ltb{a>1269:A,x>777:A,x<658:A,R}
+pxt{s>1993:A,R}
+zx{a>796:R,A}
+jvs{a<3103:A,s<1870:A,A}
+rsm{s>2707:A,x<835:R,A}
+xpx{a>607:R,s<2014:A,A}
+fqk{m<912:A,A}
+nrx{x<376:kbn,vs}
+brb{m>708:cxk,R}
+gcs{s<1809:A,s>1841:R,m<3834:A,R}
+rkk{s<1770:A,m>3321:A,A}
+fr{a>2675:A,s>522:A,R}
+xfb{s>3857:lfr,a<683:vh,s>3818:dr,nlf}
+ddk{a>1547:rr,jk}
+rvf{s<1673:mrn,x>1239:kf,jnk}
+dvp{a<3744:hs,s<2210:R,s<2319:A,txk}
+vx{x>1553:ht,x<1391:A,A}
+ml{s>2170:vcq,rb}
+mbl{m>3905:A,A}
+qfs{m<1155:nhz,hh}
+mkc{m<2142:R,s>3264:R,A}
+xj{a<1868:R,x>3465:R,R}
+bj{m<3328:R,R}
+hp{a<2543:R,x<1887:R,s<2030:R,R}
+jzc{x<2727:A,x<2778:R,R}
+kch{m>3627:R,R}
+bsl{x>3681:R,s<1591:A,R}
+nps{a<1538:A,R}
+dsc{a>714:A,m<374:R,a>341:R,A}
+tm{a>2000:xqv,a>1222:rgk,rhc}
+gnv{x>752:fqr,s<3125:zhc,xjg}
+rr{a<3101:R,A}
+lx{s>3010:bz,mfl}
+sjn{x<2761:hv,s>1824:bj,x<2926:A,rkk}
+rc{s<2605:qmc,m<869:R,m<895:R,fqk}
+xct{m>2544:R,A}
+mq{a<1980:A,m>1455:R,x<3654:A,A}
+lp{a>2759:A,s>2867:A,R}
+hsv{x<2410:R,a<1560:A,R}
+jg{m>2929:lkf,x>1020:xhc,s>1167:jgp,A}
+mrl{m<1092:A,A}
+vg{s>3504:sps,x>3181:tr,s<3449:ctd,hfg}
+sv{x<2066:R,a<849:R,a<1058:A,R}
+srk{a>1926:R,a>896:mc,jdq}
+tj{x>1519:R,R}
+fbg{a>773:R,a<489:R,m<2598:R,R}
+fj{m>1112:A,A}
+bb{m<726:A,R}
+fm{x<1701:R,a<2535:A,R}
+npq{a<3739:A,x<2236:A,R}
+zj{x>2673:jcd,zrb}
+qq{s<1726:A,s>1888:R,s<1833:R,R}
+zhv{a<1161:A,a<1955:R,m>297:A,R}
+lt{a>784:tpp,s>1791:nmv,m<1272:grb,ssv}
+gt{m>1318:A,R}
+xhs{m<2996:R,m<3102:A,A}
+bjb{m>936:lr,x>1510:rc,hnd}
+rtd{s>556:A,m>564:A,R}
+qqz{s<1611:A,m>2941:A,pt}
+pnn{s<3780:R,s>3867:A,a>1248:zn,R}
+jlc{a<772:A,m<2926:R,s<614:A,A}
+zrb{s>750:nrc,s<378:lcv,zz}
+vfg{s<2430:R,cms}
+cms{a>3222:A,m>583:R,x<406:A,A}
+vcq{m>2434:A,a>2745:R,s<2311:A,R}
+xrv{a<1662:qgp,x<3696:xg,tgr}
+hxt{s>1068:fsf,x>3036:xj,s<679:sdh,cbc}
+srt{m>2894:dvp,s<2153:tq,s>2284:scj,nhs}
+mpd{a>628:R,a<214:A,x<1355:A,A}
+rml{a<504:A,A}
+tb{m>3398:R,s>1543:A,a<3609:A,R}
+ptr{m>688:R,a<948:R,s<634:A,A}
+klc{x<1710:R,a<2591:A,m>3078:A,R}
+ks{s<1651:R,x>2702:A,s>1697:R,A}
+xhc{s<1351:R,R}
+fh{s<3401:kq,pb}
+rqn{m<1266:mpd,x>1369:R,gt}
+cs{x>564:mm,x<218:tlj,gqv}
+jt{x>2871:A,m<3444:A,a<1753:R,A}
+hjf{m>1046:A,m>370:A,s>1968:A,A}
+nrc{m<2804:lm,xq}
+sz{x>2574:A,R}
+qbv{m>249:A,s>574:A,R}
+pfp{m>375:R,A}
+btq{a<998:flp,m>3485:prd,bqz}
+gp{a<2326:dp,ms}
+pfl{s<1868:R,a<1886:R,a<1950:R,R}
+spt{m<1224:pnn,m>1788:zp,lft}
+jfr{a<775:pzq,fz}
+lc{s<1767:qv,x<3091:mzg,a>2124:sgg,jgb}
+jnk{a>2431:gnv,s>2865:kfx,kv}
+md{m<3718:A,A}
+bdf{x>2867:R,m>409:R,m<263:R,R}
+pzl{s>745:fk,m<858:tfm,pv}
+tp{a<2486:A,x<3506:A,s<2745:R,A}
+krn{m>1248:R,x<3069:R,a>3769:R,R}
+nth{m>897:grj,gkv}
+mtm{m>3187:kch,x<1564:R,vcj}
+nlf{a>980:A,s>3799:A,x<675:A,R}
+kv{m<1769:nth,m<2749:vtv,btq}
+ns{x<3280:R,s>2163:A,m<3814:A,A}
+dt{a<1402:A,s>1581:A,R}
+rcd{s<667:R,a>1341:A,A}
+lf{m>1315:R,a<599:A,sv}
+vf{m<3625:zlg,x>887:gf,m<3771:A,A}
+bst{m>2531:R,x>975:A,s>3379:A,R}
+nxj{a<2198:R,A}
+kng{a>1758:A,x<811:A,s<3709:A,A}
+lkf{m<3494:A,x<1200:A,s<1219:A,A}
+sps{s<3575:scm,x>3109:mq,hsv}
+pvf{m>143:fm,s>3306:R,qp}
+zm{x<3406:R,s>1900:A,A}
+ltd{s>3415:nxj,A}
+kg{m>620:R,x<1505:mnf,A}
+zsg{x<3003:rt,mcz}
+rvd{m<2705:cnm,a>2203:jr,m>2882:xhs,R}
+hl{s>3663:R,A}
+tld{a>1063:A,a>955:A,x<2857:A,A}
+rbn{s>3864:pq,m<1667:xd,R}
+jsl{x>1423:A,R}
+sx{m>103:A,a>1372:A,a<646:A,R}
+zd{x<1679:th,s>3668:kdv,R}
+tng{s>3386:A,s>3265:A,R}
+ndb{s>1881:R,A}
+pbc{m>2958:A,a<161:R,x>2337:R,R}
+bz{x<1717:nt,s>3541:A,R}
+pg{x<748:A,x<1189:A,R}
+qj{x<2963:ncr,s<2293:A,zg}
+pq{m>1496:A,x<3163:A,s<3885:A,R}
+ps{a<3453:bbm,x>2688:cvs,s>1696:bpc,A}
+vr{s<354:R,x>3463:A,A}
+txk{m<3329:R,R}
+pd{a>3073:A,m<2888:R,a>2488:R,R}
+cvs{a<3678:A,m<3350:A,A}
+rfd{a>2749:gj,s<2064:gz,s<2237:dv,lhj}
+rs{s>2347:R,A}
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+{x=286,m=2539,a=196,s=537}
+{x=634,m=575,a=1300,s=836}
+{x=653,m=2299,a=2516,s=2252}
+{x=1897,m=815,a=312,s=12}
+{x=108,m=622,a=425,s=605}
+{x=2906,m=387,a=730,s=2323}
+{x=3,m=1920,a=727,s=430}
+{x=1525,m=2819,a=1426,s=1662}
+{x=109,m=799,a=318,s=208}
+{x=526,m=1332,a=2025,s=221}
+{x=222,m=1040,a=2630,s=2804}
+{x=69,m=222,a=214,s=2401}
+{x=28,m=1905,a=1349,s=738}
+{x=1309,m=109,a=656,s=1085}
+{x=418,m=113,a=1640,s=1816}
+{x=3359,m=236,a=2,s=23}
+{x=1210,m=595,a=2850,s=1716}
+{x=239,m=103,a=2064,s=74}
+{x=695,m=692,a=1143,s=1811}
+{x=1293,m=915,a=1941,s=566}
+{x=526,m=424,a=180,s=1076}
+{x=142,m=358,a=2591,s=2768}
+{x=2210,m=107,a=15,s=556}
+{x=708,m=544,a=1873,s=1891}
+{x=2495,m=554,a=128,s=23}
+{x=685,m=33,a=1516,s=982}
+{x=423,m=5,a=1000,s=1720}
+{x=2827,m=831,a=746,s=821}
+{x=416,m=68,a=538,s=1106}
+{x=150,m=1049,a=336,s=444}
+{x=121,m=799,a=548,s=145}
+{x=3461,m=3082,a=807,s=1205}
+{x=797,m=347,a=222,s=197}
+{x=1318,m=978,a=2614,s=1001}
+{x=2011,m=1317,a=161,s=1171}
+{x=13,m=204,a=881,s=838}
+{x=1126,m=2843,a=1405,s=277}
+{x=3093,m=796,a=1817,s=34}
+{x=2207,m=408,a=350,s=523}
+{x=1825,m=115,a=957,s=2567}
+{x=402,m=3773,a=2272,s=269}
+{x=393,m=224,a=169,s=109}
+{x=1594,m=28,a=1453,s=851}
+{x=1193,m=3463,a=248,s=3253}
+{x=1760,m=1054,a=361,s=1020}
+{x=2628,m=632,a=953,s=186}
+{x=566,m=965,a=2764,s=1}
+{x=694,m=2976,a=1084,s=128}
+{x=1239,m=29,a=3522,s=713}
+{x=220,m=152,a=708,s=876}
+{x=978,m=803,a=1013,s=43}
+{x=1515,m=927,a=2182,s=1121}
+{x=2695,m=1511,a=1138,s=8}
+{x=168,m=1231,a=176,s=719}
+{x=507,m=125,a=1519,s=2347}
+{x=1419,m=182,a=1705,s=806}
+{x=1673,m=46,a=1494,s=1888}
+{x=243,m=2688,a=251,s=645}
+{x=2502,m=121,a=11,s=499}
+{x=677,m=473,a=503,s=313}
+{x=1337,m=1294,a=796,s=308}
+{x=1002,m=545,a=491,s=1120}
+{x=427,m=2097,a=875,s=1445}
+{x=102,m=1611,a=851,s=299}
+{x=292,m=1248,a=2702,s=1652}
+{x=238,m=2250,a=94,s=455}
+{x=658,m=1188,a=550,s=833}
+{x=12,m=1659,a=511,s=1834}
+{x=601,m=985,a=43,s=591}
+{x=1740,m=1657,a=532,s=854}
+{x=212,m=1432,a=3425,s=16}
+{x=1337,m=7,a=1973,s=1675}
+{x=1734,m=3260,a=933,s=1438}
+{x=220,m=402,a=338,s=169}
+{x=228,m=1134,a=688,s=1626}
+{x=336,m=1293,a=61,s=453}
+{x=68,m=601,a=563,s=2913}
+{x=2261,m=331,a=617,s=1674}
+{x=144,m=107,a=1741,s=665}
+{x=301,m=207,a=2263,s=37}
+{x=1007,m=2727,a=323,s=1823}
+{x=193,m=3683,a=43,s=167}
diff --git a/day19/uppga.c b/day19/uppga.c
@@ -0,0 +1,95 @@
+#include "common.h"
+
+// linear search for indices is really, really terrible,
+// but I just want to get to part b now...
+static inline size_t coi(size_t c, cond_t **co, size_t ncond) {
+  size_t i;
+  for (i = 0; i < ncond; i++) {
+    if (co[i][0].from == c)
+      return i;
+  }
+  return SIZE_MAX;
+}
+
+typedef struct {
+  uint64_t v[4];
+} part_t;
+
+static inline int part_satisfies(part_t x, cond_t c) {
+  switch (c.cond) {
+  case '<':
+    return x.v[c.entry] < (uint64_t)c.bound;
+  case '>':
+    return x.v[c.entry] > (uint64_t)c.bound;
+  default:
+    assert(c.cond == '=');
+    return x.v[c.entry] == (uint64_t)c.bound;
+  }
+}
+
+static inline int check_part_recurse(part_t x, cond_t **co, size_t ncond,
+                                     size_t current, size_t accepted,
+                                     size_t rejected) {
+  if (current == accepted)
+    return 1;
+  if (current == rejected)
+    return 0;
+
+  size_t cnt = coi(current, co, ncond);
+
+  size_t j = 0;
+  while (co[cnt][j].bound != -1) {
+    if (part_satisfies(x, co[cnt][j])) {
+      return check_part_recurse(x, co, ncond, co[cnt][j].to, accepted,
+                                rejected);
+    }
+    j++;
+  }
+  return check_part_recurse(x, co, ncond, co[cnt][j].to, accepted, rejected);
+}
+
+static inline int check_part(part_t x, cond_t **co, size_t nconds,
+                             size_t accepted, size_t rejected, size_t in) {
+  return check_part_recurse(x, co, nconds, in, accepted, rejected);
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+  size_t i, nconds;
+
+  cond_t *co[nlines];
+  for (i = 0; i < nlines; i++)
+    co[i] = malloc(sizeof(*co[i]) * 512);
+
+  dict_t names;
+  dict_init(&names);
+  stack_u64 *v = parse(&names, &nconds, co, lines, nlines);
+
+  //  print_dict(&names);
+
+  sd accepted_sd, rejected_sd, in_sd;
+  sd_init_str(&accepted_sd, "A");
+  sd_init_str(&rejected_sd, "R");
+  sd_init_str(&in_sd, "in");
+  size_t accepted = *(size_t *)dict_lookup(&names, accepted_sd);
+  size_t rejected = *(size_t *)dict_lookup(&names, rejected_sd);
+  size_t in = *(size_t *)dict_lookup(&names, in_sd);
+
+  uint64_t add = 0;
+  for (i = 0; i < v[0].nmemb; i++) {
+    part_t tpart;
+    tpart.v[0] = v[0].data[i];
+    tpart.v[1] = v[1].data[i];
+    tpart.v[2] = v[2].data[i];
+    tpart.v[3] = v[3].data[i];
+    if (check_part(tpart, co, nconds, accepted, rejected, in)) {
+      add += tpart.v[0] + tpart.v[1] + tpart.v[2] + tpart.v[3];
+    }
+  }
+
+  for (i = 0; i < nlines; i++)
+    free(co[i]);
+
+  printf("%llu\n", add);
+}
diff --git a/day19/uppgb.c b/day19/uppgb.c
@@ -0,0 +1,389 @@
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/queue.h>
+
+#include <dict.h>
+#include <reading.h>
+#include <stack_u64.h>
+
+dict_t *names;
+
+#define MAX_CONDITIONS 32
+#define MAX_NBRS 2048
+
+typedef struct {
+  uint64_t bounds[4][2];
+} cond_t;
+
+typedef struct {
+  size_t n;
+  size_t entry[MAX_CONDITIONS];
+  size_t iftru[MAX_CONDITIONS];
+  cond_t condition[MAX_CONDITIONS];
+} cond_list_t;
+
+typedef struct {
+  size_t nnbrs;
+  size_t *nbrs;
+  cond_t *cond;
+} edge_list_t;
+
+static inline size_t add_name(char *name) {
+  sd sdname;
+  sd_init_str(&sdname, name);
+  void *p = dict_lookup(names, sdname);
+
+  if (p != NULL) {
+    return *(size_t *)p;
+  } else {
+    size_t *x = malloc(sizeof(*x));
+    *x = names->nelts;
+    dict_insert(names, sdname, x);
+
+    return *x;
+  }
+}
+
+static inline void parse_end_condition(cond_list_t *res, char *s) {
+  assert(res->n < MAX_CONDITIONS);
+  cond_t v = {
+      .bounds = {
+          {0, UINT64_MAX}, {0, UINT64_MAX}, {0, UINT64_MAX}, {0, UINT64_MAX}}};
+  res->condition[res->n] = v;
+  res->entry[res->n] = SIZE_MAX;
+  res->iftru[res->n] = add_name(s);
+  res->n++;
+}
+
+static inline void parse_mid_condition(cond_list_t *res, char *s) {
+  assert(res->n < MAX_CONDITIONS);
+
+  size_t entry = SIZE_MAX;
+  switch (s[0]) {
+  case 'x':
+    entry = 0;
+    break;
+  case 'm':
+    entry = 1;
+    break;
+  case 'a':
+    entry = 2;
+    break;
+  case 's':
+    entry = 3;
+    break;
+  }
+
+  assert(entry != SIZE_MAX);
+  assert(entry < 5);
+
+  cond_t v = {
+      .bounds = {
+          {0, UINT64_MAX}, {0, UINT64_MAX}, {0, UINT64_MAX}, {0, UINT64_MAX}}};
+  res->condition[res->n] = v;
+
+  uint64_t bound_value;
+  char *cp = sread_next_u64(&bound_value, s);
+  assert(cp[0] == ':');
+  cp++;
+  res->iftru[res->n] = add_name(cp);
+
+  switch (s[1]) {
+  case '>':
+    res->condition[res->n].bounds[entry][0] = bound_value;
+    break;
+  case '<':
+    res->condition[res->n].bounds[entry][1] = bound_value;
+    break;
+  case '=':
+    assert(bound_value > 0);
+    assert(bound_value < UINT64_MAX);
+    res->condition[res->n].bounds[entry][0] = bound_value - 1;
+    res->condition[res->n].bounds[entry][1] = bound_value + 1;
+    break;
+  default:
+    assert(1 == 2);
+  }
+
+  res->entry[res->n] = entry;
+  res->n++;
+}
+
+static inline cond_list_t parse_conds(char *s) {
+  cond_list_t res;
+  res.n = 0;
+
+  char *sa = strtok(s, ",");
+  while (sa != NULL) {
+    if (!strstr(sa, ":")) {
+      parse_end_condition(&res, sa);
+    } else {
+      parse_mid_condition(&res, sa);
+    }
+    sa = strtok(NULL, ",");
+  }
+
+  return res;
+}
+
+static inline cond_list_t parse_line(stack_u64 *linerow, char *line) {
+  cond_list_t r;
+
+  if (strlen(line) < 2) {
+    r.n = SIZE_MAX;
+    return r;
+  }
+
+  char *sa = strtok(line, "{}");
+  size_t row = add_name(sa);
+  sa = strtok(NULL, "{}");
+  while (sa != NULL) {
+    r = parse_conds(sa);
+    sa = strtok(NULL, "{}");
+  }
+
+  stack_u64_push(linerow, row);
+
+  return r;
+}
+
+static inline cond_list_t tail_cond_list(cond_list_t clist) {
+  cond_list_t r;
+  r.n = clist.n - 1;
+
+  size_t i;
+  for (i = 0; i < r.n; i++) {
+    r.entry[i] = clist.entry[i + 1];
+    r.iftru[i] = clist.iftru[i + 1];
+    r.condition[i] = clist.condition[i + 1];
+  }
+
+  return r;
+}
+
+static inline uint64_t mmax(const uint64_t x, const uint64_t y) {
+  return x < y ? y : x;
+}
+
+static inline uint64_t mmin(const uint64_t x, const uint64_t y) {
+  return x < y ? x : y;
+}
+
+static inline void append_list(cond_list_t *r, cond_list_t *a) {
+  assert(r->n + a->n <= MAX_CONDITIONS);
+
+  size_t i;
+  for (i = 0; i < a->n; i++) {
+    r->entry[r->n] = a->entry[i];
+    r->condition[r->n] = a->condition[i];
+    r->iftru[r->n] = a->iftru[i];
+    r->n++;
+  }
+}
+
+static cond_list_t exclusive_conditions(cond_list_t clist, cond_t base) {
+  if (clist.n == 1) {
+    assert(clist.entry[0] == SIZE_MAX); // end condition
+    cond_list_t ret;
+    ret.n = 1;
+    ret.condition[0] = base;
+    return ret;
+  }
+
+  size_t entry = clist.entry[0];
+  cond_list_t tail = tail_cond_list(clist);
+  cond_t head = clist.condition[0];
+
+  cond_t andro = base;
+  int halist = 0;
+  cond_list_t alist;
+  int hblist = 0;
+  cond_list_t blist;
+  andro.bounds[entry][0] = mmax(base.bounds[entry][0], head.bounds[entry][0]);
+  andro.bounds[entry][1] = mmin(base.bounds[entry][1], head.bounds[entry][1]);
+
+  if (head.bounds[entry][0] != 0) {
+    // recurse a
+    halist = 1;
+    cond_t nbase = base;
+    nbase.bounds[entry][0] = base.bounds[entry][0];
+    nbase.bounds[entry][1] =
+        mmin(base.bounds[entry][1], head.bounds[entry][0] + 1);
+    alist = exclusive_conditions(tail, nbase);
+  }
+
+  if (head.bounds[entry][1] != UINT64_MAX) {
+    // recurse b
+    hblist = 1;
+    cond_t nbase = base;
+    nbase.bounds[entry][1] = base.bounds[entry][1];
+    nbase.bounds[entry][0] =
+        mmax(base.bounds[entry][0], head.bounds[entry][1] - 1);
+    blist = exclusive_conditions(tail, nbase);
+  }
+
+  cond_list_t ret;
+  ret.n = 1;
+  ret.condition[0] = andro;
+
+  if (halist) {
+    // append alist to ret
+    append_list(&ret, &alist);
+  }
+
+  if (hblist) {
+    // append blist to ret
+    append_list(&ret, &blist);
+  }
+
+  return ret;
+}
+
+static inline void add_edge(edge_list_t *rgraph, size_t from, size_t to,
+                            cond_t cond) {
+  size_t nn = rgraph[from].nnbrs;
+  assert(nn < MAX_NBRS);
+  rgraph[from].nbrs[nn] = to;
+  rgraph[from].cond[nn] = cond;
+  rgraph[from].nnbrs++;
+}
+
+static inline void reverse_graph(edge_list_t *rgraph, size_t n,
+                                 cond_list_t *clists, size_t nclists,
+                                 stack_u64 *froms) {
+  size_t i, j;
+  for (i = 0; i < nclists; i++) {
+    for (j = 0; j < clists[i].n; j++) {
+      add_edge(rgraph, clists[i].iftru[j], froms->data[i],
+               clists[i].condition[j]);
+    }
+  }
+}
+
+static inline cond_t intersect_condition(cond_t ca, cond_t cb) {
+  return (cond_t){.bounds = {{mmax(ca.bounds[0][0], cb.bounds[0][0]),
+                              mmin(ca.bounds[0][1], cb.bounds[0][1])},
+                             {mmax(ca.bounds[1][0], cb.bounds[1][0]),
+                              mmin(ca.bounds[1][1], cb.bounds[1][1])},
+                             {mmax(ca.bounds[2][0], cb.bounds[2][0]),
+                              mmin(ca.bounds[2][1], cb.bounds[2][1])},
+                             {mmax(ca.bounds[3][0], cb.bounds[3][0]),
+                              mmin(ca.bounds[3][1], cb.bounds[3][1])}}};
+}
+
+static inline int sensible_condition(cond_t c) {
+  if (c.bounds[0][0] + 2 > c.bounds[0][1])
+    return 0;
+  if (c.bounds[1][0] + 2 > c.bounds[1][1])
+    return 0;
+  if (c.bounds[2][0] + 2 > c.bounds[2][1])
+    return 0;
+  if (c.bounds[3][0] + 2 > c.bounds[3][1])
+    return 0;
+  return 1;
+}
+
+static inline uint64_t count_cond(cond_t c) {
+  uint64_t p = 1;
+  p *= (c.bounds[0][1] - 1 - c.bounds[0][0]);
+  p *= (c.bounds[1][1] - 1 - c.bounds[1][0]);
+  p *= (c.bounds[2][1] - 1 - c.bounds[2][0]);
+  p *= (c.bounds[3][1] - 1 - c.bounds[3][0]);
+  return p;
+}
+
+typedef struct entry {
+  size_t vx;
+  cond_t cond;
+
+  SIMPLEQ_ENTRY(entry) entries;
+} entry_t;
+
+static inline uint64_t allpath_cond(edge_list_t *rgraph, size_t start,
+                                    size_t end, cond_t scond) {
+  uint64_t sumsi = 0;
+
+  SIMPLEQ_HEAD(listhead, entry) head = SIMPLEQ_HEAD_INITIALIZER(head);
+  entry_t *np = malloc(sizeof(*np));
+  np->vx = start;
+  np->cond = scond;
+  SIMPLEQ_INSERT_HEAD(&head, np, entries);
+
+  while (!SIMPLEQ_EMPTY(&head)) {
+    np = SIMPLEQ_FIRST(&head);
+    SIMPLEQ_REMOVE_HEAD(&head, entries);
+
+    if (np->vx == end) {
+      sumsi += count_cond(np->cond);
+    } else {
+      size_t i;
+      for (i = 0; i < rgraph[np->vx].nnbrs; i++) {
+        cond_t ic = intersect_condition(rgraph[np->vx].cond[i], np->cond);
+        if (sensible_condition(ic)) {
+          entry_t *nnp = malloc(sizeof(*nnp));
+          nnp->vx = rgraph[np->vx].nbrs[i];
+          nnp->cond = ic;
+          SIMPLEQ_INSERT_TAIL(&head, nnp, entries);
+        }
+      }
+    }
+
+    free(np);
+  }
+
+  return sumsi;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  names = malloc(sizeof(*names));
+  dict_init(names);
+
+  size_t nclists = 0;
+  cond_list_t clists[nlines];
+  stack_u64 froms;
+  stack_u64_init(&froms);
+  clists[0] = parse_line(&froms, lines[0]);
+  nclists++;
+
+  while (clists[nclists - 1].n != SIZE_MAX) {
+    clists[nclists] = parse_line(&froms, lines[nclists]);
+    nclists++;
+  }
+  nclists--;
+
+  size_t i, j;
+  for (i = 0; i < nclists; i++) {
+    cond_t base = {.bounds = {{0, UINT64_MAX},
+                              {0, UINT64_MAX},
+                              {0, UINT64_MAX},
+                              {0, UINT64_MAX}}};
+    cond_list_t excl = exclusive_conditions(clists[i], base);
+    for (j = 0; j < excl.n; j++) {
+      clists[i].condition[j] = excl.condition[j];
+    }
+  }
+
+  size_t n = names->nelts;
+  edge_list_t rgraph[n];
+  for (i = 0; i < n; i++) {
+    rgraph[i].nnbrs = 0;
+    rgraph[i].nbrs = malloc(MAX_NBRS * sizeof(*(rgraph[i].nbrs)));
+    rgraph[i].cond = malloc(MAX_NBRS * sizeof(*(rgraph[i].cond)));
+  }
+  reverse_graph(rgraph, n, clists, nclists, &froms);
+
+  cond_t scond = {.bounds = {{0, 4001}, {0, 4001}, {0, 4001}, {0, 4001}}};
+  size_t start = add_name("A");
+  size_t end = add_name("in");
+  uint64_t sum = allpath_cond(rgraph, start, end, scond);
+
+  printf("%llu\n", sum);
+
+  stack_u64_clear(&froms);
+  free(names);
+}
diff --git a/day2/Makefile b/day2/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day2/common.c b/day2/common.c
@@ -0,0 +1,3 @@
+#include "common.h"
+
+size_t fn(char **lines, size_t nlines) { return 0; }
diff --git a/day2/common.h b/day2/common.h
@@ -0,0 +1,13 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <limits.h>
+#include <reading.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+size_t fn(char **lines, size_t nlines);
+
+#endif
diff --git a/day2/input b/day2/input
@@ -0,0 +1,100 @@
+Game 1: 4 blue, 16 green, 2 red; 5 red, 11 blue, 16 green; 9 green, 11 blue; 10 blue, 6 green, 4 red
+Game 2: 15 green, 20 red, 8 blue; 12 green, 7 red; 10 green, 2 blue, 15 red; 13 blue, 15 red
+Game 3: 8 red, 2 blue; 3 green, 10 blue, 10 red; 7 green, 4 blue, 7 red; 8 red, 6 green, 13 blue; 4 green, 3 blue, 10 red; 7 blue, 7 green, 5 red
+Game 4: 13 green, 14 blue, 9 red; 6 green, 14 red, 18 blue; 9 red, 11 green, 3 blue; 11 green, 10 red, 14 blue; 17 blue, 3 red, 4 green; 17 blue, 1 red, 9 green
+Game 5: 2 green, 1 red; 8 blue, 2 green, 6 red; 5 blue, 9 red, 2 green; 3 green, 8 red, 6 blue; 6 blue, 5 red
+Game 6: 3 green, 7 blue, 5 red; 3 green, 6 red; 11 blue, 6 red, 1 green
+Game 7: 8 red, 4 green, 11 blue; 12 blue, 1 green, 5 red; 6 red, 1 green, 5 blue; 12 blue, 2 green, 2 red; 4 blue, 4 green, 3 red; 9 blue, 4 green, 8 red
+Game 8: 1 red, 4 green; 6 red, 1 green; 10 red; 1 blue, 2 green; 4 green, 3 red; 1 blue, 8 red
+Game 9: 9 blue, 13 green, 1 red; 10 green, 4 blue, 4 red; 3 red, 4 blue, 14 green; 13 blue, 1 red, 12 green
+Game 10: 2 blue, 16 red, 2 green; 1 green, 16 red, 6 blue; 9 red, 3 green; 1 green, 2 blue, 8 red; 8 red, 6 blue, 3 green
+Game 11: 7 green, 11 red, 12 blue; 3 blue, 6 green, 6 red; 10 blue, 13 green; 1 red, 13 green, 9 blue; 2 blue, 2 red, 13 green; 2 red, 3 blue, 15 green
+Game 12: 3 green, 2 red, 2 blue; 7 green, 5 blue; 1 blue, 1 red, 3 green
+Game 13: 2 green, 2 red, 3 blue; 3 blue, 3 red, 3 green; 3 green, 2 red; 2 blue, 3 red, 3 green; 2 green, 3 red, 1 blue
+Game 14: 4 green, 9 red; 11 green, 10 red, 12 blue; 6 red, 3 green, 12 blue; 5 green, 4 red, 4 blue; 18 blue, 7 red, 11 green; 16 blue, 4 red, 10 green
+Game 15: 5 green, 2 red, 9 blue; 18 green, 6 red, 20 blue; 11 blue, 12 green, 11 red; 9 red, 17 blue, 16 green; 7 green, 1 red, 9 blue
+Game 16: 9 blue, 11 green; 8 green, 2 blue; 1 red, 6 green, 4 blue
+Game 17: 2 red, 2 green, 2 blue; 7 blue, 4 green, 3 red; 2 red, 8 blue, 1 green; 2 red, 6 blue, 2 green; 4 blue, 3 red; 4 green, 5 red, 6 blue
+Game 18: 6 green, 7 red; 3 blue, 6 green, 1 red; 6 red, 3 blue, 5 green
+Game 19: 6 red, 4 green, 5 blue; 2 red, 4 blue, 13 green; 1 green, 1 blue, 2 red; 4 green
+Game 20: 7 red, 17 blue, 6 green; 3 blue, 6 green, 8 red; 7 blue, 6 red, 1 green; 3 green; 8 red, 7 green, 14 blue
+Game 21: 5 red, 3 blue, 7 green; 1 blue, 2 red, 5 green; 2 blue, 8 green, 3 red; 3 blue, 8 red, 4 green; 5 red, 1 blue, 3 green
+Game 22: 2 red, 6 green, 1 blue; 3 red, 3 green, 1 blue; 2 green, 7 red, 2 blue; 5 green, 1 red
+Game 23: 2 red, 16 green, 1 blue; 1 red, 12 green, 3 blue; 12 green, 1 blue, 3 red
+Game 24: 7 red, 1 blue, 12 green; 2 red, 19 green, 3 blue; 19 green, 1 blue, 12 red; 6 green, 16 red, 5 blue; 11 red, 4 blue, 12 green
+Game 25: 2 blue, 3 red, 8 green; 4 blue, 2 red, 9 green; 2 red, 7 blue
+Game 26: 17 red, 8 blue, 3 green; 3 green, 13 red, 4 blue; 20 red, 1 green, 6 blue; 7 blue, 2 red, 2 green; 20 red, 8 blue; 2 green, 16 red, 8 blue
+Game 27: 3 blue, 17 green, 19 red; 16 green, 5 red, 6 blue; 17 green, 16 red, 4 blue
+Game 28: 1 green, 7 red, 1 blue; 8 green, 12 red, 1 blue; 1 blue, 9 red, 1 green
+Game 29: 3 green, 3 blue, 2 red; 3 green, 2 red, 1 blue; 3 green, 2 red, 3 blue; 3 blue, 3 red, 4 green
+Game 30: 3 red, 8 blue, 3 green; 1 green, 1 red; 17 green, 17 blue; 19 green, 15 blue, 1 red; 1 green, 2 red, 16 blue
+Game 31: 11 green, 11 blue, 14 red; 6 blue, 15 green, 2 red; 11 blue, 19 green, 2 red
+Game 32: 9 red, 2 green; 7 green, 4 blue, 2 red; 6 red, 5 green, 1 blue; 4 red, 4 blue, 1 green; 8 red, 6 green
+Game 33: 6 blue, 16 red, 9 green; 5 red, 7 blue, 13 green; 1 green, 9 blue, 1 red; 4 green, 9 blue, 17 red; 2 green, 10 red, 13 blue; 9 red, 1 blue, 14 green
+Game 34: 2 red, 2 green, 4 blue; 3 blue, 2 green; 1 green, 1 red, 2 blue; 1 red, 3 blue, 3 green; 2 green, 8 blue, 2 red; 3 blue, 1 red
+Game 35: 4 red, 14 blue, 2 green; 1 green, 15 blue, 1 red; 1 blue, 2 red, 1 green
+Game 36: 4 blue, 1 red, 2 green; 2 green, 15 blue, 8 red; 7 blue, 1 red; 7 red, 1 green, 1 blue
+Game 37: 2 blue, 1 green, 5 red; 2 blue, 2 green, 4 red; 2 blue, 5 red, 8 green; 3 green, 2 blue, 1 red; 1 red, 1 blue, 5 green; 2 blue, 1 red, 8 green
+Game 38: 2 blue, 4 green, 11 red; 7 green, 6 red, 2 blue; 1 green, 3 red, 1 blue; 4 blue, 4 green, 4 red; 2 red, 5 blue, 2 green
+Game 39: 7 green, 7 blue, 2 red; 11 blue, 4 green, 8 red; 10 red, 4 green, 1 blue; 8 green, 9 blue; 9 green, 4 red; 1 green, 8 blue
+Game 40: 1 green, 13 blue; 6 blue, 7 red; 8 red; 1 green, 13 blue, 3 red; 1 green, 16 red, 13 blue; 14 blue, 14 red, 1 green
+Game 41: 5 green, 2 blue, 10 red; 4 green, 2 blue, 5 red; 6 green, 9 red, 1 blue; 4 red, 1 blue; 1 red, 3 green, 2 blue; 3 red
+Game 42: 17 green, 11 blue, 11 red; 5 blue, 11 green, 9 red; 10 blue, 13 red, 4 green; 8 green, 4 blue, 15 red
+Game 43: 1 red, 3 blue; 1 green, 3 blue, 1 red; 2 blue, 1 green; 2 green, 1 blue; 1 red, 3 blue
+Game 44: 7 green, 5 red, 1 blue; 6 green, 1 blue, 5 red; 2 blue, 6 green; 3 green, 2 red; 4 green; 6 red
+Game 45: 16 red, 14 blue, 19 green; 1 red, 5 green, 6 blue; 16 blue, 2 green, 1 red; 15 green, 6 red, 16 blue
+Game 46: 8 blue, 2 green; 4 red, 3 green, 6 blue; 1 green, 8 blue, 3 red; 3 green, 12 blue, 1 red
+Game 47: 9 green, 3 blue; 1 green, 1 blue; 4 blue, 9 green, 6 red; 8 green, 4 blue, 6 red; 6 red, 12 green, 1 blue; 4 blue, 7 green
+Game 48: 11 green, 4 blue, 1 red; 11 blue, 8 red, 9 green; 4 blue, 3 red, 7 green; 10 blue, 2 green, 9 red; 8 green, 2 blue, 2 red
+Game 49: 8 green, 1 blue, 5 red; 1 green, 1 blue; 3 green, 4 red, 2 blue; 1 blue, 7 green, 1 red; 1 blue, 7 green, 3 red; 5 red, 5 green
+Game 50: 2 green, 2 red, 4 blue; 8 blue, 2 green, 7 red; 4 blue, 5 red; 9 red, 4 blue; 5 blue, 9 red; 2 green, 8 red, 6 blue
+Game 51: 6 green, 1 red, 2 blue; 2 red, 4 blue, 6 green; 9 blue, 4 green
+Game 52: 7 green, 3 red, 12 blue; 8 blue, 9 red, 5 green; 2 blue, 10 green, 8 red; 12 red, 5 green, 3 blue; 8 red, 8 green, 12 blue; 2 green
+Game 53: 2 green, 9 blue, 5 red; 6 red, 3 green; 5 red, 2 green
+Game 54: 9 red, 13 blue; 1 green, 9 red, 16 blue; 12 red, 1 blue, 4 green
+Game 55: 1 red, 2 blue, 3 green; 1 blue; 1 red, 5 blue, 3 green; 1 blue, 3 green; 5 blue
+Game 56: 1 green, 4 red, 1 blue; 1 blue, 2 red, 13 green; 5 blue, 4 red; 13 green, 3 red, 3 blue
+Game 57: 13 blue, 2 red, 7 green; 3 green, 4 red, 14 blue; 3 red, 3 green, 3 blue; 7 blue, 5 green, 1 red
+Game 58: 6 red; 1 blue, 4 red, 2 green; 3 green, 1 blue; 7 green, 1 red; 6 red, 13 green, 1 blue; 3 red, 13 green, 1 blue
+Game 59: 5 green, 10 red, 8 blue; 7 red, 3 green, 2 blue; 6 green, 3 red, 6 blue
+Game 60: 2 green, 5 red, 15 blue; 2 green, 9 blue; 9 blue, 8 green, 3 red; 2 green, 6 red, 2 blue
+Game 61: 8 blue, 3 green, 4 red; 1 red, 10 blue, 1 green; 4 red, 5 green, 3 blue; 3 red, 8 blue, 5 green
+Game 62: 19 blue, 3 red, 14 green; 1 green, 7 blue, 1 red; 15 red, 20 blue, 6 green; 8 red, 4 green, 14 blue
+Game 63: 13 red, 1 blue; 18 red, 4 green; 6 green, 9 red, 1 blue; 7 green, 1 blue, 9 red; 5 red, 1 blue, 4 green; 5 green, 1 blue, 17 red
+Game 64: 2 green, 1 blue, 5 red; 2 red, 5 green; 6 red, 4 green
+Game 65: 1 blue, 7 green, 1 red; 7 red, 1 green; 1 blue, 3 green, 3 red; 7 red, 3 green; 3 green, 7 red; 1 blue, 4 green
+Game 66: 7 green, 6 blue, 8 red; 4 green, 9 red, 3 blue; 6 green, 4 blue; 5 blue, 2 green; 6 red, 4 green, 2 blue
+Game 67: 10 blue, 17 green, 17 red; 11 red, 9 blue, 9 green; 9 blue, 19 red, 5 green; 5 red, 3 blue, 20 green; 11 red, 1 blue, 7 green
+Game 68: 9 green, 4 red, 5 blue; 11 blue, 9 green, 2 red; 11 blue, 2 red, 6 green; 2 green, 6 red, 3 blue; 1 blue, 6 green, 4 red
+Game 69: 3 red, 15 blue, 1 green; 4 red, 14 blue, 2 green; 4 red, 18 blue, 4 green
+Game 70: 3 red, 8 green; 2 red, 6 green; 4 red, 2 blue, 2 green; 8 red, 1 green, 2 blue; 6 red, 3 blue, 4 green; 13 green, 8 red
+Game 71: 3 green, 17 red; 2 red, 3 green; 2 green, 8 red, 1 blue; 11 red, 4 blue; 3 green, 11 red, 3 blue
+Game 72: 1 red, 17 blue, 8 green; 2 red, 11 blue, 16 green; 3 red, 16 blue, 1 green; 2 red, 3 green, 10 blue
+Game 73: 1 blue, 10 green, 8 red; 19 green, 10 red, 5 blue; 3 green, 13 red, 8 blue; 12 green, 4 blue; 2 green, 10 blue, 12 red
+Game 74: 17 blue, 7 red, 10 green; 16 blue, 5 red; 9 blue, 7 green, 2 red; 10 red, 4 green, 14 blue
+Game 75: 10 green, 5 blue, 4 red; 7 red, 10 blue, 7 green; 7 blue, 9 green, 2 red
+Game 76: 13 green, 16 red, 20 blue; 4 red, 14 blue, 5 green; 12 red, 1 blue, 8 green
+Game 77: 4 red, 2 green; 8 blue, 3 green, 2 red; 5 blue, 7 green, 3 red
+Game 78: 12 green, 8 red, 8 blue; 10 green, 9 red, 10 blue; 16 blue, 1 red, 17 green; 4 red, 15 green, 13 blue
+Game 79: 4 green, 2 red; 15 red, 3 blue; 15 red, 5 green
+Game 80: 4 blue, 1 green, 13 red; 13 red, 1 blue, 5 green; 5 blue, 9 red; 3 blue, 3 green; 1 red; 3 red, 7 green, 6 blue
+Game 81: 10 red, 3 green, 4 blue; 2 red, 5 green, 16 blue; 3 green, 1 blue; 9 blue, 2 green, 12 red
+Game 82: 1 green, 9 blue, 1 red; 10 blue, 1 red, 1 green; 1 green, 7 blue; 8 blue
+Game 83: 1 blue, 5 red; 2 blue, 3 red; 1 green, 2 blue, 1 red; 2 red, 1 blue, 1 green; 1 green, 1 blue; 2 red, 1 green
+Game 84: 5 red, 14 blue, 2 green; 6 blue, 5 red, 8 green; 12 green, 3 blue, 5 red; 2 red, 10 green; 9 green, 14 blue
+Game 85: 2 blue, 2 red; 14 red, 6 green, 5 blue; 5 green, 4 blue, 6 red; 8 red, 5 blue, 6 green
+Game 86: 1 blue, 10 red; 4 red; 9 blue, 18 red, 3 green; 1 green, 1 blue, 7 red; 3 green, 8 red, 9 blue; 14 red, 2 green, 4 blue
+Game 87: 1 green, 11 red, 8 blue; 1 green, 11 red, 2 blue; 7 red, 4 blue; 6 blue, 1 red, 2 green; 13 blue, 2 green; 6 blue, 12 red, 3 green
+Game 88: 2 blue, 4 red, 8 green; 4 blue, 7 red; 3 red, 10 green, 4 blue; 9 green, 3 blue, 5 red; 4 red, 6 blue, 3 green
+Game 89: 6 red, 10 green; 15 green, 15 red, 10 blue; 15 red, 1 green, 4 blue; 13 red, 6 blue, 4 green
+Game 90: 17 green, 2 red, 1 blue; 6 green; 1 blue, 1 green; 1 blue, 16 green, 3 red; 14 green, 1 red
+Game 91: 3 blue, 8 green; 3 green, 7 red, 9 blue; 12 blue; 9 red, 7 blue, 4 green; 1 green, 7 red, 1 blue
+Game 92: 11 blue, 9 red, 12 green; 1 blue, 14 red, 6 green; 9 green, 6 red, 6 blue
+Game 93: 1 red, 2 blue; 3 blue, 6 green; 1 red, 4 green, 3 blue
+Game 94: 3 green, 3 blue; 1 red, 3 blue, 9 green; 3 blue, 10 green, 3 red; 10 green, 6 blue, 2 red; 9 blue, 14 green, 2 red; 1 red, 4 blue, 1 green
+Game 95: 7 blue, 10 green; 3 blue, 5 green, 2 red; 4 blue, 10 green, 12 red; 6 green, 2 red, 6 blue
+Game 96: 2 blue, 18 green, 8 red; 13 green, 3 blue, 3 red; 3 blue, 15 red, 8 green; 13 green, 10 red, 2 blue
+Game 97: 14 blue, 2 red; 15 blue, 1 green, 2 red; 3 red, 6 blue, 1 green; 1 green, 14 blue, 4 red
+Game 98: 4 blue, 9 red; 10 red, 1 green, 11 blue; 7 blue, 1 red; 1 red, 6 blue, 1 green
+Game 99: 7 red, 6 green, 2 blue; 8 red; 16 green, 7 red, 4 blue
+Game 100: 1 red, 1 green, 9 blue; 6 blue, 4 green, 3 red; 4 red, 2 green; 3 green, 2 red, 11 blue; 6 green, 5 blue, 1 red
diff --git a/day2/uppga.c b/day2/uppga.c
@@ -0,0 +1,54 @@
+#include "common.h"
+
+#define RED 0
+#define GREEN 1
+#define BLUE 2
+
+static int test_line(char *line) {
+  char *cp = line;
+  long bag[3] = {12, 13, 14};
+
+  while (*cp != '\0') {
+    if (cp[1] == ' ' && '0' <= cp[0] && cp[0] <= '9') {
+      char *pp = cp;
+      while (*pp != ' ')
+        pp--;
+      pp++;
+
+      long v = strtol(pp, NULL, 10);
+
+      if (cp[2] == 'r') {
+        if (bag[RED] < v)
+          return -1;
+      } else if (cp[2] == 'g') {
+        if (bag[GREEN] < v)
+          return -1;
+      } else if (cp[2] == 'b') {
+        if (bag[BLUE] < v)
+          return -1;
+      } else {
+        printf("ERROR\n");
+        exit(1);
+      }
+    }
+
+    cp++;
+  }
+
+  return 0;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  size_t i;
+  size_t sum = 0;
+  for (i = 0; i < nlines; i++) {
+    if (!test_line(lines[i])) {
+      sum += (i + 1);
+    }
+  }
+
+  printf("%zu\n", sum);
+}
diff --git a/day2/uppgb.c b/day2/uppgb.c
@@ -0,0 +1,55 @@
+#include "common.h"
+
+#define RED 0
+#define GREEN 1
+#define BLUE 2
+
+static long line_min_power(char *line) {
+  char *cp = line;
+  long min[3] = {0, 0, 0};
+
+  while (*cp != '\0') {
+    if (cp[1] == ' ' && '0' <= cp[0] && cp[0] <= '9') {
+      char *pp = cp;
+      while (*pp != ' ')
+        pp--;
+      pp++;
+
+      long v = strtol(pp, NULL, 10);
+
+      if (cp[2] == 'r') {
+        if (min[RED] < v) {
+          min[RED] = v;
+        }
+      } else if (cp[2] == 'g') {
+        if (min[GREEN] < v) {
+          min[GREEN] = v;
+        }
+      } else if (cp[2] == 'b') {
+        if (min[BLUE] < v) {
+          min[BLUE] = v;
+        }
+      } else {
+        printf("ERROR\n");
+        exit(1);
+      }
+    }
+
+    cp++;
+  }
+
+  return min[RED] * min[GREEN] * min[BLUE];
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  size_t i;
+  long sum = 0;
+  for (i = 0; i < nlines; i++) {
+    sum += line_min_power(lines[i]);
+  }
+
+  printf("%ld\n", sum);
+}
diff --git a/day20/Makefile b/day20/Makefile
@@ -0,0 +1,31 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+GCFLAGS+=-L/usr/local/lib
+LDFLAGS=-lgmp
+
+UTILS=../utils/reading.o ../utils/stack_u64.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(GCFLAGS) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES) $(LDFLAGS)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day20/common.c b/day20/common.c
@@ -0,0 +1,3 @@
+#include "common.h"
+
+size_t fn(char **lines, size_t nlines) { return 0; }
diff --git a/day20/common.h b/day20/common.h
@@ -0,0 +1,16 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <gmp.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/queue.h>
+
+#include <reading.h>
+#include <stack_u64.h>
+
+size_t fn(char **lines, size_t nlines);
+
+#endif
diff --git a/day20/exinput b/day20/exinput
@@ -0,0 +1,5 @@
+broadcaster -> a, b, c
+%a -> b
+%b -> c
+%c -> inv
+&inv -> a
diff --git a/day20/exinput2 b/day20/exinput2
@@ -0,0 +1,5 @@
+broadcaster -> a
+%a -> inv, con
+&inv -> b
+%b -> con
+&con -> output
diff --git a/day20/input b/day20/input
@@ -0,0 +1,58 @@
+%cg -> mt, hb
+%sp -> xm
+%nr -> hf, mt
+broadcaster -> tl, gd, zb, gc
+&qz -> qn
+%df -> hd
+%vg -> rm, kx
+%gm -> mt, md
+%ls -> hc
+%lq -> zq, fx
+&zd -> bz, kg, zb, lf, sq, zk, jx
+%lz -> mt
+%sq -> zk
+%zn -> kx, tc
+&zq -> mb, hc, qz, ql, tl, ls
+&mt -> zm, tt, mh, gd, md
+%lm -> mb, zq
+%hf -> mt, sm
+%hb -> mh, mt
+%rm -> kx
+%gc -> kx, sp
+&cq -> qn
+%mh -> jt
+%zm -> nr
+%xm -> kx, ld
+&jx -> qn
+&qn -> rx
+%mp -> qt, kx
+%zk -> vj
+%hd -> mp, kx
+%tl -> zq, hl
+%zb -> zd, ph
+%cl -> zd
+&tt -> qn
+%ld -> zn
+%js -> lq, zq
+%sm -> mt, lz
+%qt -> vg, kx
+%md -> cg
+%vj -> bz, zd
+%qs -> zd, fs
+%mb -> ps
+&kx -> cq, gc, sp, df, ld
+%hc -> lm
+%tc -> df, kx
+%ps -> js, zq
+%fs -> qc, zd
+%hl -> jj, zq
+%bz -> qs
+%jj -> zq, ql
+%ql -> ls
+%ph -> kg, zd
+%qc -> cl, zd
+%lf -> sq
+%kg -> lf
+%fx -> zq
+%jt -> zm, mt
+%gd -> gm, mt
diff --git a/day20/uppga.c b/day20/uppga.c
@@ -0,0 +1,230 @@
+#include "common.h"
+
+#define ALPHSIZE 26
+#define BUTT 676
+#define BRDC 677
+
+typedef SIMPLEQ_HEAD(listhead, entry) head_t;
+
+typedef struct entry {
+  size_t from;
+  size_t to;
+  uint8_t val;
+
+  SIMPLEQ_ENTRY(entry) entries;
+} sig_t;
+
+typedef struct {
+  char *name;
+  uint8_t type;
+
+  uint64_t state;
+  size_t *inshift;
+  size_t nstate;
+
+  stack_u64 nbrs;
+} gate_t;
+
+static inline size_t pure_name_idx(char *s) {
+  return ((s[0] - 'a') * ALPHSIZE + (s[1] - 'a'));
+}
+
+static inline size_t name_idx(char *s) {
+  if (s[0] == 'b') {
+    if (s[1] == 'r') {
+      return BRDC;
+    } else {
+      return BUTT;
+    }
+  }
+
+  return pure_name_idx(&s[1]);
+}
+
+static inline void init_gate(gate_t *gt, char *line) {
+  gt->state = 0;
+  gt->name = line;
+
+  switch (line[0]) {
+  case '&':
+    gt->type = '&';
+    break;
+  case '%':
+    gt->type = '%';
+    break;
+  default:
+    gt->type = 'x';
+  }
+
+  stack_u64_init(&gt->nbrs);
+
+  char *cp = line;
+  while (*cp != ' ')
+    cp++;
+  cp++;
+
+  while (*cp != '\n' && *cp != EOF) {
+    while (*cp != ' ' && *cp != '\n' && *cp != EOF)
+      cp++;
+    if (*cp != ' ')
+      break;
+    cp++;
+
+    stack_u64_push(&gt->nbrs, pure_name_idx(cp));
+
+    cp++;
+  }
+}
+
+static inline void init_states(gate_t *gates) {
+  size_t i, j, to;
+  size_t countin[BRDC + 1] = {0};
+
+  for (i = 0; i < BRDC + 1; i++) {
+    if (gates[i].name != NULL) {
+      if (gates[i].type == '&') {
+        gates[i].inshift = malloc((BRDC + 1) * sizeof(*(gates[i].inshift)));
+      } else {
+        gates[i].inshift = NULL;
+      }
+    }
+  }
+
+  for (i = 0; i < BRDC + 1; i++) {
+    if (gates[i].name != NULL) {
+      for (j = 0; j < gates[i].nbrs.nmemb; j++) {
+        to = gates[i].nbrs.data[j];
+        if (gates[to].type == '&')
+          gates[to].inshift[i] = countin[to];
+        countin[to]++;
+      }
+    }
+  }
+
+  for (i = 0; i < BRDC + 1; i++) {
+    if (gates[i].name != NULL) {
+      switch (gates[i].type) {
+      case '%':
+        gates[i].nstate = 1;
+        break;
+      case '&':
+        gates[i].nstate = countin[i];
+        break;
+      default:
+        gates[i].nstate = SIZE_MAX;
+      }
+    }
+  }
+}
+
+static inline void send_pulses(gate_t *gate, size_t from, head_t *head,
+                               uint8_t pulse) {
+  size_t i;
+  for (i = 0; i < gate->nbrs.nmemb; i++) {
+    sig_t *n = malloc(sizeof(*n));
+    n->from = from;
+    n->to = gate->nbrs.data[i];
+    n->val = pulse;
+    SIMPLEQ_INSERT_TAIL(head, n, entries);
+  }
+}
+
+static inline void set_bit(uint64_t *out, size_t i, uint8_t val) {
+  assert(i < 63);
+
+  if (val) {
+    *out |= (1ULL << i);
+  } else {
+    *out &= (0xffffffffffffffffULL ^ (1ULL << i));
+  }
+}
+
+static inline void push(uint64_t *ulow, uint64_t *uhig, gate_t *gates) {
+  size_t i;
+  head_t head = SIMPLEQ_HEAD_INITIALIZER(head);
+
+  sig_t *s = malloc(sizeof(*s));
+  s->from = BUTT;
+  s->to = BRDC;
+  s->val = 0;
+
+  SIMPLEQ_INSERT_HEAD(&head, s, entries);
+
+  uint64_t clow = 0;
+  uint64_t chig = 0;
+
+  while (!SIMPLEQ_EMPTY(&head)) {
+    s = SIMPLEQ_FIRST(&head);
+    SIMPLEQ_REMOVE_HEAD(&head, entries);
+
+    if (s->val == 0) {
+      clow++;
+    } else {
+      chig++;
+    }
+
+    switch (gates[s->to].type) {
+    case '%':
+      if (s->val == 0) {
+        gates[s->to].state ^= 1;
+        send_pulses(&gates[s->to], s->to, &head, (uint8_t)gates[s->to].state);
+      }
+      break;
+    case '&':
+      set_bit(&(gates[s->to].state), gates[s->to].inshift[s->from], s->val);
+
+      uint8_t spulse = 0;
+      for (i = 0; i < gates[s->to].nstate; i++) {
+        if ((gates[s->to].nstate & (1ULL << i)) == 0) {
+          spulse = 1;
+          break;
+        }
+      }
+
+      send_pulses(&gates[s->to], s->to, &head, spulse);
+      break;
+    case 'x':
+      assert(s->from == BUTT);
+      assert(s->to == BRDC);
+      send_pulses(&gates[s->to], s->to, &head, 0);
+      break;
+    default:
+      assert(s->to == 465); // rx the only one
+    }
+
+    free(s);
+  }
+
+  *ulow = clow;
+  *uhig = chig;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  gate_t gates[BRDC + 1];
+  size_t i;
+  for (i = 0; i < BRDC + 1; i++)
+    gates[i].name = NULL;
+
+  size_t g;
+  for (i = 0; i < nlines; i++) {
+    g = name_idx(lines[i]);
+    init_gate(&gates[g], lines[i]);
+  }
+
+  init_states(gates);
+
+  uint64_t slow = 0;
+  uint64_t shig = 0;
+  uint64_t clow, chig;
+
+  for (i = 0; i < 1000; i++) {
+    push(&clow, &chig, gates);
+    slow += clow;
+    shig += chig;
+  }
+
+  printf("%llu\n", slow * shig);
+}
diff --git a/day20/uppgb.c b/day20/uppgb.c
@@ -0,0 +1,254 @@
+#include "common.h"
+
+#define ALPHSIZE 26
+#define BUTT 676
+#define BRDC 677
+
+#define QZ 441
+#define CQ 68
+#define JX 257
+#define TT 513
+
+typedef SIMPLEQ_HEAD(listhead, entry) head_t;
+
+typedef struct entry {
+  size_t from;
+  size_t to;
+  uint8_t val;
+
+  SIMPLEQ_ENTRY(entry) entries;
+} sig_t;
+
+typedef struct {
+  char *name;
+  uint8_t type;
+
+  uint64_t state;
+  size_t *inshift;
+  size_t nstate;
+
+  stack_u64 nbrs;
+} gate_t;
+
+static inline size_t pure_name_idx(char *s) {
+  return ((s[0] - 'a') * ALPHSIZE + (s[1] - 'a'));
+}
+
+static inline size_t name_idx(char *s) {
+  if (s[0] == 'b') {
+    if (s[1] == 'r') {
+      return BRDC;
+    } else {
+      return BUTT;
+    }
+  }
+
+  return pure_name_idx(&s[1]);
+}
+
+static inline void init_gate(gate_t *gt, char *line) {
+  gt->state = 0;
+  gt->name = line;
+
+  switch (line[0]) {
+  case '&':
+    gt->type = '&';
+    break;
+  case '%':
+    gt->type = '%';
+    break;
+  default:
+    gt->type = 'x';
+  }
+
+  stack_u64_init(&gt->nbrs);
+
+  char *cp = line;
+  while (*cp != ' ')
+    cp++;
+  cp++;
+
+  while (*cp != '\n' && *cp != EOF) {
+    while (*cp != ' ' && *cp != '\n' && *cp != EOF)
+      cp++;
+    if (*cp != ' ')
+      break;
+    cp++;
+
+    stack_u64_push(&gt->nbrs, pure_name_idx(cp));
+
+    cp++;
+  }
+}
+
+static inline void init_states(gate_t *gates) {
+  size_t i, j, to;
+  size_t countin[BRDC + 1] = {0};
+
+  for (i = 0; i < BRDC + 1; i++) {
+    if (gates[i].name != NULL) {
+      if (gates[i].type == '&') {
+        gates[i].inshift = malloc((BRDC + 1) * sizeof(*(gates[i].inshift)));
+      } else {
+        gates[i].inshift = NULL;
+      }
+    }
+  }
+
+  for (i = 0; i < BRDC + 1; i++) {
+    if (gates[i].name != NULL) {
+      for (j = 0; j < gates[i].nbrs.nmemb; j++) {
+        to = gates[i].nbrs.data[j];
+        if (gates[to].type == '&')
+          gates[to].inshift[i] = countin[to];
+        countin[to]++;
+      }
+    }
+  }
+
+  for (i = 0; i < BRDC + 1; i++) {
+    if (gates[i].name != NULL) {
+      switch (gates[i].type) {
+      case '%':
+        gates[i].nstate = 1;
+        break;
+      case '&':
+        gates[i].nstate = countin[i];
+        break;
+      default:
+        gates[i].nstate = SIZE_MAX;
+      }
+    }
+  }
+}
+
+static inline void send_pulses(gate_t *gate, size_t from, head_t *head,
+                               uint8_t pulse) {
+  size_t i;
+  for (i = 0; i < gate->nbrs.nmemb; i++) {
+    sig_t *n = malloc(sizeof(*n));
+    n->from = from;
+    n->to = gate->nbrs.data[i];
+    n->val = pulse;
+    SIMPLEQ_INSERT_TAIL(head, n, entries);
+  }
+}
+
+static inline void set_bit(uint64_t *out, size_t i, uint8_t val) {
+  assert(i < 63);
+
+  if (val) {
+    *out |= (1ULL << i);
+  } else {
+    *out &= (0xffffffffffffffffULL ^ (1ULL << i));
+  }
+}
+
+static inline void push(gate_t *gates, size_t idx, size_t *cycla,
+                        size_t *cyclb) {
+  size_t i;
+  head_t head = SIMPLEQ_HEAD_INITIALIZER(head);
+
+  sig_t *s = malloc(sizeof(*s));
+  s->from = BUTT;
+  s->to = BRDC;
+  s->val = 0;
+
+  SIMPLEQ_INSERT_HEAD(&head, s, entries);
+
+  uint64_t clow = 0;
+  uint64_t chig = 0;
+
+  while (!SIMPLEQ_EMPTY(&head)) {
+    s = SIMPLEQ_FIRST(&head);
+    SIMPLEQ_REMOVE_HEAD(&head, entries);
+
+    if (s->val == 0) {
+      clow++;
+    } else {
+      chig++;
+    }
+
+    if (s->val == 1 && s->to == 429) {
+      if (cycla[s->from] == SIZE_MAX) {
+        cycla[s->from] = idx + 1;
+      } else if (cyclb[s->from] == SIZE_MAX && idx + 1 != cycla[s->from]) {
+        cyclb[s->from] = idx + 1;
+      }
+    }
+
+    switch (gates[s->to].type) {
+    case '%':
+      if (s->val == 0) {
+        gates[s->to].state ^= 1;
+        send_pulses(&gates[s->to], s->to, &head, (uint8_t)gates[s->to].state);
+      }
+      break;
+    case '&':
+      set_bit(&(gates[s->to].state), gates[s->to].inshift[s->from], s->val);
+
+      uint8_t spulse = 0;
+      for (i = 0; i < gates[s->to].nstate; i++) {
+        if ((gates[s->to].state & (1ULL << i)) == 0) {
+          spulse = 1;
+          break;
+        }
+      }
+
+      send_pulses(&gates[s->to], s->to, &head, spulse);
+      break;
+    case 'x':
+      assert(s->from == BUTT);
+      assert(s->to == BRDC);
+      send_pulses(&gates[s->to], s->to, &head, 0);
+      break;
+    default:
+      assert(s->to == 465); // rx the only one
+    }
+
+    free(s);
+  }
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  gate_t gates[BRDC + 1];
+  size_t i;
+  for (i = 0; i < BRDC + 1; i++)
+    gates[i].name = NULL;
+
+  size_t g;
+  for (i = 0; i < nlines; i++) {
+    g = name_idx(lines[i]);
+    init_gate(&gates[g], lines[i]);
+  }
+
+  init_states(gates);
+
+  size_t cycla[BRDC + 1];
+  size_t cyclb[BRDC + 1];
+  for (i = 0; i < BRDC + 1; i++) {
+    cycla[i] = SIZE_MAX;
+    cyclb[i] = SIZE_MAX;
+  }
+
+  for (i = 0; i < 10000; i++) {
+    push(gates, i, cycla, cyclb);
+  }
+
+  mpz_t p;
+  mpz_init_set_ui(p, 1);
+
+  for (i = 0; i < BRDC + 1; i++) {
+    if (cycla[i] != SIZE_MAX) {
+      assert(cyclb[i] == cycla[i] * 2); // this makes the cycle possible
+      mpz_lcm_ui(p, p, cycla[i]);
+    }
+  }
+
+  gmp_printf("%Zd\n", p);
+
+  mpz_clear(p);
+}
diff --git a/day21/Makefile b/day21/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o ../utils/graph.o ../utils/stack_u64.o ../utils/set_u64p.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day21/common.c b/day21/common.c
@@ -0,0 +1,47 @@
+#include "common.h"
+
+static inline size_t idx(size_t row, size_t col, size_t ncols) {
+  return row * ncols + col;
+}
+
+static inline int walkable(char **lines, size_t r, size_t c) {
+  return lines[r][c] == '.' || lines[r][c] == 'S';
+}
+
+static inline void edge_adder(graph_t *g, char **lines, size_t nlines,
+                              size_t ncols, size_t row, size_t col) {
+  // north
+  if (row > 0 && walkable(lines, row - 1, col)) {
+    graph_add_edge(g, idx(row, col, ncols), idx(row - 1, col, ncols));
+  }
+
+  // east
+  if (col < ncols - 1 && walkable(lines, row, col + 1)) {
+    graph_add_edge(g, idx(row, col, ncols), idx(row, col + 1, ncols));
+  }
+
+  // south
+  if (row < nlines - 1 && walkable(lines, row + 1, col)) {
+    graph_add_edge(g, idx(row, col, ncols), idx(row + 1, col, ncols));
+  }
+
+  // west
+  if (col > 0 && walkable(lines, row, col - 1)) {
+    graph_add_edge(g, idx(row, col, ncols), idx(row, col - 1, ncols));
+  }
+}
+
+void read_grid(graph_t *g, size_t *start, char **lines, size_t nlines) {
+  size_t i, j;
+  size_t ncols = strlen(lines[0]) - 1;
+
+  graph_init(g, nlines * ncols);
+  for (i = 0; i < nlines; i++) {
+    for (j = 0; j < ncols; j++) {
+      if (lines[i][j] == '.' || lines[i][j] == 'S')
+        edge_adder(g, lines, nlines, ncols, i, j);
+      if (lines[i][j] == 'S')
+        *start = idx(i, j, ncols);
+    }
+  }
+}
diff --git a/day21/common.h b/day21/common.h
@@ -0,0 +1,23 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/queue.h>
+
+#include <graph.h>
+#include <reading.h>
+#include <set_u64p.h>
+
+typedef struct entry {
+  size_t node;
+  size_t dist;
+
+  SIMPLEQ_ENTRY(entry) entries;
+} entry_t;
+
+void read_grid(graph_t *g, size_t *start, char **lines, size_t nlines);
+
+#endif
diff --git a/day21/exinput b/day21/exinput
@@ -0,0 +1,11 @@
+...........
+.....###.#.
+.###.##..#.
+..#.#...#..
+....#.#....
+.##..S####.
+.##..#...#.
+.......##..
+.##.#.####.
+.##..##.##.
+...........
diff --git a/day21/input b/day21/input
@@ -0,0 +1,131 @@
+...................................................................................................................................
+...............#.....#...#......#...............#.....#...#...........#..#....##.#..#.........#..............#...........#..#......
+........#.#..........#.##..#.......#.#.#.......#..#........................#............#...#....#.............#....#.........#....
+.....#......#...................#...#......#.............#..............#.#....#.......#...#...#......##.#.#...........#..###......
+.........#............#...##.........#.#....#........#..........................#....#.#......#......#....#....#............#.#....
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+.......#...#.............#.#....###................#...#.................#.#.............#..................##...............#.....
+....#....##..............#......#.....#.....#...#..#............#...##.......#.#....#...#........##.#..#...............#...#.......
+.#..#....#............#.........#...........#......#...#............#...........#......##....#........#..........................#.
+....###...#.................#.......#............#.#.........#...................#.##............#....................#............
+........#...............................#..........#................#......#....#.............#..........##..........#.....#..##...
+....#.....###...................##..##.##...#..##...##...#....#.......#..................#........#..#...................#.........
+..#.#............#................#...#.#.......#.........#.....#.#.....#.............#.....#..#.....................#..##.........
+............#.#..#....................#.....#..........#.#...................#....................#..#.......................#..#..
+....#....#.....#..................##................#..#...#.......##...............#.....##..#................#..##..##...#.......
+..................#..............................##................#....#....#........................................#...#...##...
+.............##........................#....#........##......#.............#.#...#................#..........#..#.#.....#.......#..
+....#.#..#...#..#..................#..#..#..#.#......#..#..#.#.....####......#...........##.#....#..#..............#............#..
+.#...#.................................#............##...#....................#.#..#....#.......#................#..#..........#...
+..#.................#.................#...................#.#.......#....#...............#......#.#...............#................
+......###.....#.........#.................#.#.............#..#..#.......#.....#.............................#....##..##..#.........
+..........###....#.#.#....#........#............###..#.........#....#...........#.......#......#........#......#....#............#.
+.....##...#.#.##....................##...#.#..#......#.......#......#...#........#.....................#.......#......#.....##.....
+.#.....#..#...............................#....#.................................##...................#.......#...............#....
+.....................##.....#...................#......................#.#..#................................##....................
+....#....#..........#........#.........#...##..........#.....#..#..#.............#..##....................................#........
+..........#.#.............#.................#............#.....#......#...............................#.................#....#.#...
+......#...#.#.....#.#.##..#.#............###....#.....#................##......#.......#..#....................#.....#.............
+.....#....#....................#.....................#..........#.....#.............#..#.......................#.#.................
+......#....#...............................#...#........#.......................#....................##...#..#......#...##....#....
+....#..............#...........#................#.#......#........##...#..#....###..................#.........#.............#......
+......#....#....#.....#..##.#.#.............##.......#.......#....#...##..........................#....###...#...#.............#...
+.#....##......#........#.#..........#..........................................#................#..................#...............
+..#......#...#....#.......##.....#.....................#.....#.#..#...#...#......#.......................................#..#......
+......#..............#.......#.#..........................#.............#.......#.#.............#......#....................#..#...
+..#...#.........................#.#....#............................#.....................#.....#.................#................
+...................##......#.....#.............................#......##....#............#...#......................#..............
+......#...#..#.##.............#........#..#.........##...#....#......#..#......#..........#...........#..........#.#..#.#..........
+.#..#..#.........#.......#.......#.........#..........##...##...#.#...#........................................#....#..............
+.#..#.#.#....#......#................#........................#.#.....#........................#...#......................#......#.
+...............##...............##....................#..#.#.........................#.......#.......#...........#............#....
+..........#.........#.#.............#....#..#.#.............##....#......#.#.........................#..#.....#.......#........#...
+....##......#...#.............................#...............#......#................#.....................................#......
+....###.#..#.......#...................#....#..........................#..#..................#.....#....#.....#................#.#.
+............#.#..#.#.###........##..#.##...........................#.................#.#.............#.............#.....##........
+..#......#................................#.#.....................#......................#........#.....#.....#.#...#.....#........
+.............#..........#.#.##......#..#....................##................................#..............#......#...........##.
+.....#...#..............#..#....#..#..............................#..........................#.###..............#...##.....##......
+.#...#..#.......#.#...............#....#.....#..#....#..............#...................................................#.#.#......
+.......##.........#.#....#...........#.....#....#...............#....................#..................##......#........#.........
+...#.#.....#....#.................#..#................#........#..................#......#............#....#...........#..#........
+.....#...#..................#.......#.........#...#....#...................#...##..#.#....#....#.##..#..##.##..................#...
+.....................#..#...#.....#............#..........................#.##.....................#..#...#......##.....#.....#....
+..#........#.......##.#..............#..##................................#..#.#....#.....#...............#.................#.#....
+...#.................................#.........#...........................#....##.#...................#......##.................#.
+.........#..........#.#......#....##....#.#...#.........#................................#....#..#..............#....##...#........
+...................................................................................................................................
diff --git a/day21/uppga.c b/day21/uppga.c
@@ -0,0 +1,57 @@
+#include "common.h"
+
+static inline uint64_t nsize(graph_t *g, size_t start, size_t nsteps) {
+  size_t i;
+  SIMPLEQ_HEAD(listead, entry) head = SIMPLEQ_HEAD_INITIALIZER(head);
+  uint64_t count = 0;
+  entry_t *e = malloc(sizeof(*e));
+
+  e->node = start;
+  e->dist = 0;
+  SIMPLEQ_INSERT_TAIL(&head, e, entries);
+
+  set_u64p_t added;
+  set_u64p_init(&added);
+  uint64_t pp[2] = {e->node, e->dist};
+  le_t tt;
+  set_u64p_insert(&added, pp);
+
+  while (!SIMPLEQ_EMPTY(&head)) {
+    e = SIMPLEQ_FIRST(&head);
+    SIMPLEQ_REMOVE_HEAD(&head, entries);
+
+    if (e->dist < nsteps) {
+      for (i = 0; i < g->nbrs[e->node].nmemb; i++) {
+        pp[0] = g->nbrs[e->node].data[i];
+        pp[1] = e->dist + 1;
+        if (set_u64p_lookup(&tt, &added, pp) == SIZE_MAX) {
+          set_u64p_insert(&added, pp);
+          entry_t *ne = malloc(sizeof(*e));
+          ne->node = g->nbrs[e->node].data[i];
+          ne->dist = e->dist + 1;
+          SIMPLEQ_INSERT_TAIL(&head, ne, entries);
+        }
+      }
+    } else if (e->dist == nsteps) {
+      count++;
+    }
+
+    free(e);
+  }
+
+  set_u64p_clear(&added);
+
+  return count;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  graph_t g;
+  size_t start;
+  read_grid(&g, &start, lines, nlines);
+
+  uint64_t count = nsize(&g, start, 64);
+  printf("%llu\n", count);
+}
diff --git a/day21/uppgb.c b/day21/uppgb.c
@@ -0,0 +1,129 @@
+#include "common.h"
+
+static inline void bfsl(uint8_t *hitv, uint64_t *hitd, graph_t *g, size_t start,
+                        size_t lmt, size_t nr, size_t nc) {
+  size_t i;
+  SIMPLEQ_HEAD(listead, entry) head = SIMPLEQ_HEAD_INITIALIZER(head);
+
+  entry_t *e = malloc(sizeof(*e));
+  e->node = start;
+  e->dist = 0;
+  SIMPLEQ_INSERT_TAIL(&head, e, entries);
+
+  while (!SIMPLEQ_EMPTY(&head)) {
+    e = SIMPLEQ_FIRST(&head);
+    SIMPLEQ_REMOVE_HEAD(&head, entries);
+
+    if (e->dist < lmt) {
+      for (i = 0; i < g->nbrs[e->node].nmemb; i++) {
+        if (hitv[g->nbrs[e->node].data[i]] == 0) {
+          entry_t *ne = malloc(sizeof(*e));
+          ne->node = g->nbrs[e->node].data[i];
+          ne->dist = e->dist + 1;
+          hitv[ne->node] = 1;
+          hitd[ne->node] = ne->dist;
+          SIMPLEQ_INSERT_TAIL(&head, ne, entries);
+        }
+      }
+    }
+
+    free(e);
+  }
+}
+
+typedef struct u64p {
+  uint64_t x;
+  uint64_t y;
+} u64p_t;
+
+static inline u64p_t hitt(uint8_t *hitv, uint64_t *hitd, size_t nr, size_t nc) {
+  uint64_t ho = 0;
+  uint64_t he = 0;
+  size_t i;
+
+  for (i = 0; i < nr * nc; i++) {
+    if (hitv[i] == 1) {
+      if (hitd[i] % 2 == 0) {
+        he++;
+      } else {
+        ho++;
+      }
+    }
+  }
+
+  return (u64p_t){ho, he};
+}
+
+static inline u64p_t hlong(uint8_t *hitv, uint64_t *hitd, size_t nr, size_t nc,
+                           size_t v) {
+  uint64_t ho = 0;
+  uint64_t he = 0;
+  size_t i;
+
+  for (i = 0; i < nr * nc; i++) {
+    if (hitv[i] == 1 && hitd[i] > v) {
+      if (hitd[i] % 2 == 0) {
+        he++;
+      } else {
+        ho++;
+      }
+    }
+  }
+
+  return (u64p_t){ho, he};
+}
+
+/**
+ * This function asserts the magic properties we need
+ * to hold (magic in the sense as not in the specification,
+ * but perhaps observable) for this solution to be
+ * correct. I detest this non-general heuristic shit...
+ */
+static inline void assert_magic(char **lines, uint64_t nr, uint64_t nc,
+                                u64p_t start, uint64_t steps) {
+  assert(start.x == nr / 2);
+  assert(start.y == nc / 2);
+  assert(nr == nc);
+  assert(nr == 131);
+  assert(steps % nr == nr / 2);
+
+  assert(lines[start.x][start.y] == 'S');
+
+  size_t i;
+  // S is on clear row/col!!!
+  for (i = 0; i < nr; i++) {
+    assert(lines[i][start.y] == '.' || lines[i][start.y] == 'S');
+    assert(lines[start.x][i] == '.' || lines[start.x][i] == 'S');
+  }
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t i;
+  size_t nr = readlines(&lines, "input");
+  size_t nc = strlen(lines[0]) - 1;
+  uint64_t steps = 26501365;
+
+  uint8_t hitv[nr * nc];
+  memset(hitv, 0, nr * nc);
+  uint64_t hitd[nr * nc];
+  for (i = 0; i < nr * nc; i++)
+    hitd[i] = UINT64_MAX;
+
+  u64p_t sstart = {65, 65};
+  assert_magic(lines, nr, nc, sstart, steps);
+
+  graph_t g;
+  size_t start;
+  read_grid(&g, &start, lines, nc);
+
+  bfsl(hitv, hitd, &g, start, 131, nr, nc);
+
+  u64p_t c = hitt(hitv, hitd, nr, nc);
+  u64p_t uh = hlong(hitv, hitd, nr, nc, 65);
+
+  uint64_t x = steps / nr;
+  uint64_t v =
+      c.x * (x + 1) * (x + 1) + c.y * x * x - (x + 1) * uh.x + x * uh.y;
+  printf("%llu\n", v);
+}
diff --git a/day22/Makefile b/day22/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o ../utils/stack_u64.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day22/common.c b/day22/common.c
@@ -0,0 +1,92 @@
+#include "common.h"
+
+static inline void order_interval(iv_t *iv) {
+  if (iv->lb > iv->ub) {
+    uint64_t tmp = iv->ub;
+    iv->ub = iv->lb;
+    iv->lb = tmp;
+  }
+}
+
+static inline void order_brick(brick_t *b) {
+  size_t i;
+  for (i = 0; i < 3; i++)
+    order_interval(&(b->ivs[i]));
+}
+
+static int brick_cmp_z(const void *a, const void *b) {
+  const brick_t *aa = (const brick_t *)a;
+  const brick_t *bb = (const brick_t *)b;
+
+  return aa->ivs[2].lb < bb->ivs[2].lb ? -1 : 1;
+}
+
+void sort_bricks(brick_t *bricks, const size_t n) {
+  qsort(bricks, n, sizeof(bricks[0]), brick_cmp_z);
+}
+
+void read_bricks(brick_t *bricks, char **lines, const size_t nlines) {
+  size_t i;
+  char *cp;
+
+  for (i = 0; i < nlines; i++) {
+    cp = lines[i];
+    cp = sread_next_u64(&bricks[i].ivs[0].lb, cp);
+    assert(cp != NULL);
+    cp = sread_next_u64(&bricks[i].ivs[1].lb, cp);
+    assert(cp != NULL);
+    cp = sread_next_u64(&bricks[i].ivs[2].lb, cp);
+    assert(cp != NULL);
+    cp = sread_next_u64(&bricks[i].ivs[0].ub, cp);
+    assert(cp != NULL);
+    cp = sread_next_u64(&bricks[i].ivs[1].ub, cp);
+    assert(cp != NULL);
+    cp = sread_next_u64(&bricks[i].ivs[2].ub, cp);
+
+    order_brick(&bricks[i]);
+  }
+}
+
+static inline int iv_nei(const iv_t *a, const iv_t *b) {
+  return (a->lb <= b->ub) && (b->lb <= a->ub);
+}
+
+int brick_nei(const brick_t *a, const brick_t *b) {
+  return iv_nei(&(a->ivs[0]), &(b->ivs[0])) &&
+         iv_nei(&(a->ivs[1]), &(b->ivs[1])) &&
+         iv_nei(&(a->ivs[2]), &(b->ivs[2]));
+}
+
+void gravitize(brick_t *a) {
+  a->ivs[2].lb--;
+  a->ivs[2].ub--;
+}
+
+int may_gravitize(const brick_t *a, const brick_t *landed,
+                  const size_t nlanded) {
+  size_t i;
+
+  if (a->ivs[2].lb <= 1)
+    return 0;
+
+  brick_t b = *a;
+  gravitize(&b);
+
+  for (i = 0; i < nlanded; i++) {
+    if (brick_nei(&b, &landed[i]))
+      return 0;
+  }
+
+  return 1;
+}
+
+void gravitize_all(brick_t *bricks, const size_t n) {
+  // assume sorted by l.b. on z, increasingly
+  size_t i;
+
+  for (i = 0; i < n; i++) {
+    while (may_gravitize(&bricks[i], bricks, i)) {
+      gravitize(&bricks[i]);
+    }
+  }
+}
diff --git a/day22/common.h b/day22/common.h
@@ -0,0 +1,29 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <reading.h>
+#include <stack_u64.h>
+
+typedef struct interval {
+  uint64_t lb;
+  uint64_t ub;
+} iv_t;
+
+typedef struct brick {
+  iv_t ivs[3];
+} brick_t;
+
+void read_bricks(brick_t *bricks, char **lines, const size_t nlines);
+void sort_bricks(brick_t *bricks, const size_t n);
+void gravitize(brick_t *a);
+int may_gravitize(const brick_t *a, const brick_t *landed,
+                  const size_t nlanded);
+void gravitize_all(brick_t *bricks, const size_t n);
+int brick_nei(const brick_t *a, const brick_t *b);
+
+#endif
diff --git a/day22/exinput b/day22/exinput
@@ -0,0 +1,7 @@
+1,0,1~1,2,1
+0,0,2~2,0,2
+0,2,3~2,2,3
+0,0,4~0,2,4
+2,0,5~2,2,5
+0,1,6~2,1,6
+1,1,8~1,1,9
diff --git a/day22/input b/day22/input
@@ -0,0 +1,1203 @@
+7,3,85~9,3,85
+2,8,123~4,8,123
+8,2,69~8,2,72
+3,1,280~3,4,280
+4,1,6~4,2,6
+7,1,156~7,3,156
+1,5,105~4,5,105
+5,8,69~5,8,69
+5,0,255~5,3,255
+2,8,120~3,8,120
+3,3,202~5,3,202
+0,5,80~2,5,80
+5,9,123~6,9,123
+6,1,249~9,1,249
+9,4,100~9,6,100
+4,4,124~6,4,124
+3,4,222~3,4,223
+4,5,284~4,8,284
+3,5,44~5,5,44
+3,2,132~3,5,132
+5,2,127~7,2,127
+0,2,11~0,3,11
+4,7,151~5,7,151
+0,3,232~0,5,232
+0,9,34~3,9,34
+2,1,195~4,1,195
+0,0,50~0,3,50
+6,4,234~6,7,234
+3,5,234~3,6,234
+5,2,213~8,2,213
+4,2,223~4,5,223
+8,3,9~8,4,9
+2,2,292~2,4,292
+5,7,261~6,7,261
+4,5,263~4,7,263
+7,0,137~9,0,137
+6,0,4~6,0,4
+2,7,282~4,7,282
+9,3,291~9,4,291
+0,8,163~2,8,163
+4,9,111~7,9,111
+3,7,104~4,7,104
+9,0,34~9,3,34
+1,5,57~3,5,57
+8,5,214~9,5,214
+9,5,279~9,8,279
+2,4,206~4,4,206
+5,1,136~5,2,136
+1,2,219~1,3,219
+4,2,143~6,2,143
+4,8,195~6,8,195
+5,1,85~8,1,85
+4,4,10~4,4,11
+5,6,91~8,6,91
+1,6,51~1,6,51
+3,9,237~5,9,237
+3,5,264~3,6,264
+7,3,232~9,3,232
+4,1,192~6,1,192
+2,2,232~5,2,232
+7,4,287~7,7,287
+4,8,63~4,9,63
+3,5,295~6,5,295
+4,6,39~4,9,39
+8,7,217~8,9,217
+6,7,229~8,7,229
+4,4,184~4,5,184
+6,3,236~8,3,236
+8,6,13~9,6,13
+0,3,12~0,4,12
+5,7,9~5,7,12
+1,3,151~1,5,151
+3,9,71~4,9,71
+2,8,60~4,8,60
+3,2,102~3,5,102
+3,6,26~6,6,26
+4,7,113~4,9,113
+7,1,268~7,1,270
+3,4,69~5,4,69
+7,6,165~9,6,165
+7,7,131~7,9,131
+8,5,74~8,7,74
+1,8,222~4,8,222
+3,3,189~3,5,189
+5,6,215~5,8,215
+5,5,111~6,5,111
+2,8,57~5,8,57
+3,3,101~3,4,101
+7,1,252~8,1,252
+0,0,2~3,0,2
+0,5,86~0,7,86
+7,1,229~9,1,229
+0,6,124~2,6,124
+8,3,32~9,3,32
+8,5,229~8,6,229
+7,4,285~7,6,285
+6,3,187~6,6,187
+2,5,237~4,5,237
+2,1,294~4,1,294
+1,5,241~3,5,241
+3,2,4~3,5,4
+0,4,44~3,4,44
+5,4,74~5,6,74
+4,7,154~6,7,154
+5,0,80~6,0,80
+2,2,234~2,4,234
+5,3,57~5,6,57
+8,3,148~8,5,148
+1,7,60~2,7,60
+0,0,3~0,0,4
+4,6,84~4,8,84
+6,0,140~7,0,140
+1,6,252~1,7,252
+3,7,276~3,9,276
+7,8,1~8,8,1
+3,5,187~4,5,187
+3,6,29~3,9,29
+2,1,233~4,1,233
+3,3,133~5,3,133
+5,6,128~5,6,131
+2,2,235~4,2,235
+2,4,7~4,4,7
+1,1,260~1,3,260
+8,7,176~9,7,176
+7,7,64~8,7,64
+4,8,10~6,8,10
+0,1,234~3,1,234
+3,7,33~3,9,33
+7,7,71~7,9,71
+0,5,179~1,5,179
+3,2,32~5,2,32
+5,7,3~7,7,3
+6,1,258~9,1,258
+5,4,258~5,7,258
+2,6,217~2,8,217
+0,4,131~0,4,133
+8,0,242~8,0,244
+9,4,262~9,7,262
+2,5,6~5,5,6
+8,3,159~8,5,159
+4,2,78~7,2,78
+6,0,235~8,0,235
+5,4,64~5,4,66
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+4,0,35~7,0,35
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+5,6,62~7,6,62
+0,5,247~3,5,247
+3,2,129~5,2,129
+2,0,271~5,0,271
+0,9,242~1,9,242
+3,0,120~5,0,120
+6,4,113~8,4,113
+5,6,256~8,6,256
+2,0,166~2,4,166
+1,2,186~4,2,186
+8,5,270~8,7,270
+5,0,195~7,0,195
+4,0,273~4,0,275
+3,7,114~5,7,114
+4,2,217~4,5,217
+0,4,201~0,6,201
+0,9,204~2,9,204
+4,3,32~4,5,32
+6,6,274~6,8,274
+3,7,228~3,8,228
+8,0,161~9,0,161
+4,5,224~4,7,224
+1,0,55~1,2,55
+5,8,101~7,8,101
+9,6,19~9,6,20
+6,0,264~7,0,264
+7,7,233~7,9,233
+2,3,136~4,3,136
+6,4,156~8,4,156
+5,1,269~5,2,269
+5,8,99~5,8,99
+5,8,28~7,8,28
+7,6,190~8,6,190
+0,3,217~1,3,217
+0,1,130~0,5,130
+1,2,63~3,2,63
+2,1,232~3,1,232
+0,5,137~0,7,137
+2,1,235~2,1,237
+4,4,65~4,5,65
+5,2,24~9,2,24
+4,7,234~5,7,234
+8,6,121~8,9,121
+1,6,282~1,6,285
+0,6,131~0,6,131
+1,6,44~1,6,47
+3,7,6~6,7,6
+4,9,106~4,9,108
+0,8,147~2,8,147
+2,2,217~2,4,217
+2,3,218~4,3,218
+8,4,55~9,4,55
+7,6,180~7,7,180
+2,1,87~2,3,87
+6,5,293~8,5,293
+5,4,228~7,4,228
+3,2,249~6,2,249
+5,4,126~7,4,126
+3,8,12~5,8,12
+1,8,287~3,8,287
+7,6,227~7,9,227
+9,2,126~9,4,126
+1,3,139~1,4,139
+3,0,201~6,0,201
+3,7,13~5,7,13
+4,6,274~4,8,274
+2,6,278~2,8,278
+0,3,159~2,3,159
+6,2,81~6,3,81
+0,6,172~0,8,172
+9,0,3~9,2,3
+0,3,250~0,3,252
+5,6,80~5,8,80
+6,4,96~7,4,96
+2,1,229~2,2,229
+1,6,82~3,6,82
+2,8,105~3,8,105
+6,7,157~9,7,157
+5,7,220~8,7,220
+4,0,278~4,0,281
+2,3,157~5,3,157
+2,4,99~5,4,99
+9,2,129~9,4,129
+0,1,197~3,1,197
+1,5,56~2,5,56
+6,5,8~6,8,8
+1,5,9~1,7,9
+4,7,232~6,7,232
+5,4,25~5,6,25
+7,1,3~8,1,3
+2,2,250~2,4,250
+3,2,29~5,2,29
+3,7,284~3,8,284
+1,7,228~1,8,228
+8,5,265~8,7,265
+8,7,51~8,7,53
+4,4,12~7,4,12
+0,3,49~2,3,49
+1,4,81~1,6,81
+1,3,265~1,3,268
+9,7,186~9,9,186
+6,8,217~6,9,217
+2,1,20~2,3,20
+4,6,96~7,6,96
+5,9,135~5,9,135
+8,2,31~9,2,31
+7,2,202~7,5,202
+7,1,234~7,3,234
+3,1,143~3,3,143
+4,8,102~4,9,102
+6,3,63~6,5,63
+2,5,135~5,5,135
+3,1,268~5,1,268
+1,6,138~1,7,138
+2,7,288~3,7,288
+7,2,151~7,4,151
+9,5,168~9,7,168
+0,4,190~2,4,190
+7,2,27~7,2,29
+8,1,206~9,1,206
+6,0,135~6,3,135
+2,8,165~2,8,166
+5,0,265~6,0,265
+3,2,113~5,2,113
+7,5,212~7,7,212
+0,1,185~0,2,185
+0,1,56~0,3,56
+7,5,7~8,5,7
+5,3,59~8,3,59
+0,3,141~0,6,141
+4,5,177~7,5,177
+0,9,198~3,9,198
+7,5,227~9,5,227
+4,8,267~6,8,267
+8,7,59~8,7,61
+0,2,243~0,4,243
+1,7,80~2,7,80
+6,1,64~6,3,64
+1,6,286~1,7,286
+4,5,240~4,5,242
+6,1,277~6,3,277
+9,3,6~9,7,6
+6,9,238~8,9,238
+5,1,30~6,1,30
+6,4,272~6,6,272
+5,4,85~5,7,85
+1,4,14~1,6,14
+5,5,200~6,5,200
+6,5,183~6,9,183
+0,0,58~2,0,58
+4,1,85~4,1,87
+3,5,141~4,5,141
+5,3,277~5,3,279
+7,6,51~7,8,51
+3,9,130~5,9,130
+5,1,84~5,3,84
+9,4,277~9,6,277
+9,0,87~9,2,87
+1,3,149~3,3,149
+2,4,40~4,4,40
+8,5,213~8,8,213
+6,4,289~9,4,289
+0,3,193~2,3,193
+9,7,171~9,9,171
+7,9,134~9,9,134
+1,7,218~2,7,218
+2,6,36~6,6,36
+0,8,148~3,8,148
+3,8,176~6,8,176
+8,6,69~8,7,69
+6,5,6~6,6,6
+0,1,54~0,3,54
+2,1,60~2,3,60
+1,1,205~5,1,205
+2,6,58~2,8,58
+2,7,170~3,7,170
+6,7,98~6,7,100
+5,0,33~7,0,33
+2,5,179~4,5,179
+1,0,83~1,2,83
+4,2,211~6,2,211
+0,0,239~0,2,239
+3,7,115~3,8,115
+3,7,165~6,7,165
+7,0,32~9,0,32
+0,7,106~3,7,106
+0,6,6~0,8,6
+0,0,157~0,1,157
+6,8,138~8,8,138
+8,8,3~8,9,3
+8,2,63~8,3,63
+1,1,111~1,1,114
+4,2,12~6,2,12
+0,7,169~1,7,169
+6,0,2~7,0,2
+7,7,70~8,7,70
+1,0,111~2,0,111
+0,5,253~2,5,253
+2,3,122~2,6,122
+6,5,53~6,7,53
+6,4,261~6,5,261
+2,2,283~4,2,283
+2,5,228~2,6,228
+4,5,225~6,5,225
+1,6,136~1,8,136
+7,5,110~7,6,110
+8,0,281~8,0,283
+2,1,24~5,1,24
+0,1,200~0,4,200
+5,7,284~7,7,284
+3,3,49~3,3,50
+5,3,293~5,5,293
+5,5,180~8,5,180
+1,1,81~3,1,81
+2,2,285~2,2,287
+1,6,288~3,6,288
+9,1,47~9,1,50
+2,1,189~4,1,189
+1,3,140~3,3,140
+4,4,121~4,4,123
+2,7,31~2,7,32
+8,7,268~8,7,268
+2,5,215~5,5,215
+9,0,42~9,2,42
+6,4,206~9,4,206
+4,6,169~4,7,169
+3,9,239~7,9,239
+5,5,210~8,5,210
+5,7,180~5,7,182
+4,0,251~4,3,251
+8,1,205~9,1,205
+3,7,53~3,9,53
+1,8,1~4,8,1
+2,5,207~5,5,207
+5,6,207~7,6,207
+0,6,224~0,7,224
+0,3,62~0,4,62
+9,5,1~9,5,3
+4,9,126~7,9,126
+0,6,8~0,8,8
+7,4,257~7,4,260
+2,4,142~2,4,144
+2,1,270~2,3,270
+0,4,56~1,4,56
+4,4,224~6,4,224
+8,3,231~8,4,231
+4,2,214~4,3,214
+5,1,133~7,1,133
+5,6,126~7,6,126
+4,1,5~7,1,5
+1,2,202~1,2,204
+5,7,292~7,7,292
+7,0,47~7,1,47
+3,5,285~5,5,285
+6,6,121~6,9,121
+3,4,106~3,6,106
+0,4,121~1,4,121
+1,7,244~3,7,244
+1,1,249~4,1,249
+1,2,76~1,4,76
+5,5,171~7,5,171
+8,2,78~8,2,80
+8,3,12~8,4,12
+0,0,97~0,0,100
+1,0,114~2,0,114
+0,0,122~2,0,122
+2,5,129~4,5,129
+1,4,137~3,4,137
+9,2,123~9,4,123
+3,4,290~5,4,290
+9,5,72~9,6,72
+0,7,170~0,8,170
+7,1,226~7,3,226
+2,4,81~2,6,81
+0,6,72~3,6,72
+6,3,145~6,5,145
+5,6,77~5,8,77
+0,0,237~0,3,237
+3,4,271~4,4,271
+4,4,60~6,4,60
+8,4,116~8,7,116
+5,5,223~8,5,223
+6,1,251~6,4,251
+2,9,182~5,9,182
+2,0,163~2,1,163
+8,0,12~8,1,12
+1,6,289~1,8,289
+4,7,116~5,7,116
+3,9,73~3,9,74
+4,4,67~6,4,67
+1,0,3~3,0,3
+3,1,46~3,4,46
+0,5,8~3,5,8
+1,2,53~4,2,53
+1,9,65~3,9,65
+8,2,162~8,3,162
+7,7,77~9,7,77
+6,4,197~6,7,197
+6,0,145~8,0,145
+6,4,269~9,4,269
+0,4,127~0,7,127
+8,5,267~8,8,267
+6,0,236~8,0,236
+4,0,56~4,3,56
+0,6,202~0,7,202
+6,3,3~6,5,3
+2,7,63~2,9,63
+3,5,73~3,8,73
+3,3,210~4,3,210
+4,1,114~4,1,115
+6,0,79~6,2,79
+0,2,221~1,2,221
+7,9,277~7,9,278
+2,4,72~5,4,72
+7,9,129~9,9,129
+0,4,196~0,6,196
+0,3,194~0,5,194
+4,7,67~4,9,67
+3,6,261~5,6,261
+3,0,256~3,1,256
+3,0,228~5,0,228
+1,1,252~3,1,252
+2,6,242~2,7,242
+2,1,167~3,1,167
+5,3,11~5,5,11
+7,3,223~9,3,223
+7,6,235~7,8,235
+1,9,66~2,9,66
+2,6,248~5,6,248
+5,2,76~5,5,76
+9,6,21~9,6,23
+2,7,2~2,9,2
+4,4,198~4,6,198
+5,8,199~5,9,199
+0,1,184~0,3,184
+0,1,293~3,1,293
+1,3,74~1,6,74
+4,4,201~5,4,201
+0,1,160~2,1,160
+9,0,41~9,3,41
+4,2,284~4,3,284
+2,0,61~5,0,61
+0,6,276~3,6,276
+6,7,237~8,7,237
+2,6,71~5,6,71
+5,4,287~6,4,287
+3,5,68~3,6,68
+3,7,201~5,7,201
+3,8,48~5,8,48
+4,4,86~7,4,86
+3,5,235~3,7,235
+4,2,152~8,2,152
+6,4,135~8,4,135
+6,2,85~8,2,85
+7,0,248~7,3,248
+0,3,59~0,4,59
+7,9,280~9,9,280
+8,2,164~8,3,164
+2,7,280~2,7,281
+0,6,130~0,8,130
+4,1,175~6,1,175
+1,2,124~1,4,124
+0,8,10~0,9,10
+3,3,117~3,6,117
+0,5,142~0,5,143
+6,6,27~6,8,27
+0,6,250~2,6,250
+1,8,227~1,9,227
+1,8,4~1,8,6
+0,8,107~2,8,107
+6,3,265~8,3,265
+3,6,237~6,6,237
+3,5,192~3,8,192
+6,0,8~6,1,8
+6,0,263~6,3,263
+5,7,196~5,9,196
+6,6,159~6,8,159
+5,3,248~5,5,248
+1,8,99~4,8,99
+5,5,129~6,5,129
+8,4,224~8,4,227
+0,1,154~0,4,154
+7,5,224~9,5,224
+2,7,158~5,7,158
+5,3,205~7,3,205
+2,6,144~2,8,144
+6,4,47~6,7,47
+5,3,275~5,6,275
+2,5,27~6,5,27
+8,0,139~9,0,139
+6,5,139~8,5,139
+8,3,219~9,3,219
+6,2,29~6,4,29
+2,1,187~2,4,187
+5,6,93~8,6,93
+6,5,142~8,5,142
+2,7,49~5,7,49
+6,2,250~8,2,250
+4,0,83~6,0,83
+6,0,280~9,0,280
+4,7,44~6,7,44
+1,0,264~1,3,264
+0,3,255~0,4,255
+6,6,1~8,6,1
+2,5,239~2,8,239
+7,3,221~7,6,221
+8,0,102~8,2,102
+7,7,182~9,7,182
+1,3,123~3,3,123
+0,7,135~2,7,135
+1,7,78~3,7,78
+4,5,196~7,5,196
+1,2,296~4,2,296
+0,1,21~3,1,21
+8,7,67~8,9,67
+5,9,185~7,9,185
+2,5,227~2,8,227
+9,4,275~9,7,275
+4,3,231~4,3,233
+9,3,131~9,4,131
+4,2,108~6,2,108
+7,6,209~7,6,210
+4,5,204~6,5,204
+7,4,52~7,6,52
+6,0,193~6,2,193
+8,7,215~8,8,215
+4,4,28~6,4,28
+2,3,45~2,5,45
+1,4,188~2,4,188
+0,2,269~0,4,269
+9,2,130~9,4,130
+9,4,263~9,6,263
+8,5,263~8,8,263
+7,3,42~7,6,42
+5,1,173~5,5,173
+3,3,227~3,6,227
+2,2,208~4,2,208
+3,2,220~4,2,220
+1,0,229~2,0,229
+5,0,279~7,0,279
+6,6,104~7,6,104
+1,2,26~5,2,26
+8,1,259~8,4,259
+6,7,49~8,7,49
+1,5,48~1,7,48
+6,3,82~9,3,82
+6,6,175~8,6,175
+2,0,36~2,2,36
+4,9,288~4,9,289
+0,6,5~2,6,5
+3,7,160~3,7,162
+8,3,125~8,4,125
+8,2,75~8,3,75
+0,5,279~0,7,279
+6,5,120~6,6,120
+8,7,158~9,7,158
+5,6,189~8,6,189
+8,1,25~8,2,25
+0,0,91~2,0,91
+2,3,77~5,3,77
+1,3,214~3,3,214
+2,7,155~5,7,155
+5,1,252~5,4,252
+2,8,102~2,9,102
+7,1,44~7,3,44
+5,6,174~8,6,174
+7,4,291~7,7,291
+2,7,55~2,8,55
+3,1,253~3,1,253
+4,9,274~7,9,274
+3,6,272~5,6,272
+6,4,89~9,4,89
+6,5,75~8,5,75
+4,5,245~5,5,245
+4,1,255~4,4,255
+1,8,248~1,8,249
+0,7,253~0,9,253
+3,4,29~4,4,29
+8,0,9~8,2,9
diff --git a/day22/uppga.c b/day22/uppga.c
@@ -0,0 +1,54 @@
+#include "common.h"
+
+static void supporting(stack_u64 *s, stack_u64 *t, brick_t *bricks, size_t n) {
+  size_t i, j;
+  brick_t b;
+
+  for (i = 0; i < n; i++) {
+    if (bricks[i].ivs[2].lb > 1) {
+      b = bricks[i];
+      gravitize(&b);
+
+      for (j = 0; j < n; j++) {
+        if (i != j && brick_nei(&b, &bricks[j])) {
+          stack_u64_push(s, i);
+          stack_u64_push(t, j);
+        }
+      }
+    }
+  }
+}
+
+int main(int argc, char **argv) {
+  size_t i;
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  brick_t bricks[nlines];
+  read_bricks(bricks, lines, nlines);
+  sort_bricks(bricks, nlines);
+  gravitize_all(bricks, nlines);
+
+  stack_u64 s, t;
+  stack_u64_init(&s);
+  stack_u64_init(&t);
+  supporting(&s, &t, bricks, nlines);
+
+  uint64_t deg[nlines];
+  memset(deg, 0, nlines * sizeof(*deg));
+  for (i = 0; i < s.nmemb; i++)
+    deg[s.data[i]]++;
+
+  uint8_t unsafe[nlines];
+  memset(unsafe, 0, nlines);
+  for (i = 0; i < s.nmemb; i++)
+    if (deg[s.data[i]] == 1)
+      unsafe[t.data[i]] = 1;
+
+  uint64_t count = 0;
+  for (i = 0; i < nlines; i++)
+    if (!unsafe[i])
+      count++;
+
+  printf("%lld\n", count);
+}
diff --git a/day22/uppgb.c b/day22/uppgb.c
@@ -0,0 +1,61 @@
+#include "common.h"
+
+static inline void gravitize_all_ind(uint8_t *ind, brick_t *bricks,
+                                     const size_t n) {
+  // assume sorted by l.b. on z, increasingly
+  size_t i;
+  memset(ind, 0, n);
+
+  for (i = 0; i < n; i++) {
+    while (may_gravitize(&bricks[i], bricks, i)) {
+      gravitize(&bricks[i]);
+      ind[i] = 1;
+    }
+  }
+}
+
+static uint64_t remcnt(brick_t *bricks, size_t n) {
+  size_t i, j;
+  brick_t b[n - 1];
+  uint8_t ind[n - 1];
+  uint64_t fallen;
+  uint64_t tot = 0;
+
+  for (i = 0; i < n; i++) {
+    // copy all but brick i
+    size_t jc = 0;
+    for (j = 0; j < n; j++) {
+      if (j != i) {
+        b[jc] = bricks[j];
+        jc++;
+      }
+    }
+
+    // gravitize all
+    gravitize_all_ind(ind, b, n - 1);
+
+    // count number of fallen
+    fallen = 0;
+    for (j = 0; j < n - 1; j++) {
+      if (ind[j])
+        fallen++;
+    }
+
+    tot += fallen;
+  }
+
+  return tot;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  brick_t bricks[nlines];
+  read_bricks(bricks, lines, nlines);
+  sort_bricks(bricks, nlines);
+  gravitize_all(bricks, nlines);
+
+  uint64_t count = remcnt(bricks, nlines);
+  printf("%lld\n", count);
+}
diff --git a/day23/Makefile b/day23/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o ../utils/dg.o ../utils/stack_u64.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day23/common.c b/day23/common.c
@@ -0,0 +1,34 @@
+#include "common.h"
+
+size_t idx(size_t row, size_t col, size_t ncols) { return row * ncols + col; }
+
+int walkable(char **lines, size_t r, size_t c) {
+  return lines[r][c] == '.' || lines[r][c] == '<' || lines[r][c] == '>' ||
+         lines[r][c] == '^' || lines[r][c] == 'v';
+}
+
+/**
+ * This is a terrible solution, essentially
+ * brute force, recursively. Could replace with
+ * dyn.prog.
+ */
+void recursive_longest_path(uint8_t *visited, size_t node, size_t end,
+                            size_t steps, const dg_t *g, size_t *l) {
+  size_t i;
+  visited[node] = 1;
+
+  if (node == end) {
+    if (*l < steps) {
+      *l = steps;
+    }
+  } else {
+    for (i = 0; i < g->nbrs[node].nmemb; i++) {
+      size_t nbr = g->nbrs[node].data[i];
+      if (visited[nbr] == 0) {
+        recursive_longest_path(visited, nbr, end, steps + 1, g, l);
+      }
+    }
+  }
+
+  visited[node] = 0;
+}
diff --git a/day23/common.h b/day23/common.h
@@ -0,0 +1,17 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <dg.h>
+#include <reading.h>
+
+size_t idx(size_t row, size_t col, size_t ncols);
+int walkable(char **lines, size_t r, size_t c);
+void recursive_longest_path(uint8_t *visited, size_t node, size_t end,
+                            size_t steps, const dg_t *g, size_t *l);
+
+#endif
diff --git a/day23/exinput b/day23/exinput
@@ -0,0 +1,23 @@
+#.#####################
+#.......#########...###
+#######.#########.#.###
+###.....#.>.>.###.#.###
+###v#####.#v#.###.#.###
+###.>...#.#.#.....#...#
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+###...#.#.#.......#...#
+#####.#.#.#######.#.###
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+#.#####.#.#.#########v#
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+#...#...#.#.>.>.#.>.###
+#.###.###.#.###.#.#v###
+#.....###...###...#...#
+#####################.#
diff --git a/day23/input b/day23/input
@@ -0,0 +1,141 @@
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diff --git a/day23/uppga.c b/day23/uppga.c
@@ -0,0 +1,58 @@
+#include "common.h"
+
+static inline void edge_adder(dg_t *g, char **lines, size_t nlines,
+                              size_t ncols, size_t row, size_t col) {
+  char c = lines[row][col];
+  // north
+  if (c != '<' && c != '>' && c != 'v' && row > 0 &&
+      walkable(lines, row - 1, col)) {
+    dg_add_edge(g, idx(row, col, ncols), idx(row - 1, col, ncols));
+  }
+
+  // east
+  if (c != '^' && c != '<' && c != 'v' && col < ncols - 1 &&
+      walkable(lines, row, col + 1)) {
+    dg_add_edge(g, idx(row, col, ncols), idx(row, col + 1, ncols));
+  }
+
+  // south
+  if (c != '^' && c != '<' && c != '>' && row < nlines - 1 &&
+      walkable(lines, row + 1, col)) {
+    dg_add_edge(g, idx(row, col, ncols), idx(row + 1, col, ncols));
+  }
+
+  // west
+  if (c != 'v' && c != '>' && c != '^' && col > 0 &&
+      walkable(lines, row, col - 1)) {
+    dg_add_edge(g, idx(row, col, ncols), idx(row, col - 1, ncols));
+  }
+}
+
+static inline void read_grid(dg_t *g, char **lines, size_t nlines) {
+  size_t i, j;
+  size_t ncols = strlen(lines[0]) - 1;
+
+  dg_init(g, nlines * ncols);
+  for (i = 0; i < nlines; i++) {
+    for (j = 0; j < ncols; j++) {
+      if (lines[i][j] == '.' || lines[i][j] == '>' || lines[i][j] == '<' ||
+          lines[i][j] == 'v' || lines[i][j] == '^')
+        edge_adder(g, lines, nlines, ncols, i, j);
+    }
+  }
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  dg_t g;
+  read_grid(&g, lines, nlines);
+
+  size_t l = 0;
+  uint8_t visited[g.n];
+  memset(visited, 0, g.n);
+  recursive_longest_path(visited, 1, g.n - 2, 0, &g, &l);
+
+  printf("%zu\n", l);
+}
diff --git a/day23/uppgb.c b/day23/uppgb.c
@@ -0,0 +1,54 @@
+#include "common.h"
+
+static inline void edge_adder(dg_t *g, char **lines, size_t nlines,
+                              size_t ncols, size_t row, size_t col) {
+  //  char c = lines[row][col];
+  // north
+  if (row > 0 && walkable(lines, row - 1, col)) {
+    dg_add_edge(g, idx(row, col, ncols), idx(row - 1, col, ncols));
+  }
+
+  // east
+  if (col < ncols - 1 && walkable(lines, row, col + 1)) {
+    dg_add_edge(g, idx(row, col, ncols), idx(row, col + 1, ncols));
+  }
+
+  // south
+  if (row < nlines - 1 && walkable(lines, row + 1, col)) {
+    dg_add_edge(g, idx(row, col, ncols), idx(row + 1, col, ncols));
+  }
+
+  // west
+  if (col > 0 && walkable(lines, row, col - 1)) {
+    dg_add_edge(g, idx(row, col, ncols), idx(row, col - 1, ncols));
+  }
+}
+
+static void read_grid(dg_t *g, char **lines, size_t nlines) {
+  size_t i, j;
+  size_t ncols = strlen(lines[0]) - 1;
+
+  dg_init(g, nlines * ncols);
+  for (i = 0; i < nlines; i++) {
+    for (j = 0; j < ncols; j++) {
+      if (lines[i][j] == '.' || lines[i][j] == '>' || lines[i][j] == '<' ||
+          lines[i][j] == 'v' || lines[i][j] == '^')
+        edge_adder(g, lines, nlines, ncols, i, j);
+    }
+  }
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  dg_t g;
+  read_grid(&g, lines, nlines);
+
+  size_t l = 0;
+  uint8_t visited[g.n];
+  memset(visited, 0, g.n);
+  recursive_longest_path(visited, 1, g.n - 2, 0, &g, &l);
+
+  printf("%zu\n", l);
+}
diff --git a/day24/Makefile b/day24/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include -I/usr/local/include/flint
+CFLAGS+=-I../utils
+LDFLAGS=-L/usr/local/lib -lflint
+
+UTILS=../utils/reading.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES) $(LDFLAGS)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES) $(LDFLAGS)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day24/common.c b/day24/common.c
@@ -0,0 +1,57 @@
+#include "common.h"
+
+static inline dline_t decode_line(char *line) {
+  char *cp = line;
+  dline_t res;
+
+  cp = sread_next_u64(&res.pt[0], cp);
+  cp = sread_next_u64(&res.pt[1], cp);
+  cp = sread_next_u64(&res.pt[2], cp);
+
+  cp = sread_next_i64(&res.dir[0], cp);
+  cp = sread_next_i64(&res.dir[1], cp);
+  cp = sread_next_i64(&res.dir[2], cp);
+
+  return res;
+}
+
+void read_pts(pt_t *pts, pt_t *dir, char **lines, size_t nlines) {
+  size_t i;
+  dline_t t;
+
+  for (i = 0; i < nlines; i++) {
+    t = decode_line(lines[i]);
+
+    fmpq_init(pts[i].c[0]);
+    fmpq_set_si(pts[i].c[0], t.pt[0], 1);
+    fmpq_init(pts[i].c[1]);
+    fmpq_set_si(pts[i].c[1], t.pt[1], 1);
+    fmpq_init(pts[i].c[2]);
+    fmpq_set_si(pts[i].c[2], t.pt[2], 1);
+
+    fmpq_init(dir[i].c[0]);
+    fmpq_set_si(dir[i].c[0], t.dir[0], 1);
+    fmpq_init(dir[i].c[1]);
+    fmpq_set_si(dir[i].c[1], t.dir[1], 1);
+    fmpq_init(dir[i].c[2]);
+    fmpq_set_si(dir[i].c[2], t.dir[2], 1);
+  }
+}
+
+/* DEBUG */
+void print_point(pt_t p) {
+  printf("(");
+  fmpq_print(p.c[0]);
+  printf(", ");
+  fmpq_print(p.c[1]);
+  printf(", ");
+  fmpq_print(p.c[2]);
+  printf(")");
+}
+
+void print_pp(pt_t p, pt_t q) {
+  print_point(p);
+  printf(" :: ");
+  print_point(q);
+  printf("\n");
+}
diff --git a/day24/common.h b/day24/common.h
@@ -0,0 +1,29 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <flint.h>
+#include <fmpq.h>
+#include <fmpq_mat.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <reading.h>
+
+typedef struct point3d {
+  fmpq_t c[3];
+} pt_t;
+
+typedef struct fromline {
+  uint64_t pt[3];
+  int64_t dir[3];
+} dline_t;
+
+void read_pts(pt_t *pts, pt_t *dir, char **lines, size_t nlines);
+
+/* DEBUG */
+void print_point(pt_t p);
+void print_pp(pt_t p, pt_t q);
+
+#endif
diff --git a/day24/exinput b/day24/exinput
@@ -0,0 +1,5 @@
+19, 13, 30 @ -2,  1, -2
+18, 19, 22 @ -1, -1, -2
+20, 25, 34 @ -2, -2, -4
+12, 31, 28 @ -1, -2, -1
+20, 19, 15 @  1, -5, -3
diff --git a/day24/input b/day24/input
@@ -0,0 +1,300 @@
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diff --git a/day24/uppga.c b/day24/uppga.c
@@ -0,0 +1,152 @@
+#include "common.h"
+
+static int inint(fmpq_t x, fmpq_t min, fmpq_t max) {
+  return (fmpq_cmp(min, x) <= 0) && (fmpq_cmp(x, max) <= 0);
+}
+
+static int online_segm(pt_t *a, pt_t *adir, fmpq_t min, fmpq_t max, pt_t bt) {
+  int ret = 0;
+
+  fmpq_t t;
+  fmpq_init(t);
+
+  fmpq_sub(t, bt.c[0], a->c[0]);
+  fmpq_div(t, t, adir->c[0]);
+
+  if (inint(t, min, max)) {
+    fmpq_mul(t, t, adir->c[1]);
+    fmpq_add(t, t, a->c[1]);
+    if (fmpq_cmp(bt.c[1], t) == 0) {
+      ret = 1;
+    }
+  }
+
+  fmpq_clear(t);
+  return ret;
+}
+
+static int para(pt_t *a, pt_t *adir, pt_t *b, pt_t *bdir, fmpq_t min,
+                fmpq_t max) {
+  int r = 0;
+  pt_t bt;
+  fmpq_init(bt.c[0]);
+  fmpq_init(bt.c[1]);
+  fmpq_init(bt.c[2]);
+
+  fmpq_mul(bt.c[0], bdir->c[0], min);
+  fmpq_add(bt.c[0], bt.c[0], b->c[0]);
+  fmpq_mul(bt.c[1], bdir->c[1], min);
+  fmpq_add(bt.c[1], bt.c[1], b->c[1]);
+  fmpq_mul(bt.c[2], bdir->c[2], min);
+  fmpq_add(bt.c[2], bt.c[2], b->c[2]);
+
+  if (online_segm(a, adir, min, max, bt)) {
+    r = 1;
+  }
+
+  fmpq_mul(bt.c[0], bdir->c[0], max);
+  fmpq_add(bt.c[0], bt.c[0], b->c[0]);
+  fmpq_mul(bt.c[1], bdir->c[1], max);
+  fmpq_add(bt.c[1], bt.c[1], b->c[1]);
+  fmpq_mul(bt.c[2], bdir->c[2], max);
+  fmpq_add(bt.c[2], bt.c[2], b->c[2]);
+
+  if (r == 0 && online_segm(a, adir, min, max, bt)) {
+    r = 2;
+  }
+
+  fmpq_mul(bt.c[0], adir->c[0], max);
+  fmpq_add(bt.c[0], bt.c[0], a->c[0]);
+  fmpq_mul(bt.c[1], adir->c[1], max);
+  fmpq_add(bt.c[1], bt.c[1], a->c[1]);
+  fmpq_mul(bt.c[2], adir->c[2], max);
+  fmpq_add(bt.c[2], bt.c[2], a->c[2]);
+
+  if (r == 0 && online_segm(b, bdir, min, max, bt)) {
+    r = 3;
+  }
+
+  fmpq_clear(bt.c[0]);
+  fmpq_clear(bt.c[1]);
+  fmpq_clear(bt.c[2]);
+
+  return r;
+}
+
+static int has_solution_in(pt_t *a, pt_t *adir, pt_t *b, pt_t *bdir, fmpq_t min,
+                           fmpq_t max) {
+  int r = 0;
+  fmpq_mat_t A, Ainv, B, x;
+  fmpq_t is[2];
+
+  fmpq_mat_init(A, 2, 2);
+  fmpq_mat_init(B, 2, 1);
+  fmpq_mat_init(x, 2, 1);
+  fmpq_mat_init(Ainv, 2, 2);
+  fmpq_init(is[0]);
+  fmpq_init(is[1]);
+
+  fmpq_set(fmpq_mat_entry(A, 0, 0), bdir->c[0]);
+  fmpq_set(fmpq_mat_entry(A, 0, 1), adir->c[0]);
+  fmpq_set(fmpq_mat_entry(A, 1, 0), bdir->c[1]);
+  fmpq_set(fmpq_mat_entry(A, 1, 1), adir->c[1]);
+  fmpq_sub(fmpq_mat_entry(B, 0, 0), a->c[0], b->c[0]);
+  fmpq_sub(fmpq_mat_entry(B, 1, 0), a->c[1], b->c[1]);
+
+  if (fmpq_mat_inv(Ainv, A) != 0) {
+    fmpq_mat_mul(x, Ainv, B);
+    if (!(fmpq_cmp_ui(fmpq_mat_entry(x, 0, 0), 0) < 0) &&
+        !(fmpq_cmp_ui(fmpq_mat_entry(x, 1, 0), 0) > 0)) {
+      fmpq_mul(is[0], bdir->c[0], fmpq_mat_entry(x, 0, 0));
+      fmpq_add(is[0], is[0], b->c[0]);
+
+      fmpq_mul(is[1], bdir->c[1], fmpq_mat_entry(x, 0, 0));
+      fmpq_add(is[1], is[1], b->c[1]);
+
+      if (inint(is[0], min, max) && inint(is[1], min, max)) {
+        r = 1;
+      }
+    }
+  } else {
+    r = para(a, adir, b, bdir, min, max);
+  }
+
+  fmpq_mat_clear(A);
+  fmpq_mat_clear(Ainv);
+  fmpq_mat_clear(B);
+  fmpq_mat_clear(x);
+  fmpq_clear(is[0]);
+  fmpq_clear(is[1]);
+
+  return r;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  pt_t pts[nlines], dir[nlines];
+  read_pts(pts, dir, lines, nlines);
+
+  size_t i, j;
+
+  fmpq_t min, max;
+  fmpq_init(min);
+  fmpq_init(max);
+  fmpq_set_ui(min, 200000000000000ULL, 1);
+  fmpq_set_ui(max, 400000000000000ULL, 1);
+
+  size_t count = 0;
+  for (i = 0; i < nlines; i++) {
+    for (j = i + 1; j < nlines; j++) {
+      if (has_solution_in(&pts[i], &dir[i], &pts[j], &dir[j], min, max)) {
+        count++;
+      }
+    }
+  }
+
+  fmpq_clear(min);
+  fmpq_clear(max);
+
+  printf("%lld\n", count);
+}
diff --git a/day24/uppgb.c b/day24/uppgb.c
@@ -0,0 +1,100 @@
+#include "common.h"
+
+static void systemsolver(fmpq_t res, pt_t *p, pt_t *d, size_t n) {
+  fmpq_mat_t A, x, b;
+  fmpq_mat_init(A, 6, 6); // should be enough unless linear dep
+  fmpq_mat_init(x, 6, 1);
+  fmpq_mat_init(b, 6, 1);
+
+  fmpq_t t;
+  fmpq_init(t);
+
+  size_t i, j;
+  size_t ii = 0;
+  for (i = 0; i < n; i++) {
+    for (j = i + 1; j < n; j++) {
+      // A[ii,0] = d[j,1] - d[i,1]
+      fmpq_sub(fmpq_mat_entry(A, ii, 0), d[j].c[1], d[i].c[1]);
+      // A[ii,1] = d[i,0] - d[j,0]
+      fmpq_sub(fmpq_mat_entry(A, ii, 1), d[i].c[0], d[j].c[0]);
+      // A[ii,2] = 0
+      fmpq_set_ui(fmpq_mat_entry(A, ii, 2), 0, 1);
+      // A[ii,3] = p[i,1] - p[j,1]
+      fmpq_sub(fmpq_mat_entry(A, ii, 3), p[i].c[1], p[j].c[1]);
+      // A[ii,4] = p[j,0] - p[i,0]
+      fmpq_sub(fmpq_mat_entry(A, ii, 4), p[j].c[0], p[i].c[0]);
+      // A[ii,5] = 0
+      fmpq_set_ui(fmpq_mat_entry(A, ii, 5), 0, 1);
+      // b[ii] = -d[i,1]p[i,0]+d[i,0]p[i,1]+d[j,1]p[j,0]-d[j,0]p[j,1]
+      fmpq_set_ui(fmpq_mat_entry(b, ii, 0), 0, 1);
+      fmpq_mul(t, d[i].c[1], p[i].c[0]);
+      fmpq_sub(fmpq_mat_entry(b, ii, 0), fmpq_mat_entry(b, ii, 0), t);
+      fmpq_mul(t, d[i].c[0], p[i].c[1]);
+      fmpq_add(fmpq_mat_entry(b, ii, 0), fmpq_mat_entry(b, ii, 0), t);
+      fmpq_mul(t, d[j].c[1], p[j].c[0]);
+      fmpq_add(fmpq_mat_entry(b, ii, 0), fmpq_mat_entry(b, ii, 0), t);
+      fmpq_mul(t, d[j].c[0], p[j].c[1]);
+      fmpq_sub(fmpq_mat_entry(b, ii, 0), fmpq_mat_entry(b, ii, 0), t);
+
+      ii++;
+      if (ii == 6)
+        break;
+
+      // A[ii,0] = d[j,2] - d[i,2]
+      fmpq_sub(fmpq_mat_entry(A, ii, 0), d[j].c[2], d[i].c[2]);
+      // A[ii,2] = d[i,0] - d[j,0]
+      fmpq_sub(fmpq_mat_entry(A, ii, 2), d[i].c[0], d[j].c[0]);
+      // A[ii,1] = 0
+      fmpq_set_ui(fmpq_mat_entry(A, ii, 1), 0, 1);
+      // A[ii,3] = p[i,2] - p[j,2]
+      fmpq_sub(fmpq_mat_entry(A, ii, 3), p[i].c[2], p[j].c[2]);
+      // A[ii,5] = p[j,0] - p[i,0]
+      fmpq_sub(fmpq_mat_entry(A, ii, 5), p[j].c[0], p[i].c[0]);
+      // A[ii,4] = 0
+      fmpq_set_ui(fmpq_mat_entry(A, ii, 4), 0, 1);
+      // b[ii] = -d[i,2]p[i,0]+d[i,0]p[i,2]+d[j,2]p[j,0]-d[j,0]p[j,2]
+      fmpq_set_ui(fmpq_mat_entry(b, ii, 0), 0, 1);
+      fmpq_mul(t, d[i].c[2], p[i].c[0]);
+      fmpq_sub(fmpq_mat_entry(b, ii, 0), fmpq_mat_entry(b, ii, 0), t);
+      fmpq_mul(t, d[i].c[0], p[i].c[2]);
+      fmpq_add(fmpq_mat_entry(b, ii, 0), fmpq_mat_entry(b, ii, 0), t);
+      fmpq_mul(t, d[j].c[2], p[j].c[0]);
+      fmpq_add(fmpq_mat_entry(b, ii, 0), fmpq_mat_entry(b, ii, 0), t);
+      fmpq_mul(t, d[j].c[0], p[j].c[2]);
+      fmpq_sub(fmpq_mat_entry(b, ii, 0), fmpq_mat_entry(b, ii, 0), t);
+
+      ii++;
+      if (ii == 6)
+        break;
+    }
+
+    if (ii == 6)
+      break;
+  }
+
+  fmpq_mat_solve(x, A, b);
+
+  fmpq_set(res, fmpq_mat_entry(x, 0, 0));
+  fmpq_add(res, res, fmpq_mat_entry(x, 1, 0));
+  fmpq_add(res, res, fmpq_mat_entry(x, 2, 0));
+
+  fmpq_mat_clear(x);
+  fmpq_clear(t);
+  fmpq_mat_clear(A);
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  pt_t p[nlines], d[nlines];
+  read_pts(p, d, lines, nlines);
+
+  fmpq_t res;
+  fmpq_init(res);
+
+  systemsolver(res, p, d, nlines);
+
+  fmpq_print(res);
+  printf("\n");
+}
diff --git a/day25/Makefile b/day25/Makefile
@@ -0,0 +1,26 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I/usr/local/include/igraph
+CFLAGS+=-L/usr/local/lib
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o ../utils/graph.o ../utils/stack_u64.o
+INCLUDES=-I../utils
+
+all: utils uppga
+
+uppga: $(UTILS) uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c $(UTILS) $(INCLUDES) -ligraph
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day25/common.h b/day25/common.h
@@ -0,0 +1,15 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <graph.h>
+#include <igraph.h>
+#include <reading.h>
+
+size_t fn(char **lines, size_t nlines);
+
+#endif
diff --git a/day25/exinput b/day25/exinput
@@ -0,0 +1,13 @@
+jqt: rhn xhk nvd
+rsh: frs pzl lsr
+xhk: hfx
+cmg: qnr nvd lhk bvb
+rhn: xhk bvb hfx
+bvb: xhk hfx
+pzl: lsr hfx nvd
+qnr: nvd
+ntq: jqt hfx bvb xhk
+nvd: lhk
+lsr: lhk
+rzs: qnr cmg lsr rsh
+frs: qnr lhk lsr
diff --git a/day25/input b/day25/input
@@ -0,0 +1,1220 @@
+mgz: mbb
+bll: chq kss
+knv: vrs gvd hcf
+lxq: kpc
+dvn: sfp rbx
+gss: pfp dts hkg rvr
+bqv: mjc bmn jlt
+txs: fpv vrn
+qpn: tvx
+vlh: lns vbx
+hsd: rts trh kdz
+crj: tml qvk zvj jcb
+dnt: bpc vmz
+hsv: hqp fth djt
+tjq: grs tpp pzd jkz
+rbz: tbb bcm pjp sgm
+vfg: gjc jnm hzd pdt
+szg: fpt qxc dqv jbp
+vjx: dtk lzz
+kjj: kxb cqs
+hzs: clk gdv
+knq: hbk nsm
+dsp: kpj frb bck tgv
+clx: sfh jnm
+ncb: rhp ghk
+fth: fxm
+vbl: vjh jlt rmf kdh
+hvb: gvn zmk hdp nmf
+fmp: ccn fjn mkd nxh pcz clt
+ktr: fxm xgf
+slr: dnz dnt dhz ggm
+ckf: vzc fnv
+pfh: sbx hzf vpp dhm dgh
+mbk: kxb
+svf: xxc
+pgt: pbl
+shq: fxj szx zhg
+bnl: pbl qsk mrz dnk znf
+rjx: gpn
+xzt: ptk
+jbl: chq
+cjp: vqh khh
+csz: jmn chq vpj jxr
+pjc: pdc xqt sbh
+bkz: cfg clb
+dtb: fmb vsb qfg lcr
+zmb: thk
+gch: njt
+cfx: tgn vfc shr
+vbr: rxf
+xkv: kgg
+cmd: rtn
+ffr: cpm znh mqz
+mcq: vml tgc lth gfb
+jtv: pdt
+brd: ggc
+xjs: rnd xcx hvv rpc
+njh: tqq kzx tnv ghc
+dvm: sjv bmb kzk
+fmm: hgp xgz vxq bxz
+vjn: hlg cpx fcp qqr
+qlf: rtn vlt dln vpv
+jpv: ntx fgg bhg
+bbm: mnl
+hjz: mhr dcg xtc
+dhf: hxj qxh ncb cjs
+xxq: rrd ffg ndx glq
+tgn: fpp
+lzr: hpm lsr jkq tms
+dtz: bhg rmf bjf
+jrm: vxn
+khj: sdp bcj dcm lbl
+mvv: rnn thk tcl kkn
+zjn: qxp qdf bpd
+ztg: lzx nmt dmg
+dlm: hzm szx cgn xxx sfh
+zft: sbx tsx qfx qlt
+xvk: kch tcp nqp vxk
+zxq: mbb dcm
+zlq: knl hpt qhv fpn
+nsm: vpp
+sgq: hgg hcs kdq pjb jjt
+tvc: flm
+nlk: vtl fjn khh
+lmb: fzh ghz dtb vqx
+mtq: llz bqz
+qbf: qnk ztv gvl
+mgg: qqb vbv
+fsm: jtm
+bcm: lnp fcc
+ldp: hcg
+gsk: lcg dkt
+jbf: vgp lvk
+qcz: tbh crj qgk kmd
+xtm: cng xhv nkr cfg
+nmn: bxn bqc tmt
+frj: gnt jkq cpx jpl
+qkk: bjb bpl hgp rvr
+grk: zfs qxh
+lzl: jdh
+czl: tjq vcg bcn jhs gzq
+qcn: jpk pcn bmj
+rnb: tdk thk
+xjl: xrd lkm kgm psr
+nqb: zhn
+slg: ttv bqj prs
+vfx: ptn
+bsv: bcp prs dbr smc ksb
+rpf: mcb hfd
+sbk: mrv
+hfp: ccn rfp qjg
+rlk: cfg
+pqh: mhr dln ltt
+pxz: cfg mhb
+kdz: tqs shr
+zzj: qlx zvl jjz nmt
+ddv: vgd dbt
+lqn: sdz kzk tmz vsr
+bkc: jrm nbx rjx
+hnn: jhx
+hxs: sfp flz tch
+jjn: skm bts vcg kvf
+tkm: pcz rmc nfb bhc
+fbx: qlz rnx hch
+jdg: kzd cmd ggp
+ghz: ndx
+fhk: jzc bhk kdc vch mdm
+szc: cbh
+bhg: mnp
+jlg: cfx lzz dxt fnv
+gzj: dbn
+hfb: bcb dhn
+frh: nlv tpp qjn jst
+jxz: cbm bbm qpz xhv vml
+jgn: pxp kjj sqv ztj
+fdm: tbc nfh gnn
+vfk: hhr zzv nxz htl
+hlm: ghk
+vpj: gbh
+nfd: qfx vhp hrb tlt htq
+ktp: jgm
+ngb: gdd xxb jzl
+bhc: tkv lcv vml
+qpv: ccs cxb
+bbc: xpn
+dnk: djg vpp
+knl: lrr bcp qmn hsd
+bgj: ltm kcj dzj tjp cxk mbz hkk
+plg: mlj txk
+tbg: nxj qmb
+dcc: snb grk jml
+jkq: vfb cxd trr ctx
+dcg: jzl hzm
+bmn: zxc vsl
+dvd: ghk xrt dkt
+ttg: vgq
+rmx: rvd zjd jkp jdg
+ccs: vbv
+tqp: vsv mqj tdz cbm qnf
+dlh: ktp
+rqc: jkd hgg
+bkd: vmz kfh gzj
+ssf: tjz dtl smp
+ttr: kpc qmz
+kmg: ljp npx
+xrp: zhd
+kdq: xch xzt fzh
+qgk: pht jjz ckf
+rnd: czh
+fnt: zdb cgb fjx
+tpf: bxk
+ztj: ccs ssc
+czq: cgn dcg rlt kgx
+tld: ctf
+qnr: tqk ckf
+nsr: vgp mdd
+tzr: shr
+ksq: qzk nfb
+rdq: qhv vbx
+xnc: mdm djx lcg kcz
+mnr: ktx
+kqq: tgn kjj dpz qbk
+rll: pxx
+nzx: ncf tdv mfc hmr
+ctl: mmk zxc qmr
+frs: zqx
+jxl: nlv
+dhz: vps bmj tsx mbc
+bqj: tvx svf
+tbc: fll
+trl: srg vcz pdt nlz
+bcp: bjz
+jkd: bxx
+dmj: xpr bbm xkv
+qhf: nlv nfx gvt thl
+zsn: hch llz gvl
+zmg: bvg zsp nfd jvx
+njt: nsm kkl
+tkv: zrd zmz ldp
+zzs: vzc pps lln dmg
+rts: dtk kgz
+glx: dhd tms hjz vgc
+hkz: cmk hnp hxt
+tcl: gbh
+skh: ccb ctf qvg
+cds: ncf
+vdj: cds mnq sgm fcc
+plm: trh fkr
+qkb: vnl jst
+jlk: zbx zrd tbc gvd
+xnz: blq rgr tvx qkg
+jvv: zmb hfb brh djt
+vxj: jst
+phf: spr vlh blp png
+mqt: stc
+hpn: qck vjx gfs bqj
+prt: bcn rsp tkv kpj
+qbs: dbp xrp gvd
+fpt: kxb
+bnt: ghz dzl bjr rxn zmf
+fmn: bqz clk dbg
+fnk: dqz hxj
+qmq: nqd bmn gbg kvz
+rkm: fll qbx cgz
+lpk: xqv xkv qrt ccv bsc bnb
+sdb: kct jzb
+chq: dnk cqh rbc
+dkt: kch ghc btt
+lhv: qpn
+mhr: nqd
+qmn: hlm dqq dxr
+phb: brx pxz mnr ndp
+vcz: lkm
+rgq: hgp xtp tzf sbk
+blq: kjj ght lvk
+njv: jsn
+tfk: lch ckn zvt
+lxf: mtq vrs qvg mvx vtm
+lth: mfs vmz
+djk: zbh lxt rfq bkp
+jll: dqz gdc vlt bgm
+xdx: vsd mrv vcg pjv
+mpm: bsk
+lbv: gbj qpv dxt vlt
+mvj: tqs zvl
+shd: jhr
+zrd: czh rpr tbq
+fpk: hcs nvr gnt fkr
+zvj: gjc lcr dbr
+stt: ghk rqh jkq nlb
+rsp: sgj ctf xvj
+cqh: vqh dnz xgl gds
+xtp: vcg
+hsz: bjf xvv vcz srm klr
+hsp: hmh tmt tfk
+lxp: njk qms bjz srb
+fpd: bhz tmz kss
+tgs: vsv gxx rfp xsj rxt
+ntb: xvm pqx
+gzq: bbc cbh
+ssk: crh cjp gbh bsr dlr
+hqh: jtv
+sqz: pcl rsr scf zmz qjn hmv
+dmd: pfp kzb gdv
+qrt: xrp frs htm jzg
+hph: qnr jdg
+lrn: str vzc zvk
+tmr: kgz dxt hph ztg
+qfg: cfx cmq fmb qxh jlm gfg
+rxt: brz nfx lzk
+lpr: blp jdh
+lzk: vps bxm
+zth: ssc qpn hsn tjp
+mbz: fnl cnt
+nht: lmk xvv hjz ttr
+vqm: bll nfl kjh ggc
+nng: mqz ktb ktn hxf zmb
+ftc: xpn qfd
+mtm: rvr vtp lpn zhb zrc
+svp: dvn mgg jjz
+dpr: vnl
+klj: cgx ztl jrm
+gsv: tld gvq qdv tlt rzd
+rvs: ccb
+kdh: gsm
+njk: lzl fxj qfm jtv
+xgb: qns phc zxq zct
+slz: tgn mmk nmf rdz mnp
+nkr: pgk
+zxp: pht
+xvv: xdg hfh
+qnf: kzk
+trh: cxd vdd
+rbk: vnl
+fmb: rvd
+xxb: pxd
+kjh: htl dpr
+qzm: rtv zxq
+gmd: zzv spk mqv pfp qts
+mtd: dcd xpx fsn
+tnv: mdm
+grs: clk
+bvm: jgm sbx qkt
+vlt: vgj pnh
+krg: kkl hpq nfb pzd dzh qpb
+mvx: lth
+qsk: vtm
+bbx: njv mfs gvd tbq
+hhk: pzz qnr
+snv: dbv tdz gdv zhc
+qfj: jsn sfz qtv jsh
+tzq: gsk zfs
+psc: vzt xrj htc rxf
+vkf: thl qbv fgq vpd
+hbb: qpz cng
+ljq: mtz mlz vxn
+lcg: tbh ggp
+pfs: nqd nvr
+zsz: zhd bhv
+cjs: bhq
+xsl: gbg
+bvr: jml qpt mpm
+xcq: hdn pqd lxk xbc rsk
+gvt: gpr
+jhs: nqb
+qzr: qpt
+qfd: spn tdk
+tmc: nqx bbc
+dbp: cbx
+ndz: gtr xgm vsl lbz
+rnx: xjc gdj rlk
+cxk: gdc
+lnq: ktp spn
+mtt: gvn hcx
+jqn: fzq xfl hnh
+pqs: xtq xbv kct
+jkb: rbk spb
+zct: szc
+znx: llz tgc lpq khj
+spr: bgm
+pqd: dtn gtr
+qfx: bxz
+gfg: zvk
+bxj: gbj vsl xrt xrd
+tpp: mqv
+ngc: gqr lmr vts mqz
+xzk: pgt tqp spb mqv
+plt: trr lzl vjh pht
+kpc: hzm bhq
+slb: brd mvs
+jbp: qms mjc
+mgm: chq gnz clb
+htc: rrp rxf
+fps: khc
+ndp: zrc htm
+zsp: vtm hdm
+xml: flb hnn rpf shx
+msb: lmk
+qns: vpj rfj ggc
+qts: smb dhn pnx bxn
+lcp: vpp vtl ztv nhl
+vhx: pqx pxz vps
+zgv: rns cls jpv gpc
+qhm: hcg
+jcd: pbl
+dtl: zhn dkj
+tzf: gxq
+vgc: lkm mbk vcv
+qvk: pxd bxx rqc
+hpt: fpp
+lkm: vmk
+zdb: kgz
+dgh: xsj xgz
+csj: dbm shx
+ddz: vmj cqs lzd
+bbz: vhz gcf dmd xzk
+sbh: qqb
+kxx: pqd lzm xfl fnk
+xmr: gfb ktz xmm xrp
+ltt: nsd mpm tzr
+hbm: szz bjb
+qrs: xgz hfc bkc
+rlt: cxk vlh
+bzb: tgv ckl ktr
+btp: snb znt vbv mcm
+qpc: nnj kjh pfh nhp
+fht: qlz thk zsn zhn mdv tdz
+rkh: gcv tdz fxm
+cmk: clx pps stn
+jml: lhc nlb
+pdg: phc hvx qdc lnq txs
+vtl: zrc
+qrm: pxd
+ctx: kdh
+nhp: vrs tzj
+dlx: kgg
+knb: gnk kcf tzf tzt htm
+lpd: qqr qrq xzm
+jlm: kch gbj blb
+hrb: mgr
+prk: gpz zlt clx
+ljp: cmq lbz bcx
+jtg: tvn
+tpq: rll lpg htc hfv nbp
+jcv: cgz gxq
+hkg: mtz vmz
+fjc: jpl qvq qhv nxj fpp svp hkk
+xpr: mqz czh
+qxm: thl xpk zdv gfb
+rsk: kfs gjc dqq
+vrs: ppg
+nlx: vpt
+bfh: rll pck xdh
+kvh: nmt
+xrd: ghc vcv
+qck: gdd
+vlv: ckn gzj ktb vjc lnq
+hqp: lqr
+vmz: mhq
+hfc: dlv vnl rvs
+kpg: psb ccb tzf lvf cft
+cdf: bhv mvs gzj
+gxx: hpz
+skz: zhn kgk sll hzs
+qbv: gpn dlt
+shl: blr tcn fvn
+pzt: gnt ttr vmj
+flt: sll xpk
+nmf: qqb kvh rhp
+fkk: pvd thl xrq jbl
+lvk: vgj
+dlt: jgm
+gvh: vqh
+tcg: bnb rlk pnx plg mxb
+snn: lhv bcp jcl rgd
+szx: hcs clq xsl
+jrg: cgb klr xgm
+zql: tkc ccv
+zpp: xgm gvn nlx
+lvp: gcd fps qpc sjv
+stn: ctl
+ggk: gpc hfh tbg fsm
+fhb: zmb zhb
+bpc: fxm rfj cch
+rfq: lsk phf jbf
+pzd: bxg gvg
+nlq: ddv xpk
+txj: fkr cxk hgk
+llh: vgq hbm vsd
+rrd: rmf vtb tqs trx vzt
+rfx: tmz djg gvq
+rtv: lqr ggm
+cgn: tqk
+psn: bmj grs qfd vhz
+vhr: kdh sqd vzt sfq
+vjh: xsl dqv
+lrb: vqx lnp shq
+dxr: qnl gpc
+tbk: cqs
+mtx: mvs ppg hdm
+kgz: jdh
+rqt: qdf kmg vdh fdt
+bls: bvg nqx nfl qxz
+rfn: snb bgm gqp xbv
+cgz: chx
+fcp: jqn klr
+xrn: jft mtd fnt ptk bpd
+bmj: szz
+dcd: xxk
+rxn: mnz ksb hmr
+mmx: ksx gch vxr kzk
+bxn: tzj mbc
+djq: ktz
+znf: qkt dpr
+dct: kpj kbd hrb sxm dnh
+bnh: sfq rrm kfs vdh
+vzt: gdc
+gms: csg tzr smc vjx
+bjr: npx nsr znt qmb
+gbl: mrx fnv bcg
+xvj: lms
+fvb: jlg tvj gbl prs dkp
+ngk: qhm kbf tcl
+sdk: mhj vrx smb nfb
+jxx: blq jzb kkm
+tls: bls vqg mfs tfc
+hgb: dmg qlx
+smb: lzk
+rbr: rjx gxx kzq
+ffg: jcl ptn jdj srg
+jfv: fgx rbr dbp dbg
+dsg: brh
+djn: mtq shx dtl
+lhc: rtj
+hvv: rnb bjb zgb cbl
+vxq: tkc
+dlr: zqx ktp
+hbg: pnd crj qgk bfq fcc
+kss: rbd
+rzt: mdd qvq
+kqz: vtz fmn mnr bkz
+rfp: rnd tlt
+pnx: tgv vhp jpk
+mcm: srp rsk ptn
+rqr: txs xdx fdm lpn
+zrj: zjm bcb
+ktx: nxz
+xzb: shn rlt jtv lxq
+nkn: dhm ppp hqp nfb bcb
+knp: kfh njv stc nkn knq
+gnk: dlt sqf
+qbn: gqb dqv krm kkm znt crn
+dtt: zjk sqv frr lxk zbh
+vdk: fzq mrx cds qkl
+qcg: vhx dsm vgq hbt shl
+dzj: lxt lln msb
+bsc: llz psb
+qjt: gvh bsb
+dbm: bqc
+htm: fvn rlk
+sjv: dbm ktx
+mnz: mgd hgg xzt
+xvm: rrf fqv
+mlz: rrs ftx zvt
+plp: gjc llg zjd xqt mdd hxj
+tdv: ztn zxv flz
+lqr: ppg ckl
+ljt: jhr lqr lsb qdc
+pqb: rrp
+kdc: str
+xcm: gph tcn rrs plg
+ftb: jhx
+ktc: czq zmk xkm tpq jkd pql
+pfr: rbx nxj plm
+rgb: jtv xxx
+blp: lzx jxx mnp
+qbk: zhg dmh
+ctt: xjr xlq
+tkt: xgm qmr
+vhp: flt hvx kbd
+kbd: qbg
+xzm: nlx vpt
+hxt: vcc stn nrf
+pzx: vpq prd qfj npp ctt
+gpr: tmz
+fxt: nps ccn mkp ntb qzm pbl
+gfs: mdm
+pdk: lvf hhr jbl bll
+nlz: dmg
+txk: xjc
+kgg: vml
+sjg: qrm pxx jtd
+gsm: nlb
+jtk: rzt lhv hcx lln
+frr: rtn hgk
+bkp: lhc psr fsm
+bfr: hqh zjn srg rts
+hbk: dbt
+sxh: zbh mdm
+jzd: tgv
+mfc: ttr qck
+qdf: cgb kkm
+vgz: mtq plg tzj
+llg: ztn qjj
+nhl: tcl jcd nrx
+stl: dkj
+hdp: tbk nqd
+fsd: hkz fzq jln stn
+stc: qhm
+kkn: bsb zrj sxm tlt szc
+nhb: dkp str bjz csk
+grj: nbx fnc
+dts: bck szc hzs
+ksx: qvg zzv
+qqb: kzd grk
+qpl: mhs lcg lkp xfc
+ftj: ssc fzh tnk
+zmk: sfp btt
+vkx: ntx psr xpx
+gpz: vxj bdn
+rdz: nbp fpp
+zgf: tgd cjb fbn mrx
+xsj: vtp
+jbs: lhc pqb lgq zxp
+rpr: lzk
+vfb: vsb qlx
+lsf: vrm zzf mcp
+ldz: bqz fmn rkh
+bhk: mbk lhv pck cgb
+mdv: dbv gjm
+bkk: mvj kfs vsl xrj
+ftx: grj bdn
+gtr: pzz rbx knd xch
+xhc: dlx zfl
+txz: ggm ctf lvf cpm
+bcx: qxc bqv
+vkn: qpt rvd
+qjg: fps clk fnc
+qlx: frr
+tqb: shd bqs bxk vtz mqq
+mfp: svf rlb
+xgl: ldp mhj
+smp: vtp
+gds: mtz
+ndx: xrj
+hsg: jbp lxq npm xgm
+pvs: mnl vrm
+cpx: cqs
+ldf: qkb mgz
+tlc: rll tml cgn
+bdd: pvs dtl prd cnr
+khd: gvl rpr dbm mhq
+jts: tbk pjb qqr
+hpm: sbh
+ptk: ncf
+kgx: str
+hnp: kgm
+zmx: kmg lgq pfs qkv
+qvc: zjk nht jzc
+sdp: ktz
+hhr: hxd
+vtb: ghk str zlt
+vmh: dpl sps fdt lns jph lcr dln
+gcd: khc rvs cbx
+xbc: ndx hpm dcd
+bxc: vpt sqv fmb gfs
+mnp: hfv
+gtc: ssc cxb bxx
+fgb: gpn flb hbm cdf
+lzz: lpd
+lsb: tjz rmc ktz
+crh: vxj mqt qbv cgx xqv
+rrm: lmk
+sqd: smc
+tzd: nkr cdf mvx shl
+dzg: cgz qjt hpd
+tqq: jqn npm cgb
+mrp: rcm qrs zzf dcm
+hvx: dlr nrx
+cnq: qsn cxd
+ffl: hpv jmr cng
+gdv: jgm
+jvx: qbf qzm nfx
+vmj: pnh
+flb: zbx rvs
+qbx: kzb qbv
+sff: ndp mkd
+lxt: pps grk
+xmm: brx rnn
+bjh: vch djx gqb
+rtc: mrh slj kbh qbv
+gxq: ktz
+ztf: tbb hfv gdc vbr
+szr: ggt nfx
+xlb: vjh xrt qcz zmf
+vcn: hcf nsm tls tqp
+jlf: vdh kgm krm kgx
+nfh: hch
+khp: fpt fnj kvh hhf jtd pqs lzd jtm
+ncp: hmh zbx ctt cbm mls
+xsh: lxg ktx vqg shx njv
+fsn: rdq tzq hjz
+gsl: mgm gvd qmh clt mlj
+rgs: tnv hlm fnk
+rpm: lsr tml
+dxh: rzd crh lqr
+qsn: nlb
+ltc: bnb nxz xmm pcl
+rns: xch ppn
+bmb: gdj brh
+dnh: mls mqj
+xqt: jtg rpm pzz
+hmr: fjx rtn
+zgb: bxk xlq msr
+cvt: qzr nmt fqm
+qlh: ncf hlm vcc hdn
+glq: mfp hnp tqs
+bcn: zsz
+dxl: rbd
+hbn: nxz
+jxr: gjm qdv
+sfq: str xdg
+pjb: trr
+rtj: nlz fkr tvj
+xkm: fbn rqc kdc
+cft: lzk gvg
+qpz: gjm gvg
+jjp: qtv bpl kjm sbx kzb
+dgd: zlt jqn vdd kdz
+rlb: llg
+skm: tsx dlh pvg
+zhg: qmn lsr qdv
+mqm: hvx sbf kkn qsk
+hzf: rnb tsx
+xrc: qrq mfp hgb vfc hkp
+zgj: tdv pck zvk pqh hpm
+vqx: qjr vsb jpl
+hbp: mgz qrt fbx
+pqq: sdp vpj
+hhq: bjf vpv
+vfz: txk jkb mcs thl kss
+qdd: xkv khc nqx
+pgq: gqb hnh fbn vmk
+bcg: ccs
+fvd: dlx hsp gph jzg jqb
+gcv: gvp
+cnr: gfb dxh gxq qbx
+hbt: hch dbv pcl
+gqr: cch qnf nrx
+jcb: ksb jpl pck
+pfb: hsv jhs pqq kbf
+kmr: gvh mtp sxg
+jmr: bjb
+jzn: bhv gxx dbn djg
+pnj: vbv vdh xgh lzl
+qlr: dbt qbs lcv bbc
+zjk: jph
+tch: prs vbx rrm lzx
+xpx: dbr jnm
+mhs: jkp dhf ngb mfc
+clq: rrp
+ssd: nmn xlq ljq nrx
+gps: dxl pgk bjb gpr
+mlp: mnl hpq tdk rtv
+pzz: jtm
+pnr: vxj dnh rbc
+sqf: tmt czh
+xpb: tqq cxb lft pht
+zxf: pfr jjz mrb vfb
+gsq: rbx kkm
+vjt: hcg brd xhv
+tgc: shx nxh
+pjl: fpv grj bvm sll nfd
+kxj: ttg dpr dlx clb cbm
+scf: szz vtp
+vjc: zjm nbx
+blb: hxj dxr vgj
+ppn: kxb ntx dxr bmn
+pvd: mtx qfx lch
+qnk: vml
+pnd: tnv lrb jcl
+pht: hfv
+tzt: nxh dlv xlq
+hpx: jtd vxk bgm dqv dtz
+bnb: vpp tkc
+qxz: jdl gvh dbn
+sdz: xvp jsq dgh
+vcj: knd ptk
+dbl: ggc cjp bzb dpr
+ztl: tjz vjg spn
+nfl: skh tpf
+pcl: gvp
+zrs: gsm kct
+hmv: grj gkk
+xgf: vgd
+gcf: djn slj ftx
+lkd: htl xvj ktp qjg hnn
+dhm: dnz cbx
+jtm: rxf
+jmk: mbk slg prk smc
+xkr: ckn khh xgf gds
+rdg: hsp xcl hbp
+rnn: jcv lxc jcd
+qss: nfh kfh
+llz: tld
+kjm: djq
+tdd: pvq crh bsc
+kdp: hgb fsm zmr nbp
+brz: hbk hmt mhq
+djz: vsv slb
+npx: ztn
+zzq: hpd ktr ptl xhs
+kbf: vxn
+sxm: ktx slb
+vgr: xtp dnz hqp tvc
+lnp: qmb jdh
+lvf: zfq
+dhd: plm jkd cqs
+spk: mgr vrh nlq ngk
+nxd: txs mlj frs qdd kgk
+nnr: vcz cpx hsn rlb
+sfz: bhv mkd
+jph: hlm jtd
+ttv: zpp xsl hhf tgd
+zbk: xpx ctx qzr mct zzj
+dcm: pqq hcq
+dtn: zqg qsn qxp mtt
+jsh: tkc mrh
+pxc: lmk zjn kvz msb vsb
+fnl: rgr hqh
+ltm: cmd vdd hph
+mls: dbn dxl gvq
+tjp: krm
+hbl: vjc sdz tmc scf
+dpl: jtm bjh nlb nlz
+msr: mcp mtp
+brb: hxs kjj fnt cgg
+fbn: kzd
+zmr: vfc ksb kcz
+tdz: jhr rcm
+rmc: khh mbc
+trc: mhq szz
+clt: hbb qkt
+qnl: pjb tbb
+hzd: kpc dbr qrm
+fnd: sbh lpg vxk ddz
+nlv: hcq
+fgg: kpc
+lhr: ktb bpl jcv
+mbb: dhn
+hnj: xmc jbl ljb ldf rpc
+gjh: vrx xqv
+bjb: sll
+gnz: flm
+zqg: shr vcj jtm npx
+zqs: sgt xzm hpt pjc
+xcg: msr dgh fth xvp
+tnk: pdt mhr
+mnq: dvn qmr bfq
+jxh: szr vhx qtv gph
+qvg: jgm
+hpz: dlv tjz brd
+zvr: tcn trc dkj nqx
+prd: fgx gpn
+dln: pxx zxp
+tcp: hgk nqp jzb
+gvd: rcm
+xxx: ght zxv
+dxt: sdb
+xqv: plg
+hpd: bqs cch
+rqh: cmq cls rmf
+tbq: grs
+rgf: hfd qcn bbm csj bqz
+zjd: dmh vfc sgt
+dpz: pzt bcm qpn
+lch: flm
+hlt: gnt hsn dvd zcv qbn
+bgb: vbt jtm krm ndx
+bjz: pdt
+mjc: zfs
+srm: lvk bsk sqd
+bhx: ffr qnk jxz qdv
+kmd: qkv
+bts: clb kvf
+brx: hcq fgx
+dxj: dnz gdv xjc
+mvs: vjg
+fnj: lqc pxx jbf jzc
+bpr: hfp zfq jzg ldp vqh
+flm: ztv nqx
+hmz: hzn qbk ffg
+vhz: hgp pgk
+qjn: hpq
+ptl: plg xgz dbv
+ntx: tkt
+hdm: qdv fxm
+kbh: szz xtm vrm
+shn: ctx sfh lft
+gqp: hqh zst gsq
+kpf: tzr hzd dqz pqb bcg
+crb: qvq lhv npx jzc
+pcz: bkz czh
+nhc: jxr
+bdn: qbg
+dpk: zdb jlt lkm rdq qfm
+qmh: vtm csj nps
+phc: bxn fpv
+nhr: fpd jrm grj pnr vpq
+lzs: cch gnz fth jxr hlv
+qjh: bmn jtv clx jlg
+dnv: jbp bxx spr ftj tlc tjp
+jdl: bmb szt qnk sfz
+fmj: vkx tnk rdz cjs
+qvq: lgq
+pjp: gsq tkt fzq
+cvd: rlb kdp qck zvk
+bxp: dvn hmz gfs lpr mbz
+hxd: mbc
+mct: lxq nsd
+zvt: zql bqc
+mlx: tjz bsl rpc pvs
+gzf: htl vfk rpf nhc dmj
+jlr: ctl svf tvj bjf
+bsk: tvx
+hkp: cgn bfh vlh qnr
+btt: bhg zfs
+hqr: rts hnp nsd ghz
+vvq: mnr bck xpr
+qzk: stc bdn clk
+hfs: knd gbg tbg dcd msb mrb
+cgx: fgx gvt
+slj: flt stl
+lzx: kmd
+hcq: dkj
+fjx: qrq
+vsd: vgd qsk
+vbt: xdg
+fnc: dbt bxm
+djt: gds
+qgx: bxg mtp xvm zfq vlv
+lpg: dqq qpt
+zdv: ckl zjm
+hxf: ksx hzf
+zfl: qfd qbg
+tfc: qdd nfb
+jzl: jkp
+fxd: hxd xsj
+sfh: fxj
+cpm: hhr zrc djq rbc
+vgp: lrn
+qkl: stn gvn
+mrb: bgm dmg
+vzp: tvc lcv qtv jmr
+gph: fqv smp
+hgk: pck
+tsz: hfd jsn mrz hbn bpr bsb
+blr: tmz
+zpk: zzf zxq dxj fth
+vvt: znt gsk vbr
+hmk: jgb hfb mnl mlj
+fdt: gdd txj sjg
+hcs: jtg
+htq: sdp gvq pnr
+zvl: ghc fgg
+zmz: sxg
+vfl: rkm znf gcv mjh jxr
+lmg: nsr rmf jft xtc cfx
+gnn: tmc cbl
+mcs: hmt hpq tfc
+tms: cnq pql
+vrh: tdd bls bmz
+kvf: xpk
+vgj: hdp bgm
+qpb: nqb bqs lch
+pcn: plg cng
+tbh: tnv nmt
+bvg: xrp jcd mhb
+kvs: cgg gjc cmd xjl
+qtz: mvx hmt lzs ksx frs
+mqb: jnm mpm
+jft: qqp gpc
+mzt: vxk tqk trx ltt
+ghn: xhv mtx ksx mqt
+mmk: srp lzm
+ktb: rjx tcl jsn
+vjg: mgr
+pdc: vsb blb bfq
+znh: szr ksq vjc
+fpj: mct hzm tlc gsm
+hcx: vch cmd vpv
+mqq: sxg qbg
+rgd: kcz sxh ghk rns
+bsr: zvt xjr dsg
+nbx: kzk mhb
+kzx: plm fxj
+nrf: zxv fbn pxd
+krj: tcp lzz hpt gpv
+bzk: cxd qmb sgt zxp kzx jlm
+ggc: rbd
+kmv: csk snb bvr dtk
+lbl: vnl gjm ppg ccb
+kjv: hfb brx bxk
+fsf: rrp lmk ssc
+sbf: pgt vps vxj
+lmr: rnn ttg fhb jkz dbt
+hzn: gvn
+hqk: vrn ffl jhs djz
+bfb: vtm zsz ftb knq hpd
+hkk: rvd jcl
+kgc: mvs fmm cbx ftx
+gbh: jhr
+cpv: hxj hdp rgs pfs
+kvz: fzh vcc
+sjz: vpt ptn zjk kvj
+rrs: khc jxl
+vdr: lcv ldf hfc nlk bqc
+xxc: hfh qmz vpt tbk
+bgm: kmd
+gkk: kbd bxm ggt pvq
+csg: hhf lzm
+vrn: nhc bpl
+dzt: djt kjm bkd vxq
+zhc: zct rcm smp gcd
+pvq: bcb ccv
+hjt: dbg dzg sgj gdj
+vtz: clk
+jjt: nxj bcg lrn
+ggm: ftb
+srg: pnh zlt kdc
+ccn: hfd hbn
+tml: kkm
+rtn: srp
+mzf: spr fnl qms mrx
+rhp: pxd fpt
+hdn: pxx zrs
+qqp: nsd
+xdh: prs qrq cmq vmj
+mnn: zpd jts pgq jlt gfg
+mjh: hbm ckn vnl
+xrj: kcz qrm
+sgj: mhb hbb
+gdd: tvn
+bxz: mrv dlt
+kvl: jgm gjh lcp vgz
+nnz: bxc mgd txj
+qkg: fnl kgx qqr ncb
+pps: srp vbx qck qjr xxb
+zhb: mgr tpf
+lpq: zfq rnd qss
+jnm: vpt
+pzv: prk khn lzr jkp
+tcj: hvb fjx nvr clq
+pvg: bxz gvg fgq
+zcv: lrr kjj lzd
+psr: sps ltt
+bsl: dzn njt frb
+nvv: jdl vml qjn djn
+jrp: tqs flz szg qmz
+djx: trr dkp
+rtz: bqz lqr zbx hxf
+mgd: tbb
+hsn: vcc
+hlv: zzv vrs
+dsm: dbg ddv qhf
+vdd: tnv
+rfj: mhb
+qjj: nvr nbp tvn
+lln: pxx
+nqp: nmt
+mhj: dbn
+cbk: dkj tjq bnl gbv
+pgd: bcx vfx rzt cds vvt
+xmc: zxq rbk xjc
+fpn: knd dqz lns vbt
+bcj: fvn ztv
+dzn: txk qss qnf
+xrq: dvk szr kbf dnt
+lsr: hzn pht
+chx: rbd gnk szc
+pjr: qfm lpr sgt ght
+qmr: qfm
+rzd: llz vcg
+ttn: xhc brd zmz gpr dlv spn rdg
+gbv: qpz gpz
+szt: lqr gch vxq
+xvp: rrf cbl kgg
+lms: ckl
+rpj: zfl kfh ggt qtj
+xhs: zrj bmb lms
+lsk: zrd jxl bcn rbr dvm vvq
+xfl: lns
+bpd: xxk rgr
+hlg: sqv qqp kdq
+vqh: gdj
+hqs: nhp fxd ldz nlq rmc ssf
+hpv: gvd rpc
+lqz: tzj bsr tld kkl rrf
+btk: csg jrg mdd qmr
+bvd: zhd llh ftb ztl jxl dmj
+dzl: kch zxc cxd
+vcv: bqv
+lcl: qxc lxq nnz lkp
+dbv: jhx
+xcx: dkj mtp
+vjr: rfx vpp sxg mpv
+kvj: zqg fnd vfx bhg
+ggt: mdv
+qtj: brx gvh
+fxv: pxp sps dcc vdd
+jzc: tqs
+fqm: mct ncb zvl
+mxb: bxm rbc clk
+xcl: fll hxd fvn
+xgh: zxv qms mvj
+zlm: qxh vcv qjr qkv sxh
+trx: xgm nmt
+xmb: kmr xcx dsg gjh
+jmn: jsh xhc xgl
+frb: bxk rpc jmr
+mqj: trc
+lxk: kxb mqb
+crn: jzb jtg hhf gqp
+nnq: svf
+bmz: dbp tvc qns
+gvp: vtl
+cjb: zdb zbh hgg
+bhz: pgk hcf ntb
+hzj: lhq rfj jhx hfd xjr
+lbz: nbp
+jpk: bsb dhn
+nfn: qfx hmh gnz qjt
+vrx: nfl fps
+khn: nnq fsf vcj
+qxp: ztj kvz rxf
+zpd: xfl gtc
+dmh: lbz mgg
+cbh: lcv
+qlt: jzd qtj jzg
+hxj: ztn lbz
+vxn: nrx
+cls: zrs
+mcb: ccv nxh tdk
+bld: vjg hpv vmz nfb
+ggp: cjs qsn clq vmk jtm
+shx: mqj
+pqx: xgf
+bpn: vgp xvv pqb qzr
+skq: xrd lhv rzt
+hnh: klr jzl
+dkp: bhq
+jkz: djg sbx
+kzb: mls
+zqx: pfp cbh jhx
+kkl: stl gvt
+jsq: skm vrx ffl
+csk: qnl gtr
+xtq: hhq qkl pxp
+dvk: sff pgk grj
+jgb: hgp gvp nfh
+npm: hhk xzt
+lxg: mrh jmr dxl
+vsr: hcg mhj blr
+ppp: dnt pcn hdm bsl
+ktn: vnl jzd fnc
+mrz: kjm tpp
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diff --git a/day25/uppga.c b/day25/uppga.c
@@ -0,0 +1,94 @@
+#include "common.h"
+
+#define ASIZE 26
+
+static inline size_t idx(char *s) {
+  size_t a = (size_t)(s[0] - 'a');
+  size_t b = (size_t)(s[1] - 'a');
+  size_t c = (size_t)(s[2] - 'a');
+
+  return (a * ASIZE * ASIZE) + (b * ASIZE) + c;
+}
+
+static void graph_setup(graph_t *g, char **lines, size_t nlines) {
+  char *cp;
+  size_t c = 0;
+  size_t i;
+  size_t dict[ASIZE * ASIZE * ASIZE];
+  for (i = 0; i < ASIZE * ASIZE * ASIZE; i++)
+    dict[i] = SIZE_MAX;
+
+  for (i = 0; i < nlines; i++) {
+    cp = lines[i];
+    while (*cp != '\0' && *cp != '\n') {
+      if ('a' <= *cp && *cp <= 'z') {
+        if (dict[idx(cp)] == UINT64_MAX) {
+          dict[idx(cp)] = c;
+          c++;
+        }
+        cp += 3;
+      } else {
+        cp++;
+      }
+    }
+  }
+
+  graph_init(g, c);
+
+  size_t cnode;
+  for (i = 0; i < nlines; i++) {
+    cp = lines[i];
+    cnode = idx(cp);
+    cp += 4;
+    while (*cp != '\0' && *cp != '\n') {
+      if ('a' <= *cp && *cp <= 'z') {
+        graph_add_edge(g, dict[cnode], dict[idx(cp)]);
+        cp += 3;
+      } else {
+        cp++;
+      }
+    }
+  }
+}
+
+static uint64_t partition_wrapper(graph_t *g) {
+  size_t i, j;
+  igraph_t h;
+  igraph_vector_int_t partition, partition2, cut;
+  igraph_real_t value;
+
+  igraph_empty(&h, g->n, IGRAPH_UNDIRECTED);
+
+  for (i = 0; i < g->n; i++) {
+    for (j = 0; j < (g->nbrs[i]).nmemb; j++) {
+      igraph_add_edge(&h, i, (g->nbrs[i]).data[j]);
+    }
+  }
+
+  igraph_vector_int_init(&partition, 0);
+  igraph_vector_int_init(&partition2, 0);
+  igraph_vector_int_init(&cut, 0);
+
+  igraph_mincut(&h, &value, &partition, &partition2, &cut, NULL);
+
+  size_t p1s = igraph_vector_int_size(&partition);
+  size_t p2s = igraph_vector_int_size(&partition2);
+
+  igraph_vector_int_destroy(&cut);
+  igraph_vector_int_destroy(&partition2);
+  igraph_vector_int_destroy(&partition);
+  igraph_destroy(&h);
+
+  return p1s * p2s;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  graph_t g;
+  graph_setup(&g, lines, nlines);
+
+  uint64_t prod = partition_wrapper(&g);
+  printf("%llu\n", prod);
+}
diff --git a/day3/Makefile b/day3/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day3/common.c b/day3/common.c
@@ -0,0 +1,59 @@
+#include "common.h"
+
+void nbrs(coordinate_t *res, const size_t i, const size_t j, const size_t nrows,
+          const size_t ncols) {
+  size_t idx = 0;
+  if (i > 0) {
+    if (j > 0) {
+      res[idx].y = i - 1;
+      res[idx].x = j - 1;
+      idx++;
+    }
+
+    res[idx].y = i - 1;
+    res[idx].x = j;
+    idx++;
+
+    if (j < ncols - 1) {
+      res[idx].y = i - 1;
+      res[idx].x = j + 1;
+      idx++;
+    }
+  }
+
+  if (j > 0) {
+    if (i < nrows - 1) {
+      res[idx].y = i + 1;
+      res[idx].x = j - 1;
+      idx++;
+    }
+
+    res[idx].y = i;
+    res[idx].x = j - 1;
+    idx++;
+  }
+
+  if (i < nrows - 1) {
+    if (j < ncols - 1) {
+      res[idx].y = i + 1;
+      res[idx].x = j + 1;
+      idx++;
+    }
+
+    res[idx].y = i + 1;
+    res[idx].x = j;
+    idx++;
+  }
+
+  if (j < ncols - 1) {
+    res[idx].y = i;
+    res[idx].x = j + 1;
+    idx++;
+  }
+
+  while (idx < 9) {
+    res[idx].x = SIZE_MAX;
+    res[idx].y = SIZE_MAX;
+    idx++;
+  }
+}
diff --git a/day3/common.h b/day3/common.h
@@ -0,0 +1,20 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <reading.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+typedef struct {
+  size_t x;
+  size_t y;
+} coordinate_t;
+
+#define is_defined(c) (c.x != SIZE_MAX)
+
+void nbrs(coordinate_t *res, const size_t i, const size_t j, const size_t nrows,
+          const size_t ncols);
+
+#endif
diff --git a/day3/exinput b/day3/exinput
@@ -0,0 +1,10 @@
+467..114..
+...*......
+..35..633.
+......#...
+617*......
+.....+.58.
+..592.....
+......755.
+...$.*....
+.664.598..
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diff --git a/day3/uppga.c b/day3/uppga.c
@@ -0,0 +1,54 @@
+#include "common.h"
+
+static inline int is_digit(char x) { return '0' <= x && x <= '9'; }
+
+static inline int is_symbol(char x) { return x != '.' && !is_digit(x); }
+
+static int has_adjacent_symbol(char **lines, const size_t i, const size_t j,
+                               const size_t nrows, const size_t ncols) {
+  coordinate_t n[9];
+  nbrs(n, i, j, nrows, ncols);
+
+  size_t nbr_i = 0;
+  while (is_defined(n[nbr_i])) {
+    if (is_symbol(lines[n[nbr_i].y][n[nbr_i].x]))
+      return 1;
+    nbr_i++;
+  }
+
+  return 0;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+  size_t cols = strlen(lines[0]) - 1;
+
+  uint64_t sum = 0;
+  size_t i, j;
+  int in_number = 0;
+  uint64_t cnum = 0;
+  int symbolic = 0;
+  for (i = 0; i < nlines; i++) {
+    for (j = 0; j < cols; j++) {
+      if (is_digit(lines[i][j])) {
+        in_number = 1;
+        if (has_adjacent_symbol(lines, i, j, nlines, cols)) {
+          symbolic = 1;
+        }
+        cnum = cnum * 10 + ((int)(lines[i][j] - '0'));
+      } else {
+        if (in_number) {
+          if (symbolic) {
+            sum += cnum;
+          }
+          in_number = 0;
+          cnum = 0;
+          symbolic = 0;
+        }
+      }
+    }
+  }
+
+  printf("%llu\n", sum);
+}
diff --git a/day3/uppgb.c b/day3/uppgb.c
@@ -0,0 +1,104 @@
+#include "common.h"
+
+typedef struct {
+  size_t identifier;
+  uint64_t value;
+} adj_t;
+
+static inline int is_digit(char x) { return '0' <= x && x <= '9'; }
+
+static inline int update_adjacents(adj_t *adjs, const adj_t x) {
+  if (x.identifier) {
+    if (adjs[0].identifier == 0) {
+      adjs[0] = x;
+    } else if (adjs[0].identifier != x.identifier) {
+      if (adjs[1].identifier != 0) {
+        if (adjs[1].identifier != x.identifier) {
+          return 0; // more than 2
+        }
+      } else {
+        adjs[1] = x;
+      }
+    }
+  }
+
+  return 1;
+}
+
+static uint64_t gear_ratio(char **lines, const size_t i, const size_t j,
+                           const size_t nrows, const size_t ncols,
+                           adj_t *table) {
+  if (lines[i][j] != '*')
+    return 0;
+
+  adj_t adjs[2];
+  adjs[0].identifier = 0;
+  adjs[1].identifier = 0;
+
+  coordinate_t ns[9];
+  nbrs(ns, i, j, nrows, ncols);
+
+  size_t k = 0;
+  while (is_defined(ns[k])) {
+    if (!update_adjacents(adjs, table[ns[k].y * ncols + ns[k].x]))
+      return 0;
+    k++;
+  }
+
+  if (adjs[1].identifier != 0) {
+    return adjs[0].value * adjs[1].value;
+  }
+
+  return 0;
+}
+
+static inline void make_tables(adj_t *table, char **lines, const size_t nrows,
+                               const size_t ncols) {
+  size_t count = 1;
+  uint64_t nnum = 0;
+  int innum = 0;
+  size_t i, j;
+  for (i = 0; i < nrows; i++) {
+    for (j = 0; j < ncols; j++) {
+      if (is_digit(lines[i][j])) {
+        if (nnum == 0) {
+          nnum = strtoull(&lines[i][j], NULL, 10);
+        }
+        table[i * ncols + j].value = nnum;
+        table[i * ncols + j].identifier = count;
+        innum = 1;
+      } else if (innum) {
+        count++;
+        innum = 0;
+        table[i * ncols + j].value = 0;
+        table[i * ncols + j].identifier = 0;
+        nnum = 0;
+      } else {
+        table[i * ncols + j].value = 0;
+        table[i * ncols + j].identifier = 0;
+      }
+    }
+  }
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nrows = readlines(&lines, "input");
+  size_t ncols = strlen(lines[0]) - 1;
+
+  adj_t table[nrows * ncols];
+  make_tables(table, lines, nrows, ncols);
+
+  size_t i, j;
+  uint64_t ratsum = 0;
+  for (i = 0; i < nrows; i++) {
+    for (j = 0; j < ncols; j++) {
+      uint64_t rat = gear_ratio(lines, i, j, nrows, ncols, table);
+      if (rat > 0) {
+        ratsum += rat;
+      }
+    }
+  }
+
+  printf("%llu\n", ratsum);
+}
diff --git a/day4/Makefile b/day4/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o ../utils/smallset.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day4/common.c b/day4/common.c
@@ -0,0 +1,29 @@
+#include "common.h"
+
+void parse_sets(smallset *ls, smallset *rs, char **lines, size_t nlines) {
+  size_t i;
+  char *cc;
+  uint64_t v;
+
+  for (i = 0; i < nlines; i++) {
+    cc = lines[i];
+
+    // until data
+    while (*cc != ':') {
+      cc++;
+    }
+
+    smallset_init(&ls[i], 128);
+    smallset_init(&rs[i], 128);
+
+    while ((cc = sread_next_u64(&v, cc)) != NULL) {
+      smallset_insert(&ls[i], v);
+      if (cc[1] == '|')
+        break;
+    }
+
+    while ((cc = sread_next_u64(&v, cc)) != NULL) {
+      smallset_insert(&rs[i], v);
+    }
+  }
+}
diff --git a/day4/common.h b/day4/common.h
@@ -0,0 +1,15 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <reading.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <reading.h>
+#include <smallset.h>
+
+void parse_sets(smallset *ls, smallset *rs, char **lines, size_t nlines);
+
+#endif
diff --git a/day4/exinput b/day4/exinput
@@ -0,0 +1,6 @@
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+Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11
diff --git a/day4/input b/day4/input
@@ -0,0 +1,202 @@
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diff --git a/day4/uppga.c b/day4/uppga.c
@@ -0,0 +1,34 @@
+#include "common.h"
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+  size_t i;
+  uint64_t card;
+  uint64_t sum = 0;
+
+  smallset ls[nlines], rs[nlines];
+
+  parse_sets(ls, rs, lines, nlines);
+
+  smallset in[nlines];
+
+  for (i = 0; i < nlines; i++) {
+    smallset_init(&in[i], 128);
+    smallset_intersection(&in[i], &ls[i], &rs[i]);
+
+    card = smallset_cardinality(&in[i]);
+    if (card != 0)
+      sum += (1 << (card - 1));
+  }
+
+  printf("%llu\n", sum);
+
+  for (i = 0; i < nlines; i++) {
+    smallset_clear(&in[i]);
+    smallset_clear(&ls[i]);
+    smallset_clear(&rs[i]);
+  }
+
+  return 0;
+}
diff --git a/day4/uppgb.c b/day4/uppgb.c
@@ -0,0 +1,43 @@
+#include "common.h"
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+  size_t i, j;
+  uint64_t card;
+  uint64_t sum = 0;
+  uint64_t copies[nlines];
+  smallset ls[nlines], rs[nlines], in[nlines];
+
+  parse_sets(ls, rs, lines, nlines);
+
+  for (i = 0; i < nlines; i++) {
+    copies[i] = 1;
+  }
+
+  for (i = 0; i < nlines; i++) {
+    smallset_init(&in[i], 128);
+    smallset_intersection(&in[i], &ls[i], &rs[i]);
+
+    card = smallset_cardinality(&in[i]);
+    for (j = i + 1; j <= i + card; j++) {
+      if (j >= nlines)
+        break;
+      copies[j] += copies[i];
+    }
+  }
+
+  for (i = 0; i < nlines; i++) {
+    sum += copies[i];
+  }
+
+  printf("%llu\n", sum);
+
+  for (i = 0; i < nlines; i++) {
+    smallset_clear(&in[i]);
+    smallset_clear(&ls[i]);
+    smallset_clear(&rs[i]);
+  }
+
+  return 0;
+}
diff --git a/day5/Makefile b/day5/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o ../utils/stack_u64.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day5/common.c b/day5/common.c
@@ -0,0 +1,47 @@
+#include "common.h"
+
+static inline int is_digit(char x) { return '0' <= x && x <= '9'; }
+
+size_t read_ranges(size_t *nranges, range_t *ranges, char **lines,
+                   size_t nlines) {
+  size_t i = 2; // skip to range data
+  size_t count = 0;
+  uint64_t t, s, b;
+  range_t ran;
+  char *cp;
+  nranges[count] = 0;
+
+  while (i < nlines) {
+    if (is_digit(lines[i][0])) {
+      cp = sread_next_u64(&t, lines[i]);
+      cp = sread_next_u64(&s, cp);
+      cp = sread_next_u64(&b, cp);
+
+      ran.lb = s;
+      ran.ub = s + b - 1;
+      ran.delta = (int64_t)t - (int64_t)s;
+      ranges[count * nlines + nranges[count]] = ran;
+      nranges[count]++;
+    } else if (lines[i][0] == '\n') {
+      count++;
+      nranges[count] = 0;
+    }
+
+    i++;
+  }
+
+  return count + 1;
+}
+
+stack_u64 read_starts(char **lines) {
+  char *cp = lines[0];
+  uint64_t t;
+  stack_u64 r;
+  stack_u64_init(&r);
+
+  while ((cp = sread_next_u64(&t, cp)) != NULL) {
+    stack_u64_push(&r, t);
+  }
+
+  return r;
+}
diff --git a/day5/common.h b/day5/common.h
@@ -0,0 +1,22 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <reading.h>
+#include <stack_u64.h>
+
+typedef struct {
+  uint64_t lb;
+  uint64_t ub;
+  int64_t delta;
+} range_t;
+
+size_t read_ranges(size_t *nranges, range_t *ranges, char **lines,
+                   size_t nlines);
+stack_u64 read_starts(char **lines);
+
+#endif
diff --git a/day5/exinput b/day5/exinput
@@ -0,0 +1,33 @@
+seeds: 79 14 55 13
+
+seed-to-soil map:
+50 98 2
+52 50 48
+
+soil-to-fertilizer map:
+0 15 37
+37 52 2
+39 0 15
+
+fertilizer-to-water map:
+49 53 8
+0 11 42
+42 0 7
+57 7 4
+
+water-to-light map:
+88 18 7
+18 25 70
+
+light-to-temperature map:
+45 77 23
+81 45 19
+68 64 13
+
+temperature-to-humidity map:
+0 69 1
+1 0 69
+
+humidity-to-location map:
+60 56 37
+56 93 4
diff --git a/day5/input b/day5/input
@@ -0,0 +1,236 @@
+seeds: 2880930400 17599561 549922357 200746426 1378552684 43534336 155057073 56546377 824205101 378503603 1678376802 130912435 2685513694 137778160 2492361384 188575752 3139914842 1092214826 2989476473 58874625
+
+seed-to-soil map:
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+1080275742 3972414954 42376007
+133423835 0 47360832
+3463159039 3725575163 236823978
+997645246 3161641056 82630496
+
+soil-to-fertilizer map:
+303672059 1087423328 103502353
+171922589 2907629744 91556518
+2064217168 468859004 91214014
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+
+fertilizer-to-water map:
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+
+water-to-light map:
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+
+light-to-temperature map:
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+
+temperature-to-humidity map:
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+
+humidity-to-location map:
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diff --git a/day5/uppga.c b/day5/uppga.c
@@ -0,0 +1,47 @@
+#include "common.h"
+
+static uint64_t get_value(uint64_t start, range_t *ranges, size_t *nranges,
+                          size_t np, size_t nlines) {
+  size_t i, j;
+  uint64_t cv = start;
+  range_t ran;
+
+  for (i = 0; i < np; i++) {
+    for (j = 0; j < nranges[i]; j++) {
+      ran = ranges[i * nlines + j];
+      if (ran.lb <= cv && cv <= ran.ub) {
+        cv += ran.delta;
+        break;
+      }
+    }
+  }
+
+  return cv;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  uint64_t min_value = UINT64_MAX;
+  uint64_t t;
+
+  size_t nranges[nlines];
+  range_t ranges[nlines * nlines];
+
+  uint64_t np = read_ranges(nranges, ranges, lines, nlines);
+  stack_u64 starts = read_starts(lines);
+
+  size_t i;
+  for (i = 0; i < starts.nmemb; i++) {
+    t = get_value(starts.data[i], ranges, nranges, np, nlines);
+    if (t < min_value)
+      min_value = t;
+  }
+
+  stack_u64_clear(&starts);
+
+  printf("%llu\n", min_value);
+
+  return 0;
+}
diff --git a/day5/uppgb.c b/day5/uppgb.c
@@ -0,0 +1,108 @@
+#include "common.h"
+
+static uint64_t backmap(uint64_t x, range_t *ranges, size_t *nranges, size_t i,
+                        size_t nlines) {
+  size_t j;
+  range_t ran;
+
+  for (j = 0; j < nranges[i]; j++) {
+    ran = ranges[i * nlines + j];
+
+    if (ran.lb + ran.delta <= x && x <= ran.ub + ran.delta) {
+      return x - ran.delta;
+    }
+  }
+
+  return x;
+}
+
+static uint64_t compute_value(uint64_t x, range_t *ranges, size_t *nranges,
+                              size_t nlines, size_t np) {
+  size_t i, j;
+  range_t ran;
+  uint64_t cv = x;
+
+  for (i = 0; i < np; i++) {
+    for (j = 0; j < nranges[i]; j++) {
+      ran = ranges[i * nlines + j];
+      if (ran.lb <= cv && cv <= ran.ub) {
+        cv += ran.delta;
+        break;
+      }
+    }
+  }
+
+  return cv;
+}
+
+static int is_in_ranges(uint64_t x, stack_u64 *lbs, stack_u64 *ubs) {
+  size_t i;
+
+  for (i = 0; i < lbs->nmemb; i++) {
+    if (lbs->data[i] <= x && x <= ubs->data[i])
+      return 1;
+  }
+
+  return 0;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+  size_t i, j;
+  int u;
+  uint64_t val;
+  uint64_t minval = UINT64_MAX;
+
+  size_t nranges[nlines];
+  range_t ranges[nlines * nlines];
+
+  uint64_t np = read_ranges(nranges, ranges, lines, nlines);
+
+  stack_u64 starts = read_starts(lines);
+  stack_u64 lbs, ubs;
+  stack_u64_init(&lbs);
+  stack_u64_init(&ubs);
+  for (i = 0; i < starts.nmemb; i += 2) {
+    stack_u64_push(&lbs, starts.data[i]);
+    stack_u64_push(&ubs, starts.data[i] + starts.data[i + 1] - 1);
+  }
+
+  stack_u64 lowpoints[np];
+  for (i = 0; i < np; i++) {
+    stack_u64_init(&lowpoints[i]);
+  }
+
+  stack_u64_push(&lowpoints[np - 1], 0);
+
+  u = np - 2;
+  while (u >= 0) {
+    for (j = 0; j < nranges[u]; j++) {
+      stack_u64_push(&lowpoints[u], ranges[u * nlines + j].lb);
+      stack_u64_push(&lowpoints[u], ranges[u * nlines + j].ub + 1);
+    }
+
+    for (j = 0; j < lowpoints[u + 1].nmemb; j++) {
+      stack_u64_push(&lowpoints[u], backmap(lowpoints[u + 1].data[j], ranges,
+                                            nranges, u, nlines));
+    }
+
+    u--;
+  }
+
+  for (i = 0; i < lbs.nmemb; i++) {
+    stack_u64_push(&lowpoints[0], lbs.data[i]);
+  }
+
+  for (j = 0; j < lowpoints[0].nmemb; j++) {
+    if (is_in_ranges(lowpoints[0].data[j], &lbs, &ubs)) {
+      val = compute_value(lowpoints[0].data[j], ranges, nranges, nlines, np);
+      if (val < minval)
+        minval = val;
+    }
+  }
+
+  printf("%llu\n", minval);
+
+  return 0;
+}
diff --git a/day6/Makefile b/day6/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+LDFLAGS=-lm
+
+UTILS=../utils/reading.o ../utils/stack_u64.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES) $(LDFLAGS)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES) $(LDFLAGS)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day6/common.c b/day6/common.c
@@ -0,0 +1,35 @@
+#include "common.h"
+
+void read_data(stack_u64 *times, stack_u64 *distances, char **lines,
+               size_t nlines) {
+  char *cp = lines[0];
+  uint64_t t;
+
+  while ((cp = sread_next_u64(&t, cp)) != NULL) {
+    stack_u64_push(times, t);
+  }
+
+  cp = lines[1];
+  while ((cp = sread_next_u64(&t, cp)) != NULL) {
+    stack_u64_push(distances, t);
+  }
+}
+
+uint64_t counter(uint64_t t, uint64_t d) {
+  if (t * t < 4 * d)
+    return 0;
+
+  uint64_t r = t * t - 4 * d;
+  long double rr = sqrtl((long double)r);
+
+  uint64_t lb = (uint64_t)floorl(((long double)t - rr) / 2);
+  uint64_t ub = (uint64_t)ceill(((long double)t + rr) / 2);
+
+  while (lb * (t - lb) <= d)
+    lb++;
+
+  while (ub * (t - ub) <= d)
+    ub--;
+
+  return ub - lb + 1;
+}
diff --git a/day6/common.h b/day6/common.h
@@ -0,0 +1,17 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <math.h>
+#include <reading.h>
+#include <stack_u64.h>
+
+void read_data(stack_u64 *times, stack_u64 *distances, char **lines,
+               size_t nlines);
+uint64_t counter(uint64_t t, uint64_t d);
+
+#endif
diff --git a/day6/exinput b/day6/exinput
@@ -0,0 +1,2 @@
+Time:      7  15   30
+Distance:  9  40  200
diff --git a/day6/input b/day6/input
@@ -0,0 +1,2 @@
+Time:        59     68     82     74
+Distance:   543   1020   1664   1022
diff --git a/day6/uppga.c b/day6/uppga.c
@@ -0,0 +1,22 @@
+#include "common.h"
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+  size_t i;
+  uint64_t mul = 1;
+  stack_u64 times, distances;
+
+  stack_u64_init(&times);
+  stack_u64_init(&distances);
+
+  read_data(&times, &distances, lines, nlines);
+
+  for (i = 0; i < times.nmemb; i++)
+    mul *= counter(times.data[i], distances.data[i]);
+
+  stack_u64_clear(&times);
+  stack_u64_clear(&distances);
+
+  printf("%llu\n", mul);
+}
diff --git a/day6/uppgb.c b/day6/uppgb.c
@@ -0,0 +1,28 @@
+#include "common.h"
+#include <math.h>
+
+static inline int is_digit(char x) { return '0' <= x && x <= '9'; }
+
+static inline uint64_t read_u64(char *str) {
+  char *cp = str;
+  uint64_t r = 0;
+
+  while (*cp != '\0') {
+    if (is_digit(*cp)) {
+      r = 10 * r + (uint64_t)(*cp - '0');
+    }
+    cp++;
+  }
+
+  return r;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  uint64_t mul;
+  readlines(&lines, "input");
+
+  mul = counter(read_u64(lines[0]), read_u64(lines[1]));
+
+  printf("%llu\n", mul);
+}
diff --git a/day7/Makefile b/day7/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o ../utils/smallset.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day7/common.c b/day7/common.c
@@ -0,0 +1,56 @@
+#include "common.h"
+
+static inline size_t count_occ(uint8_t *cards, uint8_t val) {
+  size_t i;
+  size_t c = 0;
+
+  for (i = 0; i < 5; i++)
+    if (cards[i] == val)
+      c++;
+
+  return c;
+}
+
+static inline int has_occ(uint8_t *cards, size_t val) {
+  size_t i;
+  for (i = 0; i < 5; i++) {
+    if (count_occ(cards, cards[i]) >= val)
+      return 1;
+  }
+
+  return 0;
+}
+
+uint64_t hand_value(hand_t h) {
+  size_t i;
+  smallset s;
+  smallset_init(&s, 64);
+
+  for (i = 0; i < 5; i++) {
+    smallset_insert(&s, h.cards[i]);
+  }
+
+  size_t card = smallset_cardinality(&s);
+
+  smallset_clear(&s);
+
+  if (card == 1) {
+    return 7;
+  } else if (card == 2) {
+    if (has_occ(h.cards, 4)) {
+      return 6;
+    } else {
+      return 5;
+    }
+  } else if (card == 3) {
+    if (has_occ(h.cards, 3)) {
+      return 4;
+    } else {
+      return 3;
+    }
+  } else if (card == 4) {
+    return 2;
+  } else {
+    return 1;
+  }
+}
diff --git a/day7/common.h b/day7/common.h
@@ -0,0 +1,20 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <reading.h>
+#include <smallset.h>
+
+typedef struct {
+  uint8_t cards[5];
+  uint64_t maxval;
+  uint64_t bid;
+} hand_t;
+
+uint64_t hand_value(hand_t h);
+
+#endif
diff --git a/day7/exinput b/day7/exinput
@@ -0,0 +1,5 @@
+32T3K 765
+T55J5 684
+KK677 28
+KTJJT 220
+QQQJA 483
diff --git a/day7/input b/day7/input
@@ -0,0 +1,1000 @@
+3A399 27
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diff --git a/day7/uppga.c b/day7/uppga.c
@@ -0,0 +1,78 @@
+#include "common.h"
+
+int cmp(const void *a, const void *b);
+
+int cmp(const void *a, const void *b) {
+  size_t i;
+
+  hand_t ha = *(const hand_t *)a;
+  hand_t hb = *(const hand_t *)b;
+
+  uint64_t ha_val = hand_value(ha);
+  uint64_t hb_val = hand_value(hb);
+
+  if (ha_val != hb_val) {
+    if (ha_val < hb_val)
+      return -1;
+    else
+      return 1;
+  } else {
+    for (i = 0; i < 5; i++) {
+      if (ha.cards[i] != hb.cards[i]) {
+        if (ha.cards[i] < hb.cards[i])
+          return -1;
+        else
+          return 1;
+      }
+    }
+  }
+
+  return 0;
+}
+
+static inline uint8_t char_to_card(const char c) {
+  if ('2' <= c && c <= '9')
+    return (uint8_t)(c - '0');
+  switch (c) {
+  case 'T':
+    return 10;
+  case 'J':
+    return 11;
+  case 'Q':
+    return 12;
+  case 'K':
+    return 13;
+  case 'A':
+    return 14;
+  default:
+    exit(1);
+  }
+}
+
+static inline void read_hands(hand_t *h, char **lines, const size_t nlines) {
+  size_t i, j;
+
+  for (i = 0; i < nlines; i++) {
+    for (j = 0; j < 5; j++)
+      h[i].cards[j] = char_to_card(lines[i][j]);
+    sread_next_u64(&(h[i].bid), &lines[i][6]);
+  }
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  hand_t h[nlines];
+  read_hands(h, lines, nlines);
+
+  qsort(h, nlines, sizeof(h[0]), cmp);
+
+  uint64_t m;
+  uint64_t sum = 0;
+  for (m = 0; m < nlines; m++) {
+    sum += (m + 1) * h[m].bid;
+  }
+
+  printf("%llu\n", sum);
+}
diff --git a/day7/uppgb.c b/day7/uppgb.c
@@ -0,0 +1,130 @@
+#include "common.h"
+
+int cmp(const void *a, const void *b);
+
+int cmp(const void *a, const void *b) {
+  size_t i;
+
+  hand_t ha = *(const hand_t *)a;
+  hand_t hb = *(const hand_t *)b;
+
+  uint64_t ha_val = ha.maxval;
+  uint64_t hb_val = hb.maxval;
+
+  if (ha_val != hb_val) {
+    if (ha_val < hb_val)
+      return -1;
+    else
+      return 1;
+  } else {
+    for (i = 0; i < 5; i++) {
+      if (ha.cards[i] != hb.cards[i]) {
+        if (ha.cards[i] < hb.cards[i])
+          return -1;
+        else
+          return 1;
+      }
+    }
+  }
+
+  return 0;
+}
+
+static inline uint8_t char_to_card(const char c) {
+  if ('2' <= c && c <= '9')
+    return (uint8_t)(c - '0');
+  switch (c) {
+  case 'T':
+    return 10;
+  case 'J':
+    return 1;
+  case 'Q':
+    return 12;
+  case 'K':
+    return 13;
+  case 'A':
+    return 14;
+  default:
+    exit(1);
+  }
+}
+
+static inline int all_jokers_are_aces(hand_t *t, hand_t *h) {
+  size_t i;
+
+  for (i = 0; i < 5; i++) {
+    if (h->cards[i] == 1 && t->cards[i] != 14)
+      return 0;
+  }
+
+  return 1;
+}
+
+static inline void increment_jokers(hand_t *t, hand_t *h) {
+  size_t i;
+
+  for (i = 0; i < 5; i++) {
+    if (h->cards[i] == 1) {
+      if (t->cards[i] != 14) {
+        t->cards[i]++;
+        return;
+      } else {
+        t->cards[i] = 2;
+      }
+    }
+  }
+}
+
+static inline uint64_t find_max_val(hand_t h) {
+  uint64_t maxval = 0;
+  uint64_t tmpval;
+  hand_t t = h;
+
+  size_t i;
+  for (i = 0; i < 5; i++) {
+    if (t.cards[i] == 1)
+      t.cards[i] = 2;
+  }
+
+  while (!all_jokers_are_aces(&t, &h)) {
+    tmpval = hand_value(t);
+    if (tmpval > maxval)
+      maxval = tmpval;
+    increment_jokers(&t, &h);
+  }
+
+  tmpval = hand_value(t);
+  if (tmpval > maxval)
+    maxval = tmpval;
+
+  return maxval;
+}
+
+static inline void read_hands(hand_t *h, char **lines, const size_t nlines) {
+  size_t i, j;
+
+  for (i = 0; i < nlines; i++) {
+    for (j = 0; j < 5; j++)
+      h[i].cards[j] = char_to_card(lines[i][j]);
+    sread_next_u64(&(h[i].bid), &lines[i][6]);
+    h[i].maxval = find_max_val(h[i]);
+  }
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  hand_t h[nlines];
+  read_hands(h, lines, nlines);
+
+  qsort(h, nlines, sizeof(h[0]), cmp);
+
+  uint64_t m;
+  uint64_t sum = 0;
+  for (m = 0; m < nlines; m++) {
+    sum += (m + 1) * h[m].bid;
+  }
+
+  printf("%llu\n", sum);
+}
diff --git a/day8/Makefile b/day8/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+LDFLAGS=-L/usr/local/lib -lgmp
+
+UTILS=../utils/reading.o ../utils/stack_u64.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES) $(LDFLAGS)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day8/common.c b/day8/common.c
@@ -0,0 +1,20 @@
+#include "common.h"
+
+uint64_t chrs_to_node(char *s) {
+  return (((uint64_t)s[0] - 'A') * 26 * 26) + (((uint64_t)s[1] - 'A') * 26) +
+         ((uint64_t)s[2] - 'A');
+}
+
+void read_graph(uint64_t *lefts, uint64_t *rights, char **lines,
+                size_t nlines) {
+  size_t i;
+  size_t n, l, r;
+
+  for (i = 2; i < nlines; i++) {
+    n = chrs_to_node(lines[i]);
+    l = chrs_to_node(&lines[i][7]);
+    r = chrs_to_node(&lines[i][12]);
+    lefts[n] = l;
+    rights[n] = r;
+  }
+}
diff --git a/day8/common.h b/day8/common.h
@@ -0,0 +1,19 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <gmp.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <reading.h>
+#include <stack_u64.h>
+
+#define ZZZ 17575
+#define AAA 0
+
+uint64_t chrs_to_node(char *s);
+void read_graph(uint64_t *lefts, uint64_t *rights, char **lines, size_t nlines);
+
+#endif
diff --git a/day8/input b/day8/input
@@ -0,0 +1,736 @@
+LRLRRRLRRLRRRLRRRLLLLLRRRLRLRRLRLRLRRLRRLRRRLRLRLRRLLRLRRLRRLRRLRRRLLRRRLRRRLRRLRLLLRRLRRRLRLRRLRRRLRRLRLLLRRRLRRLRRLRRRLRRRLRRRLRLRLRLRRRLRRRLLLRRLLRRRLRLRLRRRLRRRLRRLRRRLRLRLLRRRLRLRRLRLRLRRLLLRRRLRRRLRRLRRLRLRRLLRRLRRRLRRRLLRRRLRRLRLLRRLRLRRLLRRRLLLLRRLRRRLRLRRLLRLLRRRLLRRLLRRRLRRRLRRLLRLRLLRRLLRLLLRRRR
+
+FCG = (PLG, GXC)
+PQT = (SQK, GHP)
+NVS = (TPQ, PPB)
+CTR = (SXS, KCV)
+FNM = (KHG, FLD)
+TFH = (CLD, CLD)
+MLQ = (QQL, JVK)
+LQR = (TFH, RRM)
+QKX = (VPR, BHD)
+QQL = (VBD, CPM)
+QST = (HPC, DFJ)
+QBX = (HPH, BTM)
+TVB = (SHJ, GMF)
+HJN = (CGJ, QXT)
+PGV = (RXT, DQP)
+TPN = (TQR, LJR)
+BHV = (TGL, GJH)
+DDF = (XLH, TDQ)
+XMK = (XVN, RJP)
+HXH = (JVM, CVB)
+SFX = (VNH, BFS)
+TRF = (HVJ, DKF)
+GGQ = (NNP, PBL)
+KQX = (VXK, FSF)
+KGL = (QSJ, CBM)
+CLC = (MCJ, JGQ)
+GFF = (JBG, TVR)
+FQT = (CMR, CKG)
+HVJ = (FXB, GBP)
+KTF = (PKG, JCL)
+BLF = (QQL, JVK)
+TVN = (QNN, DPQ)
+KVX = (XNV, CJF)
+GDK = (DVX, RKS)
+CHS = (VCL, PSG)
+LFS = (SNS, NTG)
+NCR = (LFV, DRN)
+NLJ = (RCR, XCF)
+SRD = (LGT, PRS)
+FQC = (GBX, RGQ)
+SJH = (CKG, CMR)
+BQP = (PPP, HGT)
+LJR = (FPV, FQD)
+XTP = (PDT, MTX)
+RDG = (JRL, MFF)
+TFF = (MJQ, MVB)
+NGS = (BDG, KHS)
+GXT = (QSJ, CBM)
+VVD = (HJJ, RNK)
+FRL = (CHS, JNV)
+RQS = (CFM, SKM)
+PRS = (VTG, PRR)
+FCD = (VTN, DJQ)
+PDT = (DST, DST)
+MND = (MFV, GDR)
+GJG = (TMJ, HPJ)
+JSL = (DDN, JPZ)
+DNX = (RHD, LKM)
+BGM = (GFC, JTD)
+BPC = (BMN, BKQ)
+PPB = (BFT, PVH)
+VRK = (TCL, JDS)
+MBT = (CBB, JMM)
+JGQ = (GGQ, DFH)
+BGP = (MGH, VHG)
+GGR = (TCX, QLG)
+NCD = (XDT, SSK)
+TDQ = (VPK, HCF)
+PND = (BKV, THD)
+RJP = (KRV, FQN)
+MFZ = (MRL, MFK)
+TCM = (RMM, CLB)
+SDF = (LTS, RVQ)
+KGS = (CTR, SJQ)
+SFK = (SDF, HPF)
+DJC = (MKF, PNR)
+DPF = (KBH, QQX)
+VQJ = (FVB, XPK)
+CGX = (MLQ, BLF)
+GBS = (DJC, XXQ)
+JSV = (RMR, QFK)
+KHS = (HSQ, PTD)
+MKG = (NLJ, MHQ)
+CXQ = (BDG, KHS)
+RRQ = (FCT, CDT)
+JSK = (LBC, CPT)
+VSM = (RGM, VMR)
+NNP = (SRD, VNQ)
+PRR = (GMX, KQX)
+HNP = (GQJ, DGS)
+PKB = (KBL, HXJ)
+MFS = (RMK, JBX)
+RMM = (MFG, BPS)
+PJM = (SFK, HLG)
+BCH = (SRK, LSG)
+VNQ = (LGT, PRS)
+LTC = (TJX, DQD)
+CKG = (NJG, GMJ)
+RPS = (RXT, DQP)
+CCV = (DPB, JQT)
+JDF = (CFF, XFB)
+LQX = (KBD, TVD)
+VLL = (FMK, LCD)
+RTB = (NTG, SNS)
+FBF = (QTH, QFV)
+CBB = (VJK, BHB)
+BCL = (LJR, TQR)
+JDS = (SPS, HRL)
+HHB = (RHD, LKM)
+PLG = (RBV, NJD)
+RNB = (VMR, RGM)
+CJT = (HJJ, RNK)
+JVK = (VBD, CPM)
+HXJ = (JTL, PFD)
+JGX = (XMV, RHF)
+FGT = (LFR, JSK)
+MJQ = (BVP, BXM)
+DFJ = (MRS, LTC)
+GNG = (DPB, JQT)
+VCA = (XFL, JSV)
+KLR = (LTN, BXH)
+VGN = (DGS, GQJ)
+DVX = (JXX, XSH)
+BTN = (PFP, FRL)
+DTM = (DVD, FCF)
+SVN = (PBF, GXR)
+RCC = (BTB, CBD)
+GMJ = (FCH, CSP)
+DVS = (FSV, TVP)
+RLG = (QML, XGD)
+CVV = (HHB, DNX)
+NRG = (NFG, DNL)
+PQC = (RNG, KTF)
+KGG = (DMD, HQG)
+JNV = (PSG, VCL)
+SNS = (CGX, MBK)
+FRA = (MFK, MRL)
+BPN = (QQX, KBH)
+HCQ = (XMK, JDV)
+RDD = (JGB, VHQ)
+HTF = (VLX, RQV)
+XFH = (DPH, RGG)
+LBC = (JTV, DTK)
+RBP = (LLL, MND)
+GDV = (SHJ, GMF)
+MJV = (JGV, JGV)
+BQR = (FPK, HSS)
+XDT = (BTN, FXF)
+NGM = (NTF, BDN)
+HPP = (FQX, FGT)
+JPC = (JHC, PPH)
+GCV = (CCS, TCM)
+VHQ = (PBR, GVP)
+MDD = (GGR, LXC)
+HSQ = (CKV, KGS)
+PPP = (DLP, HPP)
+SNA = (BKK, FNM)
+VLS = (DPH, RGG)
+JGB = (PBR, GVP)
+FPK = (RGS, XKQ)
+LVB = (XMC, MNX)
+FDP = (PFR, GFP)
+NKS = (PCH, TJR)
+VLX = (TLH, KFD)
+DLT = (HGV, XJR)
+MBK = (MLQ, BLF)
+RNG = (PKG, PKG)
+BKV = (DXB, GDQ)
+LLL = (GDR, MFV)
+LNN = (MVG, CKJ)
+FXH = (TCM, CCS)
+TPQ = (BFT, PVH)
+MRH = (CJR, TFF)
+MVG = (BQP, DXC)
+LLN = (VTN, DJQ)
+MLS = (THD, BKV)
+HFR = (HNP, VGN)
+XNF = (PVL, TPD)
+JQT = (DVS, PST)
+LNH = (FHQ, SPG)
+MBR = (LQR, VPM)
+KNV = (SKG, CKF)
+JCV = (XMV, RHF)
+JQJ = (TCQ, BGM)
+SQF = (NRG, HDK)
+FHF = (NNQ, PKB)
+BDG = (HSQ, PTD)
+PBT = (JRL, MFF)
+LNS = (TCQ, BGM)
+PTD = (CKV, KGS)
+LHX = (GRM, XJQ)
+NXN = (SFX, NQC)
+VSZ = (XFS, DHL)
+DPG = (JTS, VBG)
+QTH = (DLT, JNS)
+PMG = (TCL, JDS)
+CCD = (FCG, GPJ)
+SSP = (HTF, MNV)
+STX = (HPC, DFJ)
+KSR = (GKB, TSX)
+KDP = (XGR, LLK)
+NNQ = (HXJ, KBL)
+TPM = (PDT, PDT)
+SJQ = (KCV, SXS)
+PJH = (BPN, DPF)
+JBG = (FPN, XBP)
+XQQ = (TLR, TLR)
+XJL = (FTX, DXR)
+RXT = (RMD, KVX)
+CLD = (NTK, NTK)
+SDM = (MRH, TGC)
+RQV = (TLH, KFD)
+NDL = (VDT, VDT)
+CCT = (QFV, QTH)
+LXL = (VGH, FRM)
+TJR = (KGL, GXT)
+VBD = (RSG, NCR)
+XBG = (BHV, NPX)
+JTS = (QDH, CST)
+BFT = (JDF, MXT)
+XLH = (HCF, VPK)
+XBP = (GCV, FXH)
+JPF = (RNG, KTF)
+HHN = (TMJ, HPJ)
+FSV = (GMC, HJN)
+XFB = (JRN, RDD)
+JPZ = (FNM, BKK)
+BBP = (KDP, KKM)
+TGL = (TGX, XRF)
+JCL = (JDT, JDP)
+RRS = (XPK, FVB)
+NSB = (MCJ, JGQ)
+DMD = (GFG, FDP)
+FFX = (VBG, JTS)
+XRF = (XFH, VLS)
+LSG = (MFX, CVC)
+BJZ = (FNK, QKX)
+DLP = (FGT, FQX)
+JDV = (RJP, XVN)
+HDK = (DNL, NFG)
+GQP = (NQC, SFX)
+NFG = (PMG, VRK)
+CSP = (GDP, NDV)
+BKK = (FLD, KHG)
+SCK = (KKM, KDP)
+DXR = (SCK, BBP)
+JVG = (PBT, RDG)
+GSV = (QTK, JNT)
+QXT = (BPC, NXQ)
+GDQ = (LFJ, KSF)
+NHG = (VVD, CJT)
+DHL = (LNH, RPP)
+NFS = (JGV, MFZ)
+FCS = (BTB, CBD)
+JGH = (VHP, RMG)
+VQC = (GDC, VKQ)
+PCH = (KGL, GXT)
+LGT = (PRR, VTG)
+PFV = (QCC, VSZ)
+QQX = (FTV, LBD)
+QFV = (JNS, DLT)
+SCN = (RVX, RBP)
+QRH = (BCL, TPN)
+GBX = (VRH, CPG)
+NTF = (RBK, RRN)
+NDQ = (MBR, RDL)
+KCP = (GFF, DDG)
+JBX = (JPF, PQC)
+GMF = (KLR, VTD)
+JVM = (TXL, XTR)
+BLC = (MNJ, VFF)
+VTH = (TGC, MRH)
+JHB = (BPN, DPF)
+TMJ = (PND, MLS)
+PFH = (HSS, FPK)
+TDG = (KJV, QTR)
+TGC = (TFF, CJR)
+TVD = (CCT, FBF)
+TKX = (FCT, CDT)
+BKS = (HLG, SFK)
+CGJ = (NXQ, BPC)
+QHN = (SKG, CKF)
+CVJ = (DMD, HQG)
+BMN = (JLD, NHG)
+GRP = (NDL, NDL)
+FTX = (BBP, SCK)
+DXC = (PPP, HGT)
+NJD = (XSP, KSC)
+CST = (RRQ, TKX)
+SVH = (JHC, PPH)
+JTV = (GCM, RLG)
+BXJ = (DVD, FCF)
+HCV = (XDT, SSK)
+RDL = (LQR, VPM)
+PSG = (MFS, MFC)
+MVQ = (DRH, QBX)
+XCF = (FVM, VVS)
+DXB = (KSF, LFJ)
+GHN = (JGH, FGR)
+KLJ = (LSL, QJJ)
+DFH = (NNP, PBL)
+CDL = (XBG, FGD)
+VFF = (KGR, FCJ)
+KBD = (FBF, CCT)
+NJL = (JGH, FGR)
+VHG = (MBT, XPT)
+GKB = (GJB, JKK)
+KQP = (CXQ, NGS)
+VSX = (GDC, VKQ)
+RHX = (CDL, RGD)
+NTK = (QCC, QCC)
+KFD = (SKK, HGC)
+ZZZ = (VFF, MNJ)
+JLK = (HPL, MDF)
+BTB = (PFT, CCD)
+HQG = (GFG, FDP)
+FVM = (VHC, NGC)
+CVD = (NQP, FXM)
+VGH = (CCV, GNG)
+LSV = (NLJ, MHQ)
+PVX = (KGG, CVJ)
+THL = (NJL, GHN)
+KKM = (XGR, LLK)
+XGR = (LRT, DFP)
+RRN = (TPM, XTP)
+GBP = (GTD, QSL)
+KJV = (MDD, QKK)
+TBN = (TLV, JLK)
+LDG = (TPN, BCL)
+JLD = (CJT, VVD)
+DKN = (CXQ, NGS)
+DGV = (HCV, NCD)
+HRL = (QHN, KNV)
+RRM = (CLD, TQC)
+RJS = (MGH, VHG)
+MFF = (QTV, GJF)
+PNR = (BTT, TVN)
+JKK = (RVV, XPG)
+XKQ = (PQT, FJD)
+RMK = (JPF, PQC)
+LCD = (RJS, BGP)
+QTK = (GJG, HHN)
+TBK = (CVB, JVM)
+VTG = (GMX, KQX)
+GFG = (PFR, GFP)
+RSG = (LFV, LFV)
+VCS = (PCH, TJR)
+LJC = (QXF, XQR)
+QHD = (XFM, LQM)
+TSD = (PPB, TPQ)
+RHP = (MXX, MTC)
+GLZ = (JSV, XFL)
+NXD = (VQJ, RRS)
+MTJ = (QJJ, LSL)
+XQH = (NQP, FXM)
+GLK = (XCX, NDQ)
+LSL = (NVS, TSD)
+QGC = (LHX, LHT)
+RHF = (GHM, TBT)
+TQR = (FQD, FPV)
+QSC = (XCX, NDQ)
+RKS = (JXX, XSH)
+HGC = (DCG, GDD)
+XNV = (VQG, PVR)
+CCS = (RMM, CLB)
+RVR = (SJH, FQT)
+JCM = (BKS, PJM)
+GHM = (FCS, RCC)
+PFT = (FCG, GPJ)
+XDJ = (DTS, JVG)
+RVQ = (FQC, PLV)
+LQM = (RMH, XDJ)
+CKV = (SJQ, CTR)
+HPH = (TLX, RQG)
+MTC = (FFX, DPG)
+CKJ = (BQP, DXC)
+MXT = (CFF, XFB)
+VHT = (MQG, GTH)
+QJJ = (TSD, NVS)
+HNA = (DHL, XFS)
+PVS = (TDG, SLR)
+FPV = (GMD, GTK)
+DDG = (TVR, JBG)
+BHD = (LLN, FCD)
+LDF = (NNQ, PKB)
+CKF = (XXD, MJL)
+TJF = (NRG, HDK)
+JDT = (BLC, BLC)
+GXR = (MGP, FNX)
+BPS = (XNF, MXR)
+FXB = (QSL, GTD)
+TLH = (HGC, SKK)
+PKV = (NCD, HCV)
+CBM = (NXD, GTR)
+JNT = (GJG, HHN)
+TCQ = (JTD, GFC)
+MRS = (TJX, DQD)
+FBP = (VGN, HNP)
+HPC = (MRS, LTC)
+TJX = (PKV, DGV)
+LFV = (MJV, MJV)
+XVM = (SQF, TJF)
+VVF = (PGV, RPS)
+XPG = (DGF, DJK)
+RGD = (XBG, FGD)
+GMC = (QXT, CGJ)
+CFM = (VVF, QPN)
+SPS = (QHN, KNV)
+JTL = (MNM, PTS)
+MNM = (SXH, BDT)
+RGG = (LNS, JQJ)
+FPN = (GCV, FXH)
+XJR = (KCP, HJS)
+FQN = (LQX, MVF)
+CFF = (JRN, RDD)
+KSC = (QGH, LPG)
+BHB = (DMR, JTX)
+TBT = (RCC, FCS)
+SKM = (VVF, QPN)
+PVR = (PVS, PQQ)
+QDN = (XMK, JDV)
+JXX = (STX, QST)
+TXL = (LKK, NSD)
+XTR = (NSD, LKK)
+VKQ = (HXH, TBK)
+FQX = (JSK, LFR)
+FRM = (CCV, GNG)
+AAA = (MNJ, VFF)
+BKQ = (NHG, JLD)
+DPQ = (MGT, LXL)
+KXL = (VQC, VSX)
+RVV = (DGF, DGF)
+TQC = (NTK, PFV)
+NPX = (GJH, TGL)
+MGH = (XPT, MBT)
+VMR = (HGG, RHX)
+DCG = (CLF, GBS)
+CVB = (TXL, XTR)
+HPJ = (MLS, PND)
+NNR = (GDV, TVB)
+RVX = (MND, LLL)
+BVL = (SKM, CFM)
+RFS = (XQR, QXF)
+TVR = (XBP, FPN)
+VTD = (LTN, BXH)
+GPC = (XHK, BMP)
+QGH = (RNB, VSM)
+GDR = (PJH, JHB)
+RMG = (KXL, TBV)
+PST = (TVP, FSV)
+GPJ = (GXC, PLG)
+LBD = (KTN, GVD)
+LLK = (LRT, DFP)
+KGR = (MVQ, LKQ)
+MQG = (XJL, NHN)
+QXF = (NSH, STD)
+GMD = (PFH, BQR)
+BFS = (KGN, QHD)
+RCR = (FVM, VVS)
+RPP = (SPG, FHQ)
+FMK = (BGP, RJS)
+FGR = (RMG, VHP)
+SXH = (RTB, LFS)
+GVD = (GRP, TCF)
+TGX = (XFH, VLS)
+JTD = (NCJ, TBN)
+MFV = (PJH, JHB)
+HGV = (KCP, HJS)
+HSS = (XKQ, RGS)
+PTS = (BDT, SXH)
+XSP = (LPG, QGH)
+TCX = (PVX, XVF)
+LKQ = (QBX, DRH)
+FSF = (LSV, MKG)
+XJQ = (RHP, NXM)
+NHN = (FTX, DXR)
+GQJ = (KQP, DKN)
+TLX = (XQH, CVD)
+HJJ = (VCS, NKS)
+GTR = (VQJ, RRS)
+RHD = (FJR, RVR)
+VXK = (LSV, MKG)
+MNX = (HBT, CLM)
+PPH = (LVB, MRB)
+GDP = (LCB, GDK)
+DJQ = (BVL, RQS)
+FCJ = (MVQ, LKQ)
+VHC = (VHT, BSP)
+PVL = (PPR, SSP)
+LCB = (DVX, RKS)
+PFD = (MNM, PTS)
+MVF = (KBD, TVD)
+DJK = (XQQ, TVF)
+QSL = (GSV, KCF)
+NXM = (MXX, MTC)
+TJT = (CKJ, MVG)
+GTH = (NHN, XJL)
+SQK = (SPP, JCM)
+DPH = (LNS, JQJ)
+QPN = (RPS, PGV)
+SRK = (MFX, CVC)
+RFJ = (GKB, TSX)
+QLG = (XVF, PVX)
+QTV = (HLR, VLL)
+PLV = (GBX, RGQ)
+GHR = (SVH, JPC)
+XMV = (GHM, TBT)
+PKG = (JDT, JDT)
+MGP = (RPG, QGC)
+QDH = (TKX, RRQ)
+HJR = (RBP, RVX)
+NDV = (LCB, GDK)
+KRV = (MVF, LQX)
+NTM = (TJF, SQF)
+NXQ = (BKQ, BMN)
+HFF = (VDT, JSL)
+SLR = (QTR, KJV)
+DDN = (BKK, FNM)
+LHT = (XJQ, GRM)
+DST = (QKX, FNK)
+PPR = (MNV, HTF)
+JHC = (LVB, MRB)
+MXX = (DPG, FFX)
+VDT = (DDN, DDN)
+XMC = (HBT, CLM)
+TPD = (SSP, PPR)
+BSP = (GTH, MQG)
+NJG = (FCH, CSP)
+MGT = (VGH, FRM)
+NCJ = (TLV, JLK)
+VCN = (NSB, CLC)
+CBD = (CCD, PFT)
+NQB = (XHK, BMP)
+MFG = (XNF, MXR)
+XFL = (RMR, QFK)
+KCF = (JNT, QTK)
+JTX = (MKB, NGM)
+NTG = (MBK, CGX)
+XCX = (MBR, RDL)
+HGT = (HPP, DLP)
+FJD = (GHP, SQK)
+FXF = (PFP, FRL)
+GFC = (TBN, NCJ)
+NSD = (HFR, FBP)
+HJS = (DDG, GFF)
+MNV = (RQV, VLX)
+VRH = (MTJ, KLJ)
+GJH = (XRF, TGX)
+JMM = (BHB, VJK)
+BDN = (RBK, RRN)
+JDP = (BLC, ZZZ)
+GJK = (HHB, DNX)
+TCF = (NDL, HFF)
+JGV = (MFK, MRL)
+LPG = (VSM, RNB)
+KBH = (FTV, LBD)
+CDT = (NXN, GQP)
+QKK = (GGR, LXC)
+RMD = (CJF, XNV)
+MKF = (TVN, BTT)
+RBV = (XSP, KSC)
+RMH = (JVG, DTS)
+RPG = (LHT, LHX)
+FCH = (NDV, GDP)
+HPF = (LTS, RVQ)
+DRH = (BTM, HPH)
+PFR = (RJR, DBR)
+RJR = (SVN, VXJ)
+MFK = (HCQ, QDN)
+RGQ = (VRH, CPG)
+BSX = (GHN, NJL)
+TLR = (XFL, JSV)
+KCV = (NQF, BCH)
+PJC = (JGX, JCV)
+XVF = (KGG, CVJ)
+DKF = (GBP, FXB)
+SKG = (XXD, MJL)
+MVB = (BVP, BXM)
+MJL = (GJK, CVV)
+NSH = (VCN, VXF)
+DVD = (BCQ, PJC)
+VPR = (LLN, FCD)
+HLG = (SDF, HPF)
+FLD = (BXJ, DTM)
+SKK = (GDD, DCG)
+NQF = (SRK, LSG)
+QNN = (LXL, MGT)
+DMR = (MKB, NGM)
+FVB = (NNR, PBH)
+MXR = (TPD, PVL)
+CLF = (DJC, XXQ)
+FCT = (GQP, NXN)
+RPA = (QKX, FNK)
+MHQ = (XCF, RCR)
+XPK = (PBH, NNR)
+RBK = (TPM, TPM)
+LVX = (TDQ, XLH)
+RMR = (SDM, VTH)
+PBF = (FNX, MGP)
+GCM = (QML, XGD)
+KSF = (BSX, THL)
+XXD = (GJK, CVV)
+DBR = (VXJ, SVN)
+THD = (DXB, GDQ)
+LFR = (LBC, CPT)
+LKK = (FBP, HFR)
+GFP = (RJR, DBR)
+RNK = (VCS, NKS)
+PBL = (VNQ, SRD)
+FXM = (DDF, LVX)
+KGN = (XFM, LQM)
+VPK = (GPC, NQB)
+JNS = (HGV, XJR)
+GTK = (BQR, PFH)
+FTV = (KTN, GVD)
+MCJ = (DFH, GGQ)
+MDF = (LJC, RFS)
+JRL = (GJF, QTV)
+MFC = (RMK, JBX)
+VVS = (NGC, VHC)
+TVF = (TLR, GLZ)
+FCF = (BCQ, PJC)
+SXS = (NQF, BCH)
+GDC = (HXH, TBK)
+XXQ = (MKF, PNR)
+SPG = (GMR, TRF)
+GVP = (LNN, TJT)
+PQQ = (SLR, TDG)
+HBT = (QRH, LDG)
+XGD = (KSR, RFJ)
+QML = (KSR, RFJ)
+LKM = (RVR, FJR)
+DRN = (MJV, NFS)
+MKB = (NTF, BDN)
+GHP = (JCM, SPP)
+XPT = (JMM, CBB)
+KTN = (GRP, TCF)
+LRT = (SCN, HJR)
+BVP = (QKT, GHR)
+FNK = (VPR, BHD)
+GRM = (RHP, NXM)
+BXM = (QKT, GHR)
+CPM = (RSG, NCR)
+MRL = (HCQ, QDN)
+VQG = (PVS, PQQ)
+STD = (VXF, VCN)
+DQD = (DGV, PKV)
+TSX = (GJB, JKK)
+GTD = (KCF, GSV)
+FNX = (RPG, QGC)
+BXH = (LDF, FHF)
+CVC = (GLK, QSC)
+TLV = (MDF, HPL)
+DNL = (PMG, VRK)
+FQD = (GTK, GMD)
+CPG = (MTJ, KLJ)
+SPP = (BKS, PJM)
+GJB = (RVV, XPG)
+SSK = (FXF, BTN)
+PVH = (MXT, JDF)
+XVN = (FQN, KRV)
+LFJ = (BSX, THL)
+VNH = (KGN, QHD)
+HLR = (FMK, LCD)
+KBL = (JTL, PFD)
+BTM = (TLX, RQG)
+DPB = (PST, DVS)
+LTS = (FQC, PLV)
+RQG = (CVD, XQH)
+PBR = (LNN, TJT)
+CLB = (MFG, BPS)
+XFM = (RMH, XDJ)
+CJR = (MJQ, MVB)
+VTN = (BVL, RQS)
+VBG = (QDH, CST)
+GMR = (HVJ, DKF)
+KHG = (BXJ, DTM)
+GDD = (CLF, GBS)
+QTR = (QKK, MDD)
+VCL = (MFS, MFC)
+TBV = (VQC, VSX)
+BCQ = (JCV, JGX)
+NGC = (VHT, BSP)
+GJF = (HLR, VLL)
+FGD = (NPX, BHV)
+RGS = (PQT, FJD)
+VXJ = (PBF, GXR)
+FJR = (SJH, FQT)
+VXF = (CLC, NSB)
+HCF = (GPC, NQB)
+DTK = (RLG, GCM)
+MRB = (XMC, MNX)
+MFX = (QSC, GLK)
+GMX = (VXK, FSF)
+BDT = (LFS, RTB)
+JRN = (VHQ, JGB)
+SHJ = (KLR, VTD)
+TCL = (HRL, SPS)
+CPT = (DTK, JTV)
+VPM = (TFH, RRM)
+DQP = (RMD, KVX)
+CJF = (VQG, PVR)
+PBH = (GDV, TVB)
+LXC = (QLG, TCX)
+FHQ = (GMR, TRF)
+BMP = (XVM, NTM)
+XHK = (NTM, XVM)
+NQP = (LVX, DDF)
+TVP = (GMC, HJN)
+XFS = (LNH, RPP)
+RGM = (RHX, HGG)
+NQC = (VNH, BFS)
+GXC = (RBV, NJD)
+XQR = (NSH, STD)
+BTT = (QNN, DPQ)
+PFP = (CHS, JNV)
+QKT = (SVH, JPC)
+QCC = (DHL, XFS)
+LTN = (LDF, FHF)
+CMR = (GMJ, NJG)
+DGF = (XQQ, XQQ)
+MTX = (DST, BJZ)
+QSJ = (GTR, NXD)
+DFP = (HJR, SCN)
+MNJ = (FCJ, KGR)
+XSH = (QST, STX)
+VHP = (KXL, TBV)
+DGS = (KQP, DKN)
+HPL = (LJC, RFS)
+DTS = (RDG, PBT)
+VJK = (JTX, DMR)
+CLM = (LDG, QRH)
+QFK = (SDM, VTH)
+HGG = (CDL, RGD)
diff --git a/day8/uppga.c b/day8/uppga.c
@@ -0,0 +1,28 @@
+#include "common.h"
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  char *instructions = lines[0];
+  uint64_t lefts[ZZZ + 1];
+  uint64_t rights[ZZZ + 1];
+
+  read_graph(lefts, rights, lines, nlines);
+
+  uint64_t n = AAA;
+  uint64_t count = 0;
+  while (n != ZZZ) {
+    if (*instructions == 'L')
+      n = lefts[n];
+    else if (*instructions == 'R')
+      n = rights[n];
+    count++;
+
+    instructions++;
+    if (*instructions != 'R' && *instructions != 'L')
+      instructions = lines[0];
+  }
+
+  printf("%llu\n", count);
+}
diff --git a/day8/uppgb.c b/day8/uppgb.c
@@ -0,0 +1,122 @@
+#include "common.h"
+
+#define ZZZ 17575
+#define AAA 0
+
+static inline stack_u64 read_starts(char **lines, size_t nlines) {
+  size_t i;
+  stack_u64 r;
+  stack_u64_init(&r);
+
+  for (i = 2; i < nlines; i++) {
+    if (lines[i][2] == 'A') {
+      stack_u64_push(&r, chrs_to_node(lines[i]));
+    }
+  }
+
+  return r;
+}
+
+// positition = (value, ins) where 0 <= ins < #instructions
+typedef struct {
+  uint64_t v;
+  size_t ins;
+} pos_t;
+
+typedef struct {
+  uint64_t *ls;
+  uint64_t *rs;
+
+  char *ins;
+  size_t nins;
+} gr_t;
+
+static inline pos_t stepf(pos_t x, gr_t *g) {
+  pos_t r;
+  r.ins = (x.ins + 1) % g->nins;
+  if (g->ins[x.ins] == 'L') {
+    r.v = g->ls[x.v];
+  } else {
+    r.v = g->rs[x.v];
+  }
+
+  return r;
+}
+
+static inline void floyd(stack_u64 *mus, stack_u64 *lams, pos_t s, gr_t *g) {
+  pos_t tortoise = stepf(s, g);
+  pos_t hare = stepf(tortoise, g);
+
+  while (tortoise.v != hare.v || tortoise.ins != hare.ins) {
+    tortoise = stepf(tortoise, g);
+    hare = stepf(stepf(hare, g), g);
+  }
+
+  uint64_t mu = 0;
+  tortoise = s;
+  while (tortoise.v != hare.v || tortoise.ins != hare.ins) {
+    tortoise = stepf(tortoise, g);
+    hare = stepf(hare, g);
+    mu++;
+  }
+
+  uint64_t lam = 1;
+  hare = stepf(tortoise, g);
+  while (tortoise.v != hare.v || tortoise.ins != hare.ins) {
+    hare = stepf(hare, g);
+    lam++;
+  }
+
+  stack_u64_push(mus, mu);
+  stack_u64_push(lams, lam);
+}
+
+static uint64_t lcm(stack_u64 *s) {
+  mpz_t l, t1;
+  mpz_inits(l, t1, NULL);
+  mpz_set_ui(l, s->data[0]);
+
+  size_t i;
+  for (i = 1; i < s->nmemb; i++) {
+    mpz_set_ui(t1, s->data[i]);
+    mpz_lcm(l, l, t1);
+  }
+
+  uint64_t r = mpz_get_ui(l);
+
+  mpz_clears(l, t1, NULL);
+
+  return r;
+}
+
+int main(int argc, char **argv) {
+  size_t i, nins = 0;
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+
+  char *instructions = lines[0];
+  while (instructions[nins] == 'R' || instructions[nins] == 'L') {
+    nins++;
+  }
+
+  uint64_t lefts[ZZZ + 1];
+  uint64_t rights[ZZZ + 1];
+  read_graph(lefts, rights, lines, nlines);
+
+  gr_t g = {lefts, rights, instructions, nins};
+
+  stack_u64 starts = read_starts(lines, nlines);
+  stack_u64 mus, lams;
+  stack_u64_init(&mus);
+  stack_u64_init(&lams);
+
+  for (i = 0; i < starts.nmemb; i++) {
+    pos_t first = {starts.data[i], 0};
+    floyd(&mus, &lams, first, &g);
+  }
+
+  uint64_t lcm_lam = lcm(&lams);
+  printf("%llu\n", lcm_lam);
+
+  stack_u64_clear(&starts);
+}
diff --git a/day9/Makefile b/day9/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o ../utils/stack_u64.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/day9/common.c b/day9/common.c
@@ -0,0 +1,3 @@
+#include "common.h"
+
+size_t fn(char **lines, size_t nlines) { return 0; }
diff --git a/day9/common.h b/day9/common.h
@@ -0,0 +1,14 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <reading.h>
+#include <stack_u64.h>
+
+size_t fn(char **lines, size_t nlines);
+
+#endif
diff --git a/day9/exinput b/day9/exinput
@@ -0,0 +1,3 @@
+0 3 6 9 12 15
+1 3 6 10 15 21
+10 13 16 21 30 45
diff --git a/day9/input b/day9/input
@@ -0,0 +1,200 @@
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diff --git a/day9/uppga.c b/day9/uppga.c
@@ -0,0 +1,69 @@
+#include "common.h"
+
+#define MAX_LINE 256
+
+static size_t readline_i64s(int64_t *out, const size_t max, char *line) {
+  char *cp = line;
+  size_t i = 0;
+
+  while ((cp = sread_next_i64(&out[i], cp)) != NULL) {
+    i++;
+    if (i >= max)
+      break;
+  }
+
+  return i;
+}
+
+static int allzeros(int64_t *x, size_t n) {
+  size_t i;
+  for (i = 0; i < n; i++) {
+    if (x[i] != 0)
+      return 0;
+  }
+  return 1;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+  size_t i, j, k;
+
+  int64_t ln[MAX_LINE];
+  size_t nln;
+
+  int64_t summarum = 0;
+  for (i = 0; i < nlines; i++) {
+    nln = readline_i64s(ln, MAX_LINE, lines[i]);
+    int64_t *diffs = malloc((nln + 1) * (nln + 1) * sizeof(*diffs));
+
+    // row 0 is just input
+    for (j = 0; j < nln; j++)
+      diffs[j] = ln[j];
+
+    j = 0;
+    size_t cnln = nln;
+    while (!allzeros(&diffs[j * (nln + 1)], cnln)) {
+      j++;
+      cnln--;
+      for (k = 0; k < cnln; k++) {
+        diffs[j * (nln + 1) + k] =
+            diffs[(j - 1) * (nln + 1) + k + 1] - diffs[(j - 1) * (nln + 1) + k];
+      }
+    }
+
+    // goin' back up
+    diffs[j * (nln + 1) + cnln] = 0;
+    while (cnln < nln) {
+      j--;
+      cnln++;
+      diffs[j * (nln + 1) + cnln] = diffs[(j + 1) * (nln + 1) + cnln - 1] +
+                                    diffs[j * (nln + 1) + cnln - 1];
+    }
+    summarum += diffs[j * (nln + 1) + cnln];
+
+    free(diffs);
+  }
+
+  printf("%lld\n", summarum);
+}
diff --git a/day9/uppgb.c b/day9/uppgb.c
@@ -0,0 +1,69 @@
+#include "common.h"
+
+#define MAX_LINE 256
+
+static size_t readline_i64s(int64_t *out, const size_t max, char *line) {
+  char *cp = line;
+  size_t i = 0;
+
+  while ((cp = sread_next_i64(&out[i], cp)) != NULL) {
+    i++;
+    if (i >= max)
+      break;
+  }
+
+  return i;
+}
+
+static int allzeros(int64_t *x, size_t n) {
+  size_t i;
+  for (i = 0; i < n; i++) {
+    if (x[i] != 0)
+      return 0;
+  }
+  return 1;
+}
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+  size_t i, j, k;
+  int64_t ln[MAX_LINE];
+  size_t nln;
+
+  int64_t summarum = 0;
+  for (i = 0; i < nlines; i++) {
+    nln = readline_i64s(ln, MAX_LINE, lines[i]);
+
+    int64_t *diffs = malloc((nln + 1) * (nln + 1) * sizeof(*diffs));
+
+    // row 0 is just input
+    for (j = 0; j < nln; j++)
+      diffs[j] = ln[j];
+
+    j = 0;
+    size_t cnln = nln;
+    while (!allzeros(&diffs[j * (nln + 1)], cnln)) {
+      j++;
+      cnln--;
+      for (k = 0; k < cnln; k++) {
+        diffs[j * (nln + 1) + k] =
+            diffs[(j - 1) * (nln + 1) + k + 1] - diffs[(j - 1) * (nln + 1) + k];
+      }
+    }
+
+    // goin' back up
+    diffs[j * (nln + 1) + cnln] = 0;
+    while (cnln < nln) {
+      j--;
+      cnln++;
+      diffs[j * (nln + 1) + cnln] =
+          diffs[j * (nln + 1)] - diffs[(j + 1) * (nln + 1) + cnln - 1];
+    }
+    summarum += diffs[j * (nln + 1) + cnln];
+
+    free(diffs);
+  }
+
+  printf("%lld\n", summarum);
+}
diff --git a/template/Makefile b/template/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+CFLAGS+=-I../utils
+#LDFLAGS=
+
+UTILS=../utils/reading.o
+INCLUDES=-I../utils
+
+all: utils common.o uppga uppgb
+
+common.o: common.c common.h
+	$(CC) $(CFLAGS) -c common.c $(INCLUDES)
+
+uppga: $(UTILS) common.o uppga.c
+	$(CC) $(CFLAGS) -o uppga uppga.c common.o $(UTILS) $(INCLUDES)
+
+uppgb: $(UTILS) common.o uppgb.c
+	$(CC) $(CFLAGS) -o uppgb uppgb.c common.o $(UTILS) $(INCLUDES)
+
+utils:
+	make -C ../utils
+
+clean:
+	rm -rf common.o uppga uppgb
diff --git a/template/common.c b/template/common.c
@@ -0,0 +1,3 @@
+#include "common.h"
+
+size_t fn(char **lines, size_t nlines) { return 0; }
diff --git a/template/common.h b/template/common.h
@@ -0,0 +1,13 @@
+#ifndef COMMON_H_
+#define COMMON_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <reading.h>
+
+size_t fn(char **lines, size_t nlines);
+
+#endif
diff --git a/template/uppga.c b/template/uppga.c
@@ -0,0 +1,7 @@
+#include "common.h"
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+  printf("#lines: %lu\n", nlines);
+}
diff --git a/template/uppgb.c b/template/uppgb.c
@@ -0,0 +1,7 @@
+#include "common.h"
+
+int main(int argc, char **argv) {
+  char **lines;
+  size_t nlines = readlines(&lines, "input");
+  printf("#lines: %lu\n", nlines);
+}
diff --git a/utils/Makefile b/utils/Makefile
@@ -0,0 +1,19 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+#LDFLAGS=
+
+OBJS=reading.o stack_u64.o stack_str.o sd.o stack_sd.o ht.o smallset.o set_u64.o fheap.o set_u64p.o wdg.o graph.o dg.o dict.o
+
+all: $(OBJS)
+
+.c.o:
+	$(CC) $(CFLAGS) -c $<
+
+clean:
+	rm -rf $(OBJS)
diff --git a/utils/dg.c b/utils/dg.c
@@ -0,0 +1,21 @@
+#include "dg.h"
+
+void dg_init(dg_t *g, const size_t n) {
+  g->n = n;
+  g->nbrs = malloc(n * sizeof(*(g->nbrs)));
+
+  size_t i;
+  for (i = 0; i < n; i++)
+    stack_u64_init(&g->nbrs[i]);
+}
+
+void dg_clear(dg_t *g) {
+  size_t i;
+  for (i = 0; i < g->n; i++)
+    stack_u64_clear(&g->nbrs[i]);
+  free(g->nbrs);
+}
+
+void dg_add_edge(dg_t *g, const size_t v, const size_t w) {
+  stack_u64_push(&g->nbrs[v], w);
+}
diff --git a/utils/dg.h b/utils/dg.h
@@ -0,0 +1,15 @@
+#ifndef DG_H
+#define DG_H
+
+#include "stack_u64.h"
+
+typedef struct {
+  size_t n;
+  stack_u64 *nbrs;
+} dg_t;
+
+void dg_init(dg_t *g, const size_t n);
+void dg_clear(dg_t *g);
+void dg_add_edge(dg_t *g, const size_t v, const size_t w);
+
+#endif
diff --git a/utils/dict.c b/utils/dict.c
@@ -0,0 +1,111 @@
+#include "dict.h"
+
+/*
+static inline void stack_ptr_init(stack_ptr *d) {
+  d->nmemb = 0;
+  d->alloc = DICT_DEFAULT_STACK_SIZE;
+
+  d->data = calloc(d->alloc, sizeof(*(d->data)));
+}
+*/
+
+static inline void stack_ptr_init_size(stack_ptr *d, const size_t alloc) {
+  d->nmemb = 0;
+  d->alloc = alloc;
+
+  d->data = calloc(d->alloc, sizeof(*(d->data)));
+}
+
+static inline void stack_ptr_clear(stack_ptr *d) {
+  d->nmemb = 0;
+  free(d->data);
+  d->data = NULL;
+}
+
+static inline void stack_ptr_push(stack_ptr *d, void *x) {
+  if (d->alloc <= d->nmemb) {
+    d->alloc <<= 1;
+    d->data = realloc(d->data, d->alloc * sizeof(*(d->data)));
+  }
+
+  d->data[d->nmemb] = x;
+  d->nmemb++;
+}
+
+/*
+static inline void* stack_ptr_get(const stack_ptr *d, const size_t i) {
+  return d->data[i];
+}
+
+
+static inline void* stack_ptr_getlast(const stack_ptr *d) {
+  return stack_ptr_get(d, d->nmemb - 1);
+}
+
+
+static inline void* stack_ptr_pop(stack_ptr *d) {
+  if (d->nmemb == 0)
+    return STACK_PTR_EMPTY_POP;
+  void* r = stack_ptr_getlast(d);
+  d->nmemb--;
+  return r;
+}
+*/
+
+void dict_init_size(dict_t *d, const size_t alloc) {
+  d->nalloc = alloc;
+  d->nelts = 0;
+  d->keys = calloc(d->nalloc, sizeof(*d->keys));
+  d->values = calloc(d->nalloc, sizeof(*d->values));
+
+  size_t i;
+  for (i = 0; i < d->nalloc; i++) {
+    stack_sd_init_size(&d->keys[i], DICT_DEFAULT_STACK_SIZE);
+    stack_ptr_init_size(&d->values[i], DICT_DEFAULT_STACK_SIZE);
+  }
+}
+
+void dict_init(dict_t *d) { dict_init_size(d, DICT_DEFAULT_SIZE); }
+
+void dict_clear(dict_t *d) {
+  size_t i;
+  for (i = 0; i < d->nalloc; i++) {
+    stack_sd_clear(&d->keys[i]);
+    stack_ptr_clear(&d->values[i]);
+  }
+
+  d->nalloc = 0;
+  d->nelts = 0;
+  free(d->keys);
+  free(d->values);
+  d->keys = NULL;
+  d->values = NULL;
+}
+
+void *dict_lookup(dict_t *d, sd k) {
+  uint64_t h = sd_hash(&k);
+  size_t i = h % d->nalloc;
+  int stack_idx = stack_sd_lookup(&d->keys[i], k);
+
+  if (stack_idx == STACK_SD_LOOKUP_NOT_FOUND) {
+    return NULL;
+  }
+
+  return (d->values[i]).data[stack_idx];
+}
+
+#include <stdio.h>
+
+void dict_insert(dict_t *d, sd k, void *value) {
+  uint64_t h = sd_hash(&k);
+  size_t i = h % d->nalloc;
+  int stack_idx = stack_sd_lookup(&d->keys[i], k);
+
+  if (stack_idx == STACK_SD_LOOKUP_NOT_FOUND) {
+    stack_sd_push(&(d->keys[i]), k);
+    stack_ptr_push(&(d->values[i]), value);
+    d->nelts++;
+  } else {
+    (d->values[i]).data[stack_idx] = value;
+  }
+}
diff --git a/utils/dict.h b/utils/dict.h
@@ -0,0 +1,33 @@
+#ifndef DICT_H
+#define DICT_H
+
+#include "stack_sd.h"
+
+#define DICT_DEFAULT_SIZE 255
+#define DICT_DEFAULT_STACK_SIZE 2
+#define STACK_PTR_EMPTY_POP (NULL)
+#define DICT_LOOKUP_NOT_FOUND (STACK_SD_LOOKUP_NOT_FOUND) // == -1
+
+typedef struct {
+  size_t nmemb;
+  size_t alloc;
+
+  void **data;
+} stack_ptr;
+
+typedef struct {
+  size_t nelts;
+  size_t nalloc;
+
+  stack_sd *keys;
+  stack_ptr *values;
+} dict_t;
+
+void dict_init_size(dict_t *d, const size_t alloc);
+void dict_init(dict_t *d);
+void dict_clear(dict_t *d);
+void *dict_lookup(dict_t *d, sd k);
+void dict_insert(dict_t *t, sd k, void *v);
+void print_dict(dict_t *d);
+
+#endif
diff --git a/utils/fheap.c b/utils/fheap.c
@@ -0,0 +1,249 @@
+#include "fheap.h"
+
+void fnode_init(fnode_t *node, const uint64_t value, void *data) {
+  node->children = NULL;
+  node->parent = NULL;
+  node->left = node;
+  node->right = node;
+  node->nchildren = 0;
+  node->marked = 0;
+
+  node->value = value;
+  node->data = data;
+}
+
+void fnode_clear(fnode_t *node) {
+  // clear children recursively
+  fnode_t *c, *d;
+  size_t n = node->nchildren;
+  c = node->children;
+  size_t i;
+  for (i = 0; i < n; i++) {
+    d = c->right;
+    fnode_clear(c);
+    c = d;
+  }
+
+  free(node);
+}
+
+void fheap_init(fheap_t *heap) {
+  heap->min = NULL;
+  heap->head = NULL;
+  heap->n = 0;
+}
+
+void fheap_clear(fheap_t *heap) {
+  fnode_t *c = heap->head;
+  fnode_t *d = c->right;
+
+  while (d != c) {
+    fnode_t *t = d->right;
+    fnode_clear(d);
+    d = t;
+  }
+  fnode_clear(c);
+
+  heap->min = NULL;
+  heap->head = NULL;
+  heap->n = 0;
+}
+
+static inline void insert_leftof(fnode_t *x, fnode_t *y) {
+  fnode_t *x_left = x->left;
+  x->left = y;
+  y->parent = x->parent;
+  y->right = x;
+  y->left = x_left;
+  x_left->right = y;
+}
+
+fnode_t *fheap_insert(fheap_t *heap, const uint64_t value, void *data) {
+  fnode_t *nnode = malloc(sizeof(*nnode));
+
+  fnode_init(nnode, value, data);
+
+  if (heap->min == NULL) {
+    heap->head = nnode;
+    heap->min = nnode;
+  } else {
+    insert_leftof(heap->head, nnode);
+    if (nnode->value < (heap->min)->value) {
+      heap->min = nnode;
+    }
+  }
+
+  heap->n++;
+
+  return nnode;
+}
+
+static inline void remove_node(fnode_t *x) {
+  (x->left)->right = x->right;
+  (x->right)->left = x->left;
+}
+
+static inline void fheap_link(fheap_t *heap, fnode_t *y, fnode_t *x) {
+  remove_node(y);
+  if (heap->head == y)
+    heap->head = y->right;
+  if (x->children != NULL) {
+    insert_leftof(x->children, y);
+  } else {
+    x->children = y;
+    y->parent = x;
+    y->left = y;
+    y->right = y;
+    x->nchildren = 0;
+  }
+  x->nchildren++;
+  y->marked = 0;
+}
+
+static inline void consolidate(fheap_t *heap) {
+  size_t i, deg;
+  fnode_t *a[heap->n];
+
+  for (i = 0; i < heap->n; i++)
+    a[i] = NULL;
+
+  fnode_t *c = heap->head;
+  fnode_t *head_list[heap->n];
+  size_t nheads = 0;
+  do {
+    head_list[nheads] = c;
+    nheads++;
+    c = c->right;
+  } while (c != heap->head);
+
+  size_t max_deg = 0;
+
+  fnode_t *x, *y;
+  for (i = 0; i < nheads; i++) {
+    c = head_list[i];
+
+    deg = c->nchildren;
+    x = c;
+    while (a[deg] != NULL) {
+      if (x->value > a[deg]->value) {
+        y = x;
+        x = a[deg];
+      } else {
+        y = a[deg];
+      }
+
+      fheap_link(heap, y, x);
+
+      a[deg] = NULL;
+      deg++;
+    }
+
+    a[deg] = x;
+
+    if (deg > max_deg)
+      max_deg = deg;
+  }
+
+  heap->head = NULL;
+  heap->min = NULL;
+  for (i = 0; i < max_deg + 1; i++) {
+    if (a[i] != NULL) {
+      if (heap->head == NULL) {
+        heap->head = a[i];
+        heap->min = a[i];
+        a[i]->left = a[i];
+        a[i]->right = a[i];
+      } else {
+        insert_leftof(heap->head, a[i]);
+        if (a[i]->value < (heap->min)->value)
+          heap->min = a[i];
+      }
+    }
+  }
+}
+
+fnode_t *fheap_extract_min_node(fheap_t *heap) {
+  fnode_t *z = heap->min;
+  fnode_t *c, *d;
+  if (z != NULL) {
+    if (z->nchildren > 0) {
+      c = z->children;
+      do {
+        d = c->right;
+        c->parent = NULL;
+        insert_leftof(heap->head, c);
+        c = d;
+      } while (c != z->children);
+      z->children = NULL;
+    }
+
+    remove_node(z);
+
+    if (z == z->right) {
+      heap->min = NULL;
+      heap->head = NULL;
+    } else {
+      heap->min = z->right;
+      if (heap->head == z)
+        heap->head = z->right;
+      consolidate(heap);
+    }
+
+    heap->n--;
+  }
+
+  return z;
+}
+
+uint64_t fheap_extract_min(void **data, fheap_t *heap) {
+  fnode_t *z = fheap_extract_min_node(heap);
+
+  uint64_t value = z->value;
+  *data = z->data;
+
+  z->nchildren = 0;
+  z->children = NULL;
+  fnode_clear(z);
+
+  return value;
+}
+
+static inline void fheap_cut(fheap_t *heap, fnode_t *x, fnode_t *y) {
+  remove_node(x);
+  if (y->children == x) {
+    if (x->right == x) {
+      y->children = NULL;
+    } else {
+      y->children = x->right;
+    }
+  }
+  y->nchildren--;
+
+  insert_leftof(heap->head, x);
+  x->parent = NULL;
+  x->marked = 0;
+}
+
+static void fheap_cascading_cut(fheap_t *heap, fnode_t *y) {
+  fnode_t *z = y->parent;
+  if (z != NULL) {
+    if (y->marked == 0) {
+      y->marked = 1;
+    } else {
+      fheap_cut(heap, y, z);
+      fheap_cascading_cut(heap, z);
+    }
+  }
+}
+
+void fheap_decrease_value(fheap_t *heap, fnode_t *node, const uint64_t value) {
+  node->value = value;
+  fnode_t *y = node->parent;
+  if (y != NULL && node->value < y->value) {
+    fheap_cut(heap, node, y);
+    fheap_cascading_cut(heap, y);
+  }
+
+  if (node->value < (heap->min)->value)
+    heap->min = node;
+}
diff --git a/utils/fheap.h b/utils/fheap.h
@@ -0,0 +1,40 @@
+#ifndef FHEAP_H
+#define FHEAP_H
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct fnode_struct {
+  uint64_t value;
+  void *data;
+
+  struct fnode_struct *parent;
+  struct fnode_struct *children;
+  size_t nchildren;
+  uint64_t marked;
+
+  struct fnode_struct *left;
+  struct fnode_struct *right;
+} fnode_t;
+
+typedef struct {
+  size_t n;
+  fnode_t *min;
+  fnode_t *head;
+} fheap_t;
+
+void fnode_init(fnode_t *node, const uint64_t value, void *data);
+void fnode_clear(fnode_t *node);
+
+void fheap_init(fheap_t *heap);
+void fheap_clear(fheap_t *heap);
+
+fnode_t *fheap_insert(fheap_t *heap, const uint64_t value, void *data);
+fnode_t *fheap_extract_min_node(fheap_t *heap);
+uint64_t fheap_extract_min(void **data, fheap_t *heap);
+
+void fheap_decrease_value(fheap_t *heap, fnode_t *node, const uint64_t value);
+
+#endif
diff --git a/utils/graph.c b/utils/graph.c
@@ -0,0 +1,22 @@
+#include "graph.h"
+
+void graph_init(graph_t *g, const size_t n) {
+  g->n = n;
+  g->nbrs = malloc(n * sizeof(*(g->nbrs)));
+
+  size_t i;
+  for (i = 0; i < n; i++)
+    stack_u64_init(&g->nbrs[i]);
+}
+
+void graph_clear(graph_t *g) {
+  size_t i;
+  for (i = 0; i < g->n; i++)
+    stack_u64_clear(&g->nbrs[i]);
+  free(g->nbrs);
+}
+
+void graph_add_edge(graph_t *g, const size_t v, const size_t w) {
+  stack_u64_push(&g->nbrs[v], w);
+  stack_u64_push(&g->nbrs[w], v);
+}
diff --git a/utils/graph.h b/utils/graph.h
@@ -0,0 +1,15 @@
+#ifndef GRAPH_H
+#define GRAPH_H
+
+#include "stack_u64.h"
+
+typedef struct {
+  size_t n;
+  stack_u64 *nbrs;
+} graph_t;
+
+void graph_init(graph_t *g, const size_t n);
+void graph_clear(graph_t *g);
+void graph_add_edge(graph_t *g, const size_t v, const size_t w);
+
+#endif
diff --git a/utils/ht.c b/utils/ht.c
@@ -0,0 +1,40 @@
+#include "ht.h"
+
+void ht_init_size(ht *t, const size_t alloc) {
+  t->nalloc = alloc;
+  t->nelts = 0;
+  t->entries = calloc(t->nalloc, sizeof(*t->entries));
+
+  size_t i;
+  for (i = 0; i < t->nalloc; i++)
+    stack_sd_init_size(&t->entries[i], HT_DEFAULT_STACK_SIZE);
+}
+
+void ht_init(ht *t) { ht_init_size(t, HT_DEFAULT_SIZE); }
+
+void ht_clear(ht *t) {
+  size_t i;
+  for (i = 0; i < t->nalloc; i++)
+    stack_sd_clear(&t->entries[i]);
+
+  t->nalloc = 0;
+  t->nelts = 0;
+  free(t->entries);
+  t->entries = NULL;
+}
+
+int ht_lookup(ht *t, sd d) {
+  uint64_t h = sd_hash(&d);
+  size_t i = h % t->nalloc;
+  return stack_sd_lookup(&t->entries[i], d);
+}
+
+void ht_insert(ht *t, sd d) {
+  if (ht_lookup(t, d) != STACK_SD_LOOKUP_NOT_FOUND)
+    return;
+
+  size_t i = sd_hash(&d) % t->nalloc;
+  stack_sd_push(&t->entries[i], d);
+
+  t->nelts++;
+}
diff --git a/utils/ht.h b/utils/ht.h
@@ -0,0 +1,73 @@
+#ifndef HT_H
+#define HT_H
+
+#include "stack_sd.h"
+
+#define HT_DEFAULT_SIZE 255
+#define HT_DEFAULT_STACK_SIZE 2
+#define HT_LOOKUP_NOT_FOUND (STACK_SD_LOOKUP_NOT_FOUND) // == -1
+
+typedef struct {
+  size_t nelts;
+  size_t nalloc;
+
+  stack_sd *entries;
+} ht;
+
+/**
+ * Intitialize a hash table.
+ *
+ * This initializes a hash table of <<alloc>> buckets, at the address
+ * pointed to by <<t>>. Note that this memory needs to be cleared.
+ *
+ * @param t pointer to the ht to be initialized
+ * @param alloc the number of buckets to allocate for
+ */
+void ht_init_size(ht *t, const size_t alloc);
+
+/**
+ * Initialize a hash table.
+ *
+ * This initializes a hash table of the default size which is
+ * HT_DEFAULT_SIZE number of buckets. Note that this allocates memory
+ * that needs to be ht_clear'd.
+ *
+ * @param t pointer to the th to initialized
+ */
+void ht_init(ht *t);
+
+/**
+ * Clear a stack.
+ *
+ * @param t the stack to clear
+ */
+void ht_clear(ht *t);
+
+/**
+ * Lookup a sd in the hashtable.
+ *
+ * Returns a nonnegative value if the sd is in the hash table (by value
+ * comparison rather than pointer comparison of data). The value is the
+ * index of the stack_sd in the hash bucket where the sd is found. If
+ * the sd cannot be found in the stack the value
+ *   HT_LOOKUP_NOT_FOUND == -1
+ * is returned.
+ *
+ * @param t pointer to the hash table too look up in
+ * @param d the sd to look up
+ */
+int ht_lookup(ht *t, sd d);
+
+/**
+ * Insert a as into the hashtable.
+ *
+ * Inserts a sd into the hash table. Note that this does not copy the
+ * sd data, but only pushes the pointer onto the stack. The sd should
+ * therefore not be cleared until ht has been cleared.
+ *
+ * @param t pointer to the hash table to insert into
+ * @param d the sd to insert
+ */
+void ht_insert(ht *t, sd d);
+
+#endif
diff --git a/utils/play/Makefile b/utils/play/Makefile
@@ -0,0 +1,30 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+LDFLAGS=-lcunit -L/usr/local/lib
+
+OBJS=\
+  ../reading.o \
+	../stack_u64.o \
+  ../wdg.o \
+	../fheap.o
+
+all: utils tests
+
+utils:
+	make -C ../
+
+tests: tests.c $(TEST_OBJS)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o tests tests.c $(OBJS)
+	./tests
+
+.c.o:
+	$(CC) $(CFLAGS) -c $<
+
+clean:
+	rm -rf tests $(TEST_OBJS)
diff --git a/utils/play/tests.c b/utils/play/tests.c
@@ -0,0 +1,38 @@
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "../fheap.h"
+
+int main() {
+  fheap_t heap;
+
+  fheap_init(&heap);
+
+  uint64_t data[4] = {1, 2, 3, 4};
+  uint64_t ddata;
+
+  fheap_insert(&heap, 3, &(data[0]));
+  fheap_insert(&heap, 7, &(data[1]));
+  fheap_insert(&heap, 13, &(data[2]));
+  fheap_insert(&heap, 0, &(data[3]));
+
+  fheap_print(&heap);
+
+  void *pdata;
+  ddata = fheap_extract_min(&pdata, &heap);
+  printf("[+] extracted (%llu) with value %llu\n", *(uint64_t *)pdata, ddata);
+  fheap_print(&heap);
+
+  ddata = fheap_extract_min(&pdata, &heap);
+  printf("[+] extracted (%llu) with value %llu\n", *(uint64_t *)pdata, ddata);
+  fheap_print(&heap);
+
+  ddata = fheap_extract_min(&pdata, &heap);
+  printf("[+] extracted (%llu) with value %llu\n", *(uint64_t *)pdata, ddata);
+  fheap_print(&heap);
+
+  ddata = fheap_extract_min(&pdata, &heap);
+  printf("[+] extracted (%llu) with value %llu\n", *(uint64_t *)pdata, ddata);
+  fheap_print(&heap);
+}
diff --git a/utils/reading.c b/utils/reading.c
@@ -0,0 +1,158 @@
+#include "reading.h"
+
+size_t readall(char **output, char *filename) {
+  FILE *f = NULL;
+
+  f = fopen(filename, "r");
+
+  if (f == NULL) {
+    perror("Error when opening file");
+    exit(EXIT_FAILURE);
+  }
+
+  char buffer[MAXIMUM_FILESIZE_BYTES];
+  size_t read_size = fread(buffer, 1, MAXIMUM_FILESIZE_BYTES, f);
+
+  if (read_size == MAXIMUM_FILESIZE_BYTES) {
+    perror("File is to big?!");
+    exit(EXIT_FAILURE);
+  }
+
+  *output = (char *)malloc(read_size + 1);
+  memcpy(*output, buffer, read_size);
+  (*output)[read_size] = '\0';
+
+  return read_size;
+}
+
+size_t readlines(char ***lines, char *filename) {
+  FILE *f = fopen(filename, "r");
+
+  if (f == NULL) {
+    perror("Error when opening file");
+    exit(EXIT_FAILURE);
+  }
+
+  size_t tl_nalloc = LINES_ALLOC_MIN;
+  size_t ntl = 0;
+  char **tl = calloc(tl_nalloc, sizeof(*tl));
+
+  char line_buffer[MAXIMUM_LINE_BYTES];
+  while (fgets(line_buffer, MAXIMUM_LINE_BYTES, f)) {
+    if (ntl == tl_nalloc) {
+      tl_nalloc <<= 1;
+      tl = realloc(tl, tl_nalloc * sizeof(*tl));
+    }
+
+    tl[ntl] = strdup(line_buffer);
+
+    ntl++;
+  }
+
+  tl = realloc(tl, ntl * sizeof(*tl));
+  *lines = tl;
+
+  return (ntl);
+}
+
+int read_next_u64(uint64_t *n, FILE *fp) {
+  int r, c = 0;
+
+  // skip to next numerical char
+  while ((r = fgetc(fp)) != EOF) {
+    if ((int)'0' <= r && r <= (int)'9')
+      break;
+  }
+  if (r == EOF)
+    return EOF;
+
+  // read an unsigned int
+  *n = (uint64_t)(r - (int)'0');
+  c++;
+  while ((r = fgetc(fp)) != EOF) {
+    if ((int)'0' <= r && r <= (int)'9') {
+      *n = (*n) * 10UL + (uint64_t)(r - (int)'0');
+      c++;
+    } else {
+      break;
+    }
+  }
+
+  return c;
+}
+
+char *sread_next_u64(uint64_t *n, char *s) {
+  char *fc = s;
+
+  // skip to next numerical char
+  while (*fc != '\0') {
+    if ('0' <= *fc && *fc <= '9')
+      break;
+    fc++;
+  }
+  if (*fc == '\0')
+    return NULL;
+
+  // read an unsigned int
+  *n = (uint64_t)(*fc - '0');
+  fc++;
+  while (*fc != EOF) {
+    if ('0' <= *fc && *fc <= '9') {
+      *n = (*n) * 10UL + (uint64_t)(*fc - '0');
+    } else {
+      break;
+    }
+    fc++;
+  }
+
+  if (*fc == '\0')
+    return NULL;
+
+  return fc;
+}
+
+char *sread_next_i64(int64_t *n, char *s) {
+  char *fc = s;
+
+  // skip to the next numerival char or -
+  while (*fc != '\0') {
+    if (('0' <= *fc && *fc <= '9') || *fc == '-')
+      break;
+    fc++;
+  }
+  if (*fc == '\0')
+    return NULL;
+
+  // -1 if starts with '-', otherwise +1
+  int64_t sign = 1;
+  if (*fc == '-') {
+    sign = -1;
+    fc++;
+    // if no following digit this is interpreted as -0 == 0.
+    if (*fc < '0' || *fc > '9') {
+      *n = 0;
+      if (*fc == '\0')
+        return NULL;
+      return fc;
+    }
+  }
+
+  // read an unsigned int, starts with digit
+  *n = (int64_t)(*fc - '0');
+  fc++;
+  while (*fc != EOF) {
+    if ('0' <= *fc && *fc <= '9') {
+      *n = (*n) * 10L + (int64_t)(*fc - '0');
+    } else {
+      break;
+    }
+    fc++;
+  }
+  // apply sign
+  *n *= sign;
+
+  if (*fc == '\0')
+    return NULL;
+
+  return fc;
+}
diff --git a/utils/reading.h b/utils/reading.h
@@ -0,0 +1,82 @@
+#ifndef READING_H
+#define READING_H
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAXIMUM_FILESIZE_BYTES 256000
+#define MAXIMUM_LINE_BYTES 256000
+#define LINES_ALLOC_MIN 2048
+
+/**
+ * Read all chars from a file.
+ *
+ * Reads an entire file (assuming its size is < MAXIMUM_FILESIZE_BYTES).
+ * This allocates memory that needs to be free'd.
+ *
+ * @param output pointer to the address where the allocated string
+ *   should be written
+ * @param filename the name of the file
+ * @return the number of bytes read (excluding final null byte)
+ */
+size_t readall(char **output, char *filename);
+
+/**
+ * Read all lines from a file.
+ *
+ * Reads a file, line-by-line (assuming no line is longer than
+ * MAXIMUM_LINE_BYTES).
+ * Allocates memory for each line that needs to be free'd.
+ *
+ * @param lines pointer to the address where the list of pointers
+ *   should be written
+ * @param filename the name of the file
+ * @return the number of lines read
+ */
+size_t readlines(char ***lines, char *filename);
+
+/**
+ * Read the next uint64_t from FILE ptr.
+ *
+ * This has no checks for overflows, if it doesnt fit it will have
+ * undefined behaviour. Returns EOF if EOF is found before any
+ * uints.
+ *
+ * @param n pointer to where to write result
+ * @param fp file pointer to read from
+ * @returns the number of characters read as part of u64
+ */
+int read_next_u64(uint64_t *n, FILE *fp);
+
+/**
+ * Read the next uin64_t from string.
+ *
+ * This assumes that the string is a well-formatted null-terminated
+ * string. Returns a pointer to the * first char after the uint64 in
+ * the string, or NULL if this is not a part of the string or if it
+ * failed to read an uint64_t.
+ *
+ * @param n pointer to where to write the result
+ * @param s the string
+ * @returns pointer to next char in string, or NULL
+ */
+char *sread_next_u64(uint64_t *n, char *s);
+
+/**
+ * Read the next int64_t from string.
+ *
+ * This assumes that the string is a well-formatted null-terminated
+ * string. Returns a pointer to the first char after the uint64 in
+ * the string, or NULL if this is not a part of the string or if it
+ * failed to read an int64_t. Substrings '-' that are not followed
+ * by a digit are interpreted as 0.
+ *
+ * @param n pointer to where to write the result
+ * @param s the string
+ * @returns pointer to next char in string, or NULL
+ */
+char *sread_next_i64(int64_t *n, char *s);
+
+#endif
diff --git a/utils/sd.c b/utils/sd.c
@@ -0,0 +1,60 @@
+#include "sd.h"
+
+void sd_init(sd *s, const size_t size) {
+  s->size = size;
+  s->data = malloc(s->size);
+}
+
+void sd_clear(sd *s) {
+  s->size = 0;
+  free(s->data);
+}
+
+static inline uint64_t murmur_u64(uint64_t h) {
+  h ^= h >> 33;
+  h *= 0xff51afd7ed558ccdL;
+  h ^= h >> 33;
+  h *= 0xc4ceb9fe1a85ec53L;
+  h ^= h >> 33;
+  return h;
+}
+
+uint64_t sd_hash(sd *s) {
+  uint64_t tmp = s->size;
+
+  size_t i;
+  for (i = 0; i < s->size; i++) {
+    tmp ^= ((uint64_t)s->data[i]) << (i % 4);
+  }
+
+  return murmur_u64(tmp);
+}
+
+int sd_cmp(sd *x, sd *y) {
+  if (x->size < y->size) {
+    return -1;
+  } else if (x->size > y->size) {
+    return 1;
+  }
+
+  return memcmp(x->data, y->data, x->size);
+}
+
+void sd_init_u64(sd *s, const uint64_t x) {
+  sd_init(s, sizeof(x));
+  memcpy(s->data, &x, sizeof(x));
+}
+
+uint64_t sd_conv_u64(sd *s) {
+  uint64_t r;
+  memcpy(&r, s->data, sizeof(r));
+  return r;
+}
+
+void sd_init_str(sd *s, const char *str) {
+  size_t len = strlen(str) + 1;
+  sd_init(s, sizeof(*str) * len);
+  memcpy(s->data, str, len);
+}
+
+char *sd_get_str(sd *s) { return (char *)s->data; }
diff --git a/utils/sd.h b/utils/sd.h
@@ -0,0 +1,103 @@
+#ifndef SD_H
+#define SD_H
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct {
+  size_t size;
+  uint8_t *data;
+} sd;
+
+/**
+ * Initialise a sized data.
+ *
+ * Allocates memory that needs to be sd_clear'd.
+ *
+ * @param s pointer where to write the sized data obj
+ * @param size number of bytes in the sd
+ */
+void sd_init(sd *s, const size_t size);
+
+/**
+ * Clear a sd.
+ *
+ * @param s pointer to the sd
+ */
+void sd_clear(sd *s);
+
+/**
+ * Computes a hash of a sd.
+ *
+ * This hash is a simple combination of xoring
+ * in all the bytes to a uint64_t in different
+ * positions, then computing the mix64 function
+ * known as murmur64.
+ *
+ * @param s the sd to get hash of
+ * @return hash of s
+ */
+uint64_t sd_hash(sd *s);
+
+/**
+ * Compare two sds.
+ *
+ * Compares the sd's pointed to by x and y. In the
+ * following sense: a < b if either a.size < b.size
+ * or a.data < b.data (in the memcmp order). If
+ * the sd are equal then 0 is returned.
+ *
+ * @param x pointer to first sd
+ * @param y pointer to second sd
+ * @return comparison number (lex order)
+ */
+int sd_cmp(sd *x, sd *y);
+
+/**
+ * Initialises a sd from a uint64_t.
+ *
+ * The size will be 8 bytes, and the order of the
+ * bytes is raw (host order). Allocates memory that
+ * needs to be sd_clear'd.
+ *
+ * @param s ptr to the sd to initialise
+ * @param x the uint64_t to initialize from
+ */
+void sd_init_u64(sd *s, const uint64_t x);
+
+/**
+ * Converts a sd to a uint64_t.
+ *
+ * Gets a uint64_t from a sd that has been created
+ * by sd_init_u64.
+ *
+ * @param s ptr to the sd to convert
+ * @return the uint64_t
+ */
+uint64_t sd_conv_u64(sd *s);
+
+/**
+ * Initializes a sd from a string.
+ *
+ * Copies a string into a sd, including the
+ * terminating null byte. Allocates memory that
+ * needs to be sd_clear'd.
+ *
+ * @param s ptr to the sd to be init'd
+ * @param str the string to copy into new sd
+ */
+void sd_init_str(sd *s, const char *str);
+
+/**
+ * Get string stored in sd.
+ *
+ * This returns a char* to the data stored in the
+ * sd. This assumes that the data is in fact a
+ * null terminated string.
+ *
+ * @param s ptr to the sd to get string from
+ */
+char *sd_get_str(sd *s);
+
+#endif
diff --git a/utils/set_u64.c b/utils/set_u64.c
@@ -0,0 +1,70 @@
+#include "set_u64.h"
+
+void set_u64_init_size(set_u64_t *s, const size_t size) {
+  size_t i;
+  s->nalloc = size;
+  s->nelts = 0;
+
+  s->head = malloc((s->nalloc) * sizeof(*(s->head)));
+
+  for (i = 0; i < s->nalloc; i++)
+    LIST_INIT(&(s->head[i]));
+}
+
+void set_u64_init(set_u64_t *s) { set_u64_init_size(s, SET_U64_DEFAULT_SIZE); }
+
+void set_u64_clear(set_u64_t *s) {
+  size_t i;
+  struct list_entry *n1;
+
+  for (i = 0; i < s->nalloc; i++) {
+    while (!LIST_EMPTY(&(s->head[i]))) {
+      n1 = LIST_FIRST(&(s->head[i]));
+      LIST_REMOVE(n1, entries);
+      free(n1);
+    }
+  }
+
+  free(s->head);
+  s->head = NULL;
+  s->nalloc = 0;
+  s->nelts = 0;
+}
+
+static inline size_t u64_hash(const uint64_t c) { return (size_t)c; }
+
+static inline le_t *list_lookup(struct listhead h, uint64_t v) {
+  le_t *np;
+  LIST_FOREACH(np, &h, entries) {
+    if (np->value == v)
+      return np;
+  }
+
+  return NULL;
+}
+
+size_t set_u64_lookup(le_t *r, set_u64_t *s, uint64_t v) {
+  size_t i = u64_hash(v) % s->nalloc;
+  le_t *elt = list_lookup(s->head[i], v);
+
+  if (elt != NULL) {
+    *r = *elt;
+    return i;
+  }
+
+  return SIZE_MAX;
+}
+
+int set_u64_insert(set_u64_t *s, uint64_t v) {
+  size_t i = u64_hash(v) % s->nalloc;
+
+  if (list_lookup(s->head[i], v) == NULL) {
+    le_t *new = malloc(sizeof(*new));
+    new->value = v;
+    LIST_INSERT_HEAD(&(s->head[i]), new, entries);
+    s->nelts++;
+    return 1;
+  }
+
+  return 0;
+}
diff --git a/utils/set_u64.h b/utils/set_u64.h
@@ -0,0 +1,28 @@
+#ifndef SET_U64_H
+#define SET_U64_H
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <sys/queue.h>
+
+#define SET_U64_DEFAULT_SIZE (255)
+
+typedef struct list_entry {
+  uint64_t value;
+  LIST_ENTRY(list_entry) entries;
+} le_t;
+
+typedef struct {
+  size_t nelts;
+  size_t nalloc;
+
+  LIST_HEAD(listhead, list_entry) * head;
+} set_u64_t;
+
+void set_u64_init_size(set_u64_t *s, const size_t size);
+void set_u64_init(set_u64_t *s);
+void set_u64_clear(set_u64_t *s);
+size_t set_u64_lookup(le_t *r, set_u64_t *s, uint64_t v);
+int set_u64_insert(set_u64_t *s, uint64_t v);
+
+#endif
diff --git a/utils/set_u64p.c b/utils/set_u64p.c
@@ -0,0 +1,75 @@
+#include "set_u64p.h"
+
+void set_u64p_init_size(set_u64p_t *s, const size_t size) {
+  size_t i;
+  s->nalloc = size;
+  s->nelts = 0;
+
+  s->head = malloc((s->nalloc) * sizeof(*(s->head)));
+
+  for (i = 0; i < s->nalloc; i++)
+    LIST_INIT(&(s->head[i]));
+}
+
+void set_u64p_init(set_u64p_t *s) {
+  set_u64p_init_size(s, SET_U64_DEFAULT_SIZE);
+}
+
+void set_u64p_clear(set_u64p_t *s) {
+  size_t i;
+  struct list_entry *n1;
+
+  for (i = 0; i < s->nalloc; i++) {
+    while (!LIST_EMPTY(&(s->head[i]))) {
+      n1 = LIST_FIRST(&(s->head[i]));
+      LIST_REMOVE(n1, entries);
+      free(n1);
+    }
+  }
+
+  free(s->head);
+  s->head = NULL;
+  s->nalloc = 0;
+  s->nelts = 0;
+}
+
+static inline size_t u64p_hash(const uint64_t *pair) {
+  return (size_t)(pair[0] ^ pair[1]);
+}
+
+static inline le_t *list_lookup(struct lh_u64p h, uint64_t *pair) {
+  le_t *np;
+  LIST_FOREACH(np, &h, entries) {
+    if (np->v[0] == pair[0] && np->v[1] == pair[1])
+      return np;
+  }
+
+  return NULL;
+}
+
+size_t set_u64p_lookup(le_t *r, set_u64p_t *s, uint64_t *pair) {
+  size_t i = u64p_hash(pair) % s->nalloc;
+  le_t *elt = list_lookup(s->head[i], pair);
+
+  if (elt != NULL) {
+    *r = *elt;
+    return i;
+  }
+
+  return SIZE_MAX;
+}
+
+int set_u64p_insert(set_u64p_t *s, uint64_t *pair) {
+  size_t i = u64p_hash(pair) % s->nalloc;
+
+  if (list_lookup(s->head[i], pair) == NULL) {
+    le_t *new = malloc(sizeof(*new));
+    new->v[0] = pair[0];
+    new->v[1] = pair[1];
+    LIST_INSERT_HEAD(&(s->head[i]), new, entries);
+    s->nelts++;
+    return 1;
+  }
+
+  return 0;
+}
diff --git a/utils/set_u64p.h b/utils/set_u64p.h
@@ -0,0 +1,28 @@
+#ifndef SET_U64P_H
+#define SET_U64P_H
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <sys/queue.h>
+
+#define SET_U64_DEFAULT_SIZE (255)
+
+typedef struct list_entry {
+  uint64_t v[2];
+  LIST_ENTRY(list_entry) entries;
+} le_t;
+
+typedef struct {
+  size_t nelts;
+  size_t nalloc;
+
+  LIST_HEAD(lh_u64p, list_entry) * head;
+} set_u64p_t;
+
+void set_u64p_init_size(set_u64p_t *s, const size_t size);
+void set_u64p_init(set_u64p_t *s);
+void set_u64p_clear(set_u64p_t *s);
+size_t set_u64p_lookup(le_t *r, set_u64p_t *s, uint64_t *pair);
+int set_u64p_insert(set_u64p_t *s, uint64_t *pair);
+
+#endif
diff --git a/utils/smallset.c b/utils/smallset.c
@@ -0,0 +1,100 @@
+#include "smallset.h"
+
+#define BIDX(x) (x / 8)
+#define BMSK(x) (0x80 >> (x % 8))
+#define SIZE(b) ((b + 7) >> 3)
+
+void smallset_init(smallset *s, const size_t bits) {
+  s->bits = bits;
+  s->data = calloc(SIZE(bits), sizeof(*s->data));
+  assert(sizeof(*s->data) == 1);
+}
+
+void smallset_clear(smallset *s) {
+  s->bits = 0;
+  free(s->data);
+}
+
+void smallset_insert(smallset *s, const uint64_t x) {
+  assert(x < s->bits);
+  s->data[BIDX(x)] |= BMSK(x);
+}
+
+int smallset_lookup(smallset *s, const uint64_t x) {
+  assert(x < s->bits);
+  return s->data[BIDX(x)] & BMSK(x);
+}
+
+void smallset_intersection(smallset *out, smallset *a, smallset *b) {
+  assert(a->bits == b->bits);
+  assert(out->bits == a->bits);
+
+  size_t i;
+  for (i = 0; i < SIZE(out->bits); i++) {
+    out->data[i] = a->data[i] & b->data[i];
+  }
+}
+
+void smallset_minus(smallset *out, smallset *a, smallset *b) {
+  assert(a->bits == b->bits);
+  assert(out->bits == a->bits);
+
+  size_t i;
+  for (i = 0; i < SIZE(out->bits); i++) {
+    out->data[i] = a->data[i] - (a->data[i] & b->data[i]);
+  }
+}
+
+void smallset_tonstr(char *str, size_t n, smallset *s) {
+  int first = 1;
+  int u = snprintf(str, n, "{");
+
+  size_t i;
+  for (i = 0; i < s->bits; i++) {
+    if (smallset_lookup(s, i)) {
+      if (!first) {
+        u += snprintf(&str[u], n - u, ", %zu", i);
+      } else {
+        u += snprintf(&str[u], n - u, "%zu", i);
+        first = !first;
+      }
+    }
+  }
+
+  snprintf(&str[u], n - u, "}");
+}
+
+uint64_t smallset_getone(smallset *s) {
+  uint64_t i;
+  for (i = 0; i < s->bits; i++) {
+    if (smallset_lookup(s, i))
+      return i;
+  }
+
+  return SMALLSET_IS_EMPTY;
+}
+
+void smallset_empty(smallset *s) { memset(s->data, 0, SIZE(s->bits)); }
+
+uint64_t smallset_cardinality(smallset *s) {
+  uint64_t a;
+  uint64_t r = 0;
+  size_t i;
+  for (i = 0; i < SIZE(s->bits) - 8; i += 8) {
+    __asm__ volatile("POPCNT %1, %0"
+                     : "=r"(a)
+                     : "r"(*((uint64_t *)&s->data[i]))
+                     :);
+    r += a;
+  }
+
+  uint64_t tmp = 0;
+  while (i < SIZE(s->bits)) {
+    tmp = (tmp << 8) ^ ((uint64_t)s->data[i]);
+    i++;
+  }
+  __asm__ volatile("POPCNT %1, %0" : "=r"(a) : "r"(tmp) :);
+  r += a;
+
+  return r;
+}
diff --git a/utils/smallset.h b/utils/smallset.h
@@ -0,0 +1,132 @@
+/**
+ * Implementation of "small sets" (subsets of [n], where n is not big).
+ */
+#ifndef SMALLSET_H_
+#define SMALLSET_H_
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define SMALLSET_IS_EMPTY UINT64_MAX
+
+typedef struct {
+  size_t bits;
+  uint8_t *data;
+} smallset;
+
+/**
+ * Intializes a small set.
+ *
+ * The set is a subset of some fixed [n].
+ * Allocates memory that needs to be smallset_clear'd.
+ *
+ * @param s pointer to the smallset to be inited
+ * @param bits specifies that the set is a subset of [bits]
+ */
+void smallset_init(smallset *s, const size_t bits);
+
+/**
+ * Clears a set.
+ *
+ * @param s pointer to the smallset to clear
+ */
+void smallset_clear(smallset *s);
+
+/**
+ * Insert an element into a set.
+ *
+ * Inserts an element x \in [n] into a smallset. If the
+ * element is already in the set the set is unchanged.
+ * Assertions will fail of x \not\in [n].
+ *
+ * @param s pointer to the set to insert into
+ * @param x element to insert into the set
+ */
+void smallset_insert(smallset *s, const uint64_t x);
+
+/**
+ * Check if an element is in a set.
+ *
+ * Checks if the element x is in the set pointed to by
+ * s. Assumes that x \in [n] (or assertions will fail).
+ *
+ * @param s pointer to the set to check in
+ * @param x the element to check for
+ * @returns a nonzero value iff x is in the set
+ */
+int smallset_lookup(smallset *s, const uint64_t x);
+
+/**
+ * Compute the intersection of two sets.
+ *
+ * This assumes that all three sets are subsets of the
+ * same [n]. Otherwise assertions will fail. Note that
+ * any of the pointers are allowed to be equal.
+ *
+ * @param out pointer to the set where to write intersection
+ * @param a pointer to one of the intersect sets
+ * @param b pointer to the other intersect set
+ */
+void smallset_intersection(smallset *out, smallset *a, smallset *b);
+
+/**
+ * Compute the set subtraction of two sets.
+ *
+ * This assumes that all three sets are subsets of the
+ * same [n]. Otherwise assertions will fail. Note that
+ * any of the pointers are allowed to be equal.
+ *
+ * @param out pointer to the set where to write difference
+ * @param a pointer to set to subtract from
+ * @param b pointer to set to subtract
+ */
+void smallset_minus(smallset *out, smallset *a, smallset *b);
+
+/**
+ * Writes the smallset to a string.
+ *
+ * The string buffer must already be allocated, and the
+ * parameter n indicates the maximum number of bytes that
+ * may be written to the buffer, including termingating \0.
+ *
+ * String is reprensented in trad notation: e.g.
+ *   {}, {1,3}, {0,16,19}
+ *
+ * @param str pointer to the first char of the write buffer
+ * @param n limit on the number of bytes to be written
+ * @param s pointer to the smallset
+ */
+void smallset_tonstr(char *str, size_t n, smallset *s);
+
+/**
+ * Get an element that is in the set.
+ *
+ * Returns the smallest element from the set. If no element
+ * is in the set (i.e. it is empty) then this returns the
+ * SMALLSET_IS_EMPTY value (== UINT64_MAX).
+ *
+ * @param s pointer to the smallset to get elem from
+ */
+uint64_t smallset_getone(smallset *s);
+
+/**
+ * Empty a set.
+ *
+ * Empties a set by removing all elements.
+ *
+ * @param s pointer to the smallset to empty
+ */
+void smallset_empty(smallset *s);
+
+/**
+ * Get the cardinality of a set.
+ *
+ * @param s the set to get the cardinality of
+ * @return the cardinality
+ */
+uint64_t smallset_cardinality(smallset *s);
+
+#endif
diff --git a/utils/stack_sd.c b/utils/stack_sd.c
@@ -0,0 +1,53 @@
+#include "stack_sd.h"
+
+void stack_sd_init(stack_sd *d) {
+  d->nmemb = 0;
+  d->alloc = BASE_STACK_SD_SIZE;
+
+  d->data = calloc(d->alloc, sizeof(*(d->data)));
+}
+
+void stack_sd_init_size(stack_sd *d, const size_t size) {
+  d->nmemb = 0;
+  d->alloc = size;
+
+  d->data = calloc(d->alloc, sizeof(*(d->data)));
+}
+
+void stack_sd_clear(stack_sd *d) {
+  d->nmemb = 0;
+  free(d->data);
+  d->data = NULL;
+}
+
+void stack_sd_push(stack_sd *d, sd x) {
+  if (d->alloc <= d->nmemb) {
+    d->alloc <<= 1;
+    d->data = realloc(d->data, d->alloc * sizeof(*(d->data)));
+  }
+
+  d->data[d->nmemb] = x;
+  d->nmemb++;
+}
+
+sd stack_sd_get(const stack_sd *d, const size_t i) { return d->data[i]; }
+
+sd stack_sd_getlast(const stack_sd *d) { return stack_sd_get(d, d->nmemb - 1); }
+
+sd stack_sd_pop(stack_sd *d) {
+  if (d->nmemb == 0)
+    return STACK_SD_EMPTY_POP;
+
+  sd r = stack_sd_getlast(d);
+  d->nmemb--;
+  return r;
+}
+
+int stack_sd_lookup(stack_sd *d, sd s) {
+  size_t i;
+  for (i = 0; i < d->nmemb; i++) {
+    if (sd_cmp(&d->data[i], &s) == 0)
+      return i;
+  }
+  return STACK_SD_LOOKUP_NOT_FOUND;
+}
diff --git a/utils/stack_sd.h b/utils/stack_sd.h
@@ -0,0 +1,97 @@
+#ifndef STACK_SD_H
+#define STACK_SD_H
+
+#include "sd.h"
+#include <stdint.h>
+#include <stdlib.h>
+
+#define BASE_STACK_SD_SIZE 256
+#define STACK_SD_LOOKUP_NOT_FOUND (-1)
+#define STACK_SD_EMPTY_POP ((sd){.size = 0, .data = NULL})
+
+typedef struct {
+  size_t nmemb;
+  size_t alloc;
+
+  sd *data;
+} stack_sd;
+
+/**
+ * Initialization of stack.
+ *
+ * Initialises memory for the stack. Use clear.
+ *
+ * @param d pointer to the address where to write the new stack
+ */
+void stack_sd_init(stack_sd *d);
+
+/**
+ * Initialization of stack, with size.
+ *
+ * Initialises memory for the stack. Use clear.
+ *
+ * @param d pointer to the address where to write the new stack
+ * @param size initial size of stack alloc
+ */
+void stack_sd_init_size(stack_sd *d, const size_t size);
+
+/**
+ * Clear a stack
+ *
+ * @param d pointer to the stack to clear
+ */
+void stack_sd_clear(stack_sd *d);
+
+/**
+ * Pushes a sd pointer onto the stack.
+ *
+ * Note that this does not copy the sd data, it just pushes the sd
+ * struct including the pointer to the stack.
+ *
+ * @param d pointer to the stack
+ * @param x the sd to push
+ */
+void stack_sd_push(stack_sd *d, sd x);
+
+/**
+ * Gets the element at index i in the stack.
+ *
+ * @param d pointer to the stack
+ * @param i the index to get element at
+ * @return the value of the sd at index i
+ */
+sd stack_sd_get(const stack_sd *d, const size_t i);
+
+/**
+ * Get the last (top) element of a stack.
+ *
+ * @param d pointer to the stack
+ * @return the value of the sd at the top
+ */
+sd stack_sd_getlast(const stack_sd *d);
+
+/**
+ * Pop an element of the stack.
+ *
+ * Note that popping never decreases the amount of memory allocated.
+ * If memory is an issue the stacks have to be destroyed and replaced.
+ * Returns STACK_SD_POP_EMPY if stack is empty.
+ *
+ * @param d pointer to the stack
+ * @return the value of the popped sd
+ */
+sd stack_sd_pop(stack_sd *d);
+
+/**
+ * Lookup a sd on a stack.
+ *
+ * Returns the first index on the stack at which a sd appears. Returns
+ * STACK_SD_LOOKUP_NOT_FOUND (== -1) if element is not in stack. It
+ * compares the sd elements (i.e. not only the pointers).
+ *
+ * @param d the stack to lookup in
+ * @param s the sd to look for in the stack
+ */
+int stack_sd_lookup(stack_sd *d, sd s);
+
+#endif
diff --git a/utils/stack_str.c b/utils/stack_str.c
@@ -0,0 +1,38 @@
+#include "stack_str.h"
+
+void stack_str_init(stack_str *d) {
+  d->nmemb = 0;
+  d->alloc = BASE_STACK_STR_SIZE;
+
+  d->data = calloc(d->alloc, sizeof(*(d->data)));
+}
+
+void stack_str_clear(stack_str *d) {
+  d->nmemb = 0;
+  free(d->data);
+  d->data = NULL;
+}
+
+void stack_str_push(stack_str *d, char *x) {
+  if (d->alloc <= d->nmemb) {
+    d->alloc <<= 1;
+    d->data = realloc(d->data, d->alloc * sizeof(*(d->data)));
+  }
+
+  d->data[d->nmemb] = x;
+  d->nmemb++;
+}
+
+char *stack_str_get(const stack_str *d, const size_t i) { return d->data[i]; }
+
+char *stack_str_getlast(const stack_str *d) {
+  return stack_str_get(d, d->nmemb - 1);
+}
+
+char *stack_str_pop(stack_str *d) {
+  if (d->nmemb == 0)
+    return STACK_STR_EMPTY_POP;
+  char *r = stack_str_getlast(d);
+  d->nmemb--;
+  return r;
+}
diff --git a/utils/stack_str.h b/utils/stack_str.h
@@ -0,0 +1,70 @@
+#ifndef STACK_STR_H
+#define STACK_STR_H
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#define BASE_STACK_STR_SIZE 256
+#define STACK_STR_EMPTY_POP (NULL)
+
+typedef struct {
+  size_t nmemb;
+  size_t alloc;
+
+  char **data;
+} stack_str;
+
+/**
+ * Initialization of stack.
+ *
+ * Initialises memory for the stack. Use clear.
+ *
+ * @param d pointer to the address where to write the new stack
+ */
+void stack_str_init(stack_str *d);
+
+/**
+ * Clear a stack
+ *
+ * @param d pointer to the stack to clear
+ */
+void stack_str_clear(stack_str *d);
+
+/**
+ * Pushes a string (char pointer) onto the stack.
+ *
+ * Note that this does not copy the string, it just pushes the pointer to the
+ * stack.
+ *
+ * @param d pointer to the stack
+ * @param x the string (char pointer) to push
+ */
+void stack_str_push(stack_str *d, char *x);
+
+/**
+ * Gets the element at index i in the stack.
+ *
+ * @param d pointer to the stack
+ * @param i the index to get element at
+ * @return the value (the char pointer) of the element at index i
+ */
+char *stack_str_get(const stack_str *d, const size_t i);
+
+/**
+ * Get the last (top) element of a stack.
+ *
+ * @param d pointer to the stack
+ */
+char *stack_str_getlast(const stack_str *d);
+
+/**
+ * Pop an element of the stack.
+ *
+ * Note that popping never decreases the amount of memory allocated.
+ * If memory is an issue the stacks have to be destroyed and replaced.
+ *
+ * @param d pointer to the stack
+ */
+char *stack_str_pop(stack_str *d);
+
+#endif
diff --git a/utils/stack_u64.c b/utils/stack_u64.c
@@ -0,0 +1,40 @@
+#include "stack_u64.h"
+
+void stack_u64_init(stack_u64 *d) {
+  d->nmemb = 0;
+  d->alloc = BASE_STACK_SIZE;
+
+  d->data = calloc(d->alloc, sizeof(*(d->data)));
+}
+
+void stack_u64_clear(stack_u64 *d) {
+  d->nmemb = 0;
+  free(d->data);
+  d->data = NULL;
+}
+
+void stack_u64_push(stack_u64 *d, const uint64_t x) {
+  if (d->alloc <= d->nmemb) {
+    d->alloc <<= 1;
+    d->data = realloc(d->data, d->alloc * sizeof(*(d->data)));
+  }
+
+  d->data[d->nmemb] = x;
+  d->nmemb++;
+}
+
+uint64_t stack_u64_get(const stack_u64 *d, const size_t i) {
+  return d->data[i];
+}
+
+uint64_t stack_u64_getlast(const stack_u64 *d) {
+  return stack_u64_get(d, d->nmemb - 1);
+}
+
+uint64_t stack_u64_pop(stack_u64 *d) {
+  if (d->nmemb == 0)
+    return STACK_U64_EMPTY_POP;
+  uint64_t r = stack_u64_getlast(d);
+  d->nmemb--;
+  return r;
+}
diff --git a/utils/stack_u64.h b/utils/stack_u64.h
@@ -0,0 +1,67 @@
+#ifndef STACK_U64_H
+#define STACK_U64_H
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#define BASE_STACK_SIZE 256
+#define STACK_U64_EMPTY_POP UINT64_MAX
+
+typedef struct {
+  size_t nmemb;
+  size_t alloc;
+
+  uint64_t *data;
+} stack_u64;
+
+/**
+ * Initialization of stack.
+ *
+ * Initialises memory for the stack. Use clear.
+ *
+ * @param d pointer to the address where to write the new stack
+ */
+void stack_u64_init(stack_u64 *d);
+
+/**
+ * Clear a stack
+ *
+ * @param d pointer to the stack to clear
+ */
+void stack_u64_clear(stack_u64 *d);
+
+/**
+ * Pushes a uint64_t onto the stack.
+ *
+ * @param d pointer to the stack
+ * @param x the uint64_t to push
+ */
+void stack_u64_push(stack_u64 *d, const uint64_t x);
+
+/**
+ * Gets the element at index i in the stack.
+ *
+ * @param d pointer to the stack
+ * @param i the index to get element at
+ * @return the value of the element at index i
+ */
+uint64_t stack_u64_get(const stack_u64 *d, const size_t i);
+
+/**
+ * Get the last (top) element of a stack.
+ *
+ * @param d pointer to the stack
+ */
+uint64_t stack_u64_getlast(const stack_u64 *d);
+
+/**
+ * Pop an element of the stack.
+ *
+ * Note that popping never decreases the amount of memory allocated.
+ * If memory is an issue the stacks have to be destroyed and replaced.
+ *
+ * @param d pointer to the stack
+ */
+uint64_t stack_u64_pop(stack_u64 *d);
+
+#endif
diff --git a/utils/test/Makefile b/utils/test/Makefile
@@ -0,0 +1,43 @@
+CC=clang
+CFLAGS+=-std=c99 -pedantic -Wall -Werror -Wstrict-prototypes
+CFLAGS+=-Wmissing-prototypes -Wmissing-declarations -Wshadow
+CFLAGS+=-Wpointer-arith -Wcast-qual -Wsign-compare
+CFLAGS+=-O2 -g
+CFLAGS+=-fstack-protector-all -Wtype-limits -fno-common
+CFLAGS+=-fno-builtin
+CFLAGS+=-I/usr/local/include
+LDFLAGS=-lcunit -L/usr/local/lib
+
+TEST_OBJS=\
+  test_reading.o \
+  test_stack_u64.o \
+  test_stack_str.o \
+	test_sd.o \
+	test_smallset.o \
+	test_stack_sd.o \
+	test_ht.o \
+	test_set_u64.o
+OBJS=\
+  ../reading.o \
+	../stack_u64.o \
+  ../stack_str.o \
+  ../sd.o \
+	../smallset.o \
+	../stack_sd.o \
+	../ht.o \
+	../set_u64.o
+
+all: utils tests
+
+utils:
+	make -C ../
+
+tests: tests.c $(TEST_OBJS)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o tests tests.c $(OBJS) $(TEST_OBJS)
+	./tests
+
+.c.o:
+	$(CC) $(CFLAGS) -c $<
+
+clean:
+	rm -rf tests $(TEST_OBJS)
diff --git a/utils/test/test_ht.c b/utils/test/test_ht.c
@@ -0,0 +1,75 @@
+#include "test_ht.h"
+
+void test_ht_init() {
+  ht h;
+
+  ht_init(&h);
+  CU_ASSERT(h.nelts == 0);
+  CU_ASSERT(h.nalloc == HT_DEFAULT_SIZE);
+  CU_ASSERT(h.entries != NULL);
+
+  ht_clear(&h);
+
+  ht_init_size(&h, 23);
+  CU_ASSERT(h.nelts == 0);
+  CU_ASSERT(h.nalloc == 23);
+  CU_ASSERT(h.entries != NULL);
+
+  ht_clear(&h);
+}
+
+void test_ht_insert() {
+  ht h;
+  ht_init_size(&h, 16);
+
+  sd elts[17];
+
+  size_t i;
+  for (i = 0; i < 17; i++) {
+    sd_init_u64(&elts[i], i);
+    ht_insert(&h, elts[i]);
+    CU_ASSERT(h.nelts == i + 1);
+  }
+
+  sd tmp;
+  sd_init_u64(&tmp, 12);
+  ht_insert(&h, tmp);
+  CU_ASSERT(h.nelts == 17);
+
+  for (i = 0; i < 17; i++)
+    sd_clear(&elts[i]);
+
+  ht_clear(&h);
+}
+
+void test_ht_lookup() {
+  ht h;
+  ht_init_size(&h, 32);
+
+  sd elts[17];
+
+  size_t i;
+  for (i = 0; i < 17; i++) {
+    sd_init_u64(&elts[i], 2 * i);
+    ht_insert(&h, elts[i]);
+  }
+
+  sd nelts[2 * 17];
+  for (i = 0; i < 2 * 17; i++) {
+    sd_init_u64(&nelts[i], i);
+    if (i % 2 == 0) {
+      int index = ht_lookup(&h, nelts[i]);
+      CU_ASSERT(index <= 17);
+      CU_ASSERT(index >= 0);
+    } else {
+      CU_ASSERT(ht_lookup(&h, nelts[i]) == HT_LOOKUP_NOT_FOUND);
+    }
+  }
+
+  for (i = 0; i < 17; i++)
+    sd_clear(&elts[i]);
+  for (i = 0; i < 2 * 17; i++)
+    sd_clear(&nelts[i]);
+
+  ht_clear(&h);
+}
diff --git a/utils/test/test_ht.h b/utils/test/test_ht.h
@@ -0,0 +1,11 @@
+#ifndef TEST_HT_H
+#define TEST_HT_H
+
+#include "../ht.h"
+#include <CUnit/Basic.h>
+
+void test_ht_init(void);
+void test_ht_lookup(void);
+void test_ht_insert(void);
+
+#endif
diff --git a/utils/test/test_reading.c b/utils/test/test_reading.c
@@ -0,0 +1,61 @@
+#include "test_reading.h"
+
+void test_reading_readall() {
+  char *read;
+  size_t n = readall(&read, "testfile1.txt");
+
+  CU_ASSERT(n == 49);
+  CU_ASSERT(
+      strcmp(read, "Hello, this is a test file.\nIt contains two rows.") == 0);
+
+  free(read);
+}
+
+void test_reading_readlines() {
+  char **read;
+  size_t n = readlines(&read, "testfile1.txt");
+
+  CU_ASSERT(n == 2);
+  CU_ASSERT(strcmp(read[0], "Hello, this is a test file.\n") == 0);
+  CU_ASSERT(strcmp(read[1], "It contains two rows.") == 0);
+
+  size_t i;
+  for (i = 0; i < n; i++)
+    free(read[i]);
+  free(read);
+}
+
+void test_reading_read_next_u64() {
+  FILE *fp = fopen("testfile2.txt", "r");
+
+  uint64_t r;
+  CU_ASSERT(read_next_u64(&r, fp) == 4);
+  CU_ASSERT(r == 4711);
+  CU_ASSERT(read_next_u64(&r, fp) == 2);
+  CU_ASSERT(r == 65);
+  CU_ASSERT(read_next_u64(&r, fp) == 4);
+  CU_ASSERT(r == 1337);
+  CU_ASSERT(read_next_u64(&r, fp) == 1);
+  CU_ASSERT(r == 1);
+  CU_ASSERT(read_next_u64(&r, fp) == 1);
+  CU_ASSERT(r == 0);
+
+  fclose(fp);
+}
+
+void test_reading_sread_next_u64() {
+  char tst[] = "foobarm4711asd65,1337.1\n0";
+  char *n = tst;
+  uint64_t r;
+
+  CU_ASSERT((n = sread_next_u64(&r, n)) != NULL);
+  CU_ASSERT(r == 4711);
+  CU_ASSERT((n = sread_next_u64(&r, n)) != NULL);
+  CU_ASSERT(r == 65);
+  CU_ASSERT((n = sread_next_u64(&r, n)) != NULL);
+  CU_ASSERT(r == 1337);
+  CU_ASSERT((n = sread_next_u64(&r, n)) != NULL);
+  CU_ASSERT(r == 1);
+  CU_ASSERT((n = sread_next_u64(&r, n)) == NULL);
+  CU_ASSERT(r == 0);
+}
diff --git a/utils/test/test_reading.h b/utils/test/test_reading.h
@@ -0,0 +1,12 @@
+#ifndef TEST_READING_H
+#define TEST_READING_H
+
+#include "../reading.h"
+#include <CUnit/Basic.h>
+
+void test_reading_readall(void);
+void test_reading_readlines(void);
+void test_reading_read_next_u64(void);
+void test_reading_sread_next_u64(void);
+
+#endif
diff --git a/utils/test/test_sd.c b/utils/test/test_sd.c
@@ -0,0 +1,93 @@
+#include "test_sd.h"
+
+void test_sd_init() {
+  sd s;
+  sd_init(&s, 12);
+
+  CU_ASSERT(s.size == 12);
+
+  size_t i;
+  for (i = 0; i < s.size; i++)
+    s.data[i] = 0x00;
+  for (i = 0; i < s.size; i++) {
+    CU_ASSERT(s.data[i] == 0x00);
+  }
+
+  sd_clear(&s);
+
+  sd_init_u64(&s, 13);
+  uint64_t tretton = 13;
+  CU_ASSERT(s.size == sizeof(uint64_t));
+  CU_ASSERT(memcmp(s.data, &tretton, sizeof(uint64_t)) == 0);
+
+  sd_clear(&s);
+
+  char *mystr = "this is a test";
+  sd_init_str(&s, mystr);
+  CU_ASSERT(s.size == strlen(mystr) + 1);
+  CU_ASSERT(memcmp(s.data, "this is a test", s.size) == 0);
+
+  sd_clear(&s);
+}
+
+void test_sd_cmp() {
+  char *strs[4] = {"bc", "abc", "abd", "abcd"};
+
+  sd ss[4];
+  size_t i;
+  for (i = 0; i < 4; i++) {
+    sd_init_str(&ss[i], strs[i]);
+  }
+
+  CU_ASSERT(sd_cmp(&ss[0], &ss[1]) < 0);
+  CU_ASSERT(sd_cmp(&ss[0], &ss[2]) < 0);
+  CU_ASSERT(sd_cmp(&ss[0], &ss[3]) < 0);
+  CU_ASSERT(sd_cmp(&ss[0], &ss[0]) == 0);
+  CU_ASSERT(sd_cmp(&ss[1], &ss[2]) < 0);
+  CU_ASSERT(sd_cmp(&ss[1], &ss[3]) < 0);
+  CU_ASSERT(sd_cmp(&ss[3], &ss[2]) > 0);
+
+  for (i = 0; i < 4; i++) {
+    sd_clear(&ss[i]);
+  }
+}
+
+void test_sd_hash() {
+  char *strs[4] = {"bc", "abc", "abd", "abd"};
+
+  sd ss[4];
+  size_t i;
+  for (i = 0; i < 4; i++) {
+    sd_init_str(&ss[i], strs[i]);
+  }
+
+  CU_ASSERT(sd_hash(&ss[0]) != sd_hash(&ss[1]));
+  CU_ASSERT(sd_hash(&ss[0]) != sd_hash(&ss[2]));
+  CU_ASSERT(sd_hash(&ss[0]) != sd_hash(&ss[3]));
+  CU_ASSERT(sd_hash(&ss[1]) != sd_hash(&ss[2]));
+  CU_ASSERT(sd_hash(&ss[1]) != sd_hash(&ss[3]));
+  CU_ASSERT(sd_hash(&ss[2]) == sd_hash(&ss[3]));
+
+  for (i = 0; i < 4; i++)
+    sd_clear(&ss[i]);
+}
+
+void test_sd_conv_u64() {
+  sd s;
+  sd_init_u64(&s, 0xdeadbeeffeedbaaf);
+  uint64_t c = sd_conv_u64(&s);
+  CU_ASSERT(c == 0xdeadbeeffeedbaaf);
+  sd_clear(&s);
+}
+
+void test_sd_get_str() {
+  sd s;
+  char *str = "hello world!";
+  sd_init_str(&s, str);
+  char *mystr = sd_get_str(&s);
+
+  CU_ASSERT(mystr != str);
+  CU_ASSERT(strncmp(str, mystr, 13) == 0);
+
+  sd_clear(&s);
+}
diff --git a/utils/test/test_sd.h b/utils/test/test_sd.h
@@ -0,0 +1,13 @@
+#ifndef TEST_SD_H
+#define TEST_SD_H
+
+#include "../sd.h"
+#include <CUnit/Basic.h>
+
+void test_sd_init(void);
+void test_sd_cmp(void);
+void test_sd_hash(void);
+void test_sd_conv_u64(void);
+void test_sd_get_str(void);
+
+#endif
diff --git a/utils/test/test_set_u64.c b/utils/test/test_set_u64.c
@@ -0,0 +1,19 @@
+#include "test_set_u64.h"
+
+void test_set_u64_init() {
+  set_u64_t s;
+
+  set_u64_init(&s);
+  CU_ASSERT(s.nelts == 0);
+  CU_ASSERT(s.nalloc == SET_U64_DEFAULT_SIZE);
+  CU_ASSERT(LIST_EMPTY(&(s.head[0])));
+
+  set_u64_clear(&s);
+
+  set_u64_init_size(&s, 23);
+  CU_ASSERT(s.nelts == 0);
+  CU_ASSERT(s.nalloc == 23);
+  CU_ASSERT(LIST_EMPTY(&(s.head[0])));
+
+  set_u64_clear(&s);
+}
diff --git a/utils/test/test_set_u64.h b/utils/test/test_set_u64.h
@@ -0,0 +1,9 @@
+#ifndef TEST_SET_U64_H
+#define TEST_SET_U64_H
+
+#include "../set_u64.h"
+#include <CUnit/Basic.h>
+
+void test_set_u64_init(void);
+
+#endif
diff --git a/utils/test/test_smallset.c b/utils/test/test_smallset.c
@@ -0,0 +1,207 @@
+#include "test_smallset.h"
+
+void test_smallset_init() {
+  smallset s;
+  smallset_init(&s, 17);
+
+  size_t i;
+  for (i = 0; i < (17 + 7) / 8; i++) {
+    CU_ASSERT(s.data[i] == 0);
+  }
+
+  smallset_clear(&s);
+}
+
+void test_smallset_insert() {
+  smallset s;
+  smallset_init(&s, 17);
+
+  smallset_insert(&s, 3);
+
+  CU_ASSERT(s.data[0] == 0x80 >> 3);
+  CU_ASSERT(s.data[1] == 0x00);
+  CU_ASSERT(s.data[2] == 0x00);
+
+  smallset_clear(&s);
+}
+
+void test_smallset_lookup() {
+  smallset s;
+  smallset_init(&s, 17);
+
+  smallset_insert(&s, 3);
+  smallset_insert(&s, 15);
+  smallset_insert(&s, 4);
+
+  CU_ASSERT(smallset_lookup(&s, 0) == 0);
+  CU_ASSERT(smallset_lookup(&s, 1) == 0);
+  CU_ASSERT(smallset_lookup(&s, 2) == 0);
+  CU_ASSERT(smallset_lookup(&s, 3) != 0);
+  CU_ASSERT(smallset_lookup(&s, 4) != 0);
+  CU_ASSERT(smallset_lookup(&s, 5) == 0);
+  CU_ASSERT(smallset_lookup(&s, 6) == 0);
+  CU_ASSERT(smallset_lookup(&s, 7) == 0);
+  CU_ASSERT(smallset_lookup(&s, 8) == 0);
+  CU_ASSERT(smallset_lookup(&s, 9) == 0);
+  CU_ASSERT(smallset_lookup(&s, 10) == 0);
+  CU_ASSERT(smallset_lookup(&s, 11) == 0);
+  CU_ASSERT(smallset_lookup(&s, 12) == 0);
+  CU_ASSERT(smallset_lookup(&s, 13) == 0);
+  CU_ASSERT(smallset_lookup(&s, 14) == 0);
+  CU_ASSERT(smallset_lookup(&s, 15) != 0);
+  CU_ASSERT(smallset_lookup(&s, 16) == 0);
+
+  smallset_clear(&s);
+}
+
+void test_smallset_intersection() {
+  smallset a, b, s;
+  smallset_init(&a, 17);
+  smallset_init(&b, 17);
+  smallset_init(&s, 17);
+
+  smallset_insert(&a, 3);
+  smallset_insert(&a, 4);
+  smallset_insert(&a, 15);
+  smallset_insert(&a, 5);
+  smallset_insert(&a, 7);
+
+  smallset_insert(&b, 3);
+  smallset_insert(&b, 4);
+  smallset_insert(&b, 15);
+  smallset_insert(&b, 6);
+  smallset_insert(&b, 9);
+  smallset_insert(&b, 10);
+
+  smallset_intersection(&s, &a, &b);
+
+  CU_ASSERT(smallset_lookup(&s, 0) == 0);
+  CU_ASSERT(smallset_lookup(&s, 1) == 0);
+  CU_ASSERT(smallset_lookup(&s, 2) == 0);
+  CU_ASSERT(smallset_lookup(&s, 3) != 0);
+  CU_ASSERT(smallset_lookup(&s, 4) != 0);
+  CU_ASSERT(smallset_lookup(&s, 5) == 0);
+  CU_ASSERT(smallset_lookup(&s, 6) == 0);
+  CU_ASSERT(smallset_lookup(&s, 7) == 0);
+  CU_ASSERT(smallset_lookup(&s, 8) == 0);
+  CU_ASSERT(smallset_lookup(&s, 9) == 0);
+  CU_ASSERT(smallset_lookup(&s, 10) == 0);
+  CU_ASSERT(smallset_lookup(&s, 11) == 0);
+  CU_ASSERT(smallset_lookup(&s, 12) == 0);
+  CU_ASSERT(smallset_lookup(&s, 13) == 0);
+  CU_ASSERT(smallset_lookup(&s, 14) == 0);
+  CU_ASSERT(smallset_lookup(&s, 15) != 0);
+  CU_ASSERT(smallset_lookup(&s, 16) == 0);
+
+  smallset_clear(&s);
+}
+
+void test_smallset_minus() {
+  smallset a, b, s;
+  smallset_init(&a, 17);
+  smallset_init(&b, 17);
+  smallset_init(&s, 17);
+
+  smallset_insert(&a, 3);
+  smallset_insert(&a, 4);
+  smallset_insert(&a, 15);
+  smallset_insert(&a, 5);
+  smallset_insert(&a, 7);
+
+  smallset_insert(&b, 3);
+  smallset_insert(&b, 4);
+  smallset_insert(&b, 15);
+  smallset_insert(&b, 6);
+  smallset_insert(&b, 9);
+  smallset_insert(&b, 10);
+
+  smallset_minus(&s, &a, &b);
+
+  CU_ASSERT(smallset_lookup(&s, 0) == 0);
+  CU_ASSERT(smallset_lookup(&s, 1) == 0);
+  CU_ASSERT(smallset_lookup(&s, 2) == 0);
+  CU_ASSERT(smallset_lookup(&s, 3) == 0);
+  CU_ASSERT(smallset_lookup(&s, 4) == 0);
+  CU_ASSERT(smallset_lookup(&s, 5) != 0);
+  CU_ASSERT(smallset_lookup(&s, 6) == 0);
+  CU_ASSERT(smallset_lookup(&s, 7) != 0);
+  CU_ASSERT(smallset_lookup(&s, 8) == 0);
+  CU_ASSERT(smallset_lookup(&s, 9) == 0);
+  CU_ASSERT(smallset_lookup(&s, 10) == 0);
+  CU_ASSERT(smallset_lookup(&s, 11) == 0);
+  CU_ASSERT(smallset_lookup(&s, 12) == 0);
+  CU_ASSERT(smallset_lookup(&s, 13) == 0);
+  CU_ASSERT(smallset_lookup(&s, 14) == 0);
+  CU_ASSERT(smallset_lookup(&s, 15) == 0);
+  CU_ASSERT(smallset_lookup(&s, 16) == 0);
+
+  smallset_clear(&s);
+}
+
+void test_smallset_tonstr() {
+  smallset s;
+  smallset_init(&s, 25);
+
+  char buffer[256];
+
+  smallset_tonstr(buffer, 256, &s);
+  CU_ASSERT(strncmp(buffer, "{}", 2) == 0);
+
+  smallset_insert(&s, 1);
+  smallset_tonstr(buffer, 256, &s);
+  CU_ASSERT(strncmp(buffer, "{1}", 3) == 0);
+
+  smallset_insert(&s, 12);
+  smallset_tonstr(buffer, 256, &s);
+  CU_ASSERT(strncmp(buffer, "{1, 12}", 6) == 0);
+
+  smallset_clear(&s);
+}
+
+void test_smallset_getone() {
+  smallset s;
+  smallset_init(&s, 17);
+
+  CU_ASSERT(smallset_getone(&s) == SMALLSET_IS_EMPTY);
+
+  smallset_insert(&s, 3);
+  smallset_insert(&s, 15);
+  smallset_insert(&s, 4);
+
+  CU_ASSERT(smallset_getone(&s) == 3);
+
+  smallset_clear(&s);
+}
+
+void test_smallset_empty() {
+  smallset s;
+  smallset_init(&s, 17);
+
+  CU_ASSERT(smallset_getone(&s) == SMALLSET_IS_EMPTY);
+
+  smallset_insert(&s, 3);
+  smallset_insert(&s, 15);
+  smallset_insert(&s, 4);
+
+  CU_ASSERT(smallset_getone(&s) == 3);
+
+  smallset_empty(&s);
+
+  CU_ASSERT(smallset_getone(&s) == SMALLSET_IS_EMPTY);
+
+  smallset_clear(&s);
+}
+
+void test_smallset_cardinality() {
+  smallset s;
+  smallset_init(&s, 7 * 50);
+
+  uint64_t i, j;
+  for (i = 0; i < 50; i++) {
+    for (j = 0; j < 7; j++) {
+      smallset_insert(&s, i * 7 + j);
+    }
+    CU_ASSERT(smallset_cardinality(&s) == 7 * (i + 1));
+  }
+  smallset_clear(&s);
+}
diff --git a/utils/test/test_smallset.h b/utils/test/test_smallset.h
@@ -0,0 +1,17 @@
+#ifndef TEST_SMALLSET_H
+#define TEST_SMALLSET_H
+
+#include "../smallset.h"
+#include <CUnit/Basic.h>
+
+void test_smallset_init(void);
+void test_smallset_insert(void);
+void test_smallset_lookup(void);
+void test_smallset_intersection(void);
+void test_smallset_minus(void);
+void test_smallset_tonstr(void);
+void test_smallset_getone(void);
+void test_smallset_empty(void);
+void test_smallset_cardinality(void);
+
+#endif
diff --git a/utils/test/test_stack_sd.c b/utils/test/test_stack_sd.c
@@ -0,0 +1,140 @@
+#include "test_stack_sd.h"
+
+void test_stack_sd_init() {
+  stack_sd s;
+  stack_sd_init(&s);
+
+  CU_ASSERT(s.nmemb == 0);
+  CU_ASSERT(s.alloc == BASE_STACK_SD_SIZE);
+  CU_ASSERT(s.data != NULL);
+
+  stack_sd_clear(&s);
+
+  stack_sd_init_size(&s, 4);
+
+  CU_ASSERT(s.nmemb == 0);
+  CU_ASSERT(s.alloc == 4);
+  CU_ASSERT(s.data != NULL);
+
+  stack_sd_clear(&s);
+}
+
+void test_stack_sd_push() {
+  stack_sd s;
+  stack_sd_init_size(&s, 4);
+
+  sd topush[5];
+  size_t i;
+  for (i = 0; i < 5; i++) {
+    sd_init_u64(&topush[i], i);
+    stack_sd_push(&s, topush[i]);
+
+    CU_ASSERT(s.nmemb == i + 1);
+  }
+  CU_ASSERT(s.nmemb == 5);
+  CU_ASSERT(s.alloc == 8);
+
+  CU_ASSERT(memcmp(s.data, topush, sizeof(*topush) * 5) == 0);
+
+  for (i = 0; i < 5; i++)
+    sd_clear(&topush[i]);
+  stack_sd_clear(&s);
+}
+
+void test_stack_sd_get() {
+  stack_sd s;
+  stack_sd_init(&s);
+
+  sd topush[20];
+  size_t i;
+  for (i = 0; i < 20; i++) {
+    sd_init_u64(&topush[i], i);
+    stack_sd_push(&s, topush[i]);
+  }
+
+  sd tmp;
+  for (i = 0; i < 20; i++) {
+    tmp = stack_sd_get(&s, i);
+    CU_ASSERT(tmp.size == topush[i].size);
+    CU_ASSERT(tmp.data == topush[i].data);
+  }
+
+  for (i = 0; i < 5; i++)
+    sd_clear(&topush[i]);
+  stack_sd_clear(&s);
+}
+
+void test_stack_sd_getlast() {
+  stack_sd s;
+  stack_sd_init_size(&s, 8);
+
+  sd topush[20];
+  size_t i;
+  for (i = 0; i < 20; i++) {
+    sd_init_u64(&topush[i], i);
+    stack_sd_push(&s, topush[i]);
+  }
+
+  sd tmp = stack_sd_getlast(&s);
+  CU_ASSERT(tmp.size == topush[19].size);
+  CU_ASSERT(tmp.data == topush[19].data);
+
+  for (i = 0; i < 5; i++)
+    sd_clear(&topush[i]);
+  stack_sd_clear(&s);
+}
+
+void test_stack_sd_pop() {
+  stack_sd s;
+  stack_sd_init_size(&s, 8);
+
+  sd topush[20];
+  size_t i;
+  for (i = 0; i < 20; i++) {
+    sd_init_u64(&topush[i], i);
+    stack_sd_push(&s, topush[i]);
+  }
+
+  sd tmp;
+  for (i = 0; i < 20; i++) {
+    tmp = stack_sd_pop(&s);
+    CU_ASSERT(tmp.size == topush[19 - i].size);
+    CU_ASSERT(tmp.data == topush[19 - i].data);
+  }
+
+  tmp = stack_sd_pop(&s);
+  CU_ASSERT(tmp.size == STACK_SD_EMPTY_POP.size);
+  CU_ASSERT(tmp.data == STACK_SD_EMPTY_POP.data);
+
+  tmp = stack_sd_pop(&s);
+  CU_ASSERT(tmp.size == STACK_SD_EMPTY_POP.size);
+  CU_ASSERT(tmp.data == STACK_SD_EMPTY_POP.data);
+
+  for (i = 0; i < 5; i++)
+    sd_clear(&topush[i]);
+  stack_sd_clear(&s);
+}
+
+void test_stack_sd_lookup() {
+  stack_sd s;
+  stack_sd_init_size(&s, 8);
+
+  sd topush[20];
+  size_t i;
+  for (i = 0; i < 20; i++) {
+    sd_init_u64(&topush[i], i);
+    stack_sd_push(&s, topush[i]);
+  }
+
+  sd tmp;
+  sd_init_u64(&tmp, 13);
+  CU_ASSERT(stack_sd_lookup(&s, tmp) == 13);
+  sd_clear(&tmp);
+  sd_init_u64(&tmp, 22);
+  CU_ASSERT(stack_sd_lookup(&s, tmp) == STACK_SD_LOOKUP_NOT_FOUND);
+  sd_clear(&tmp);
+
+  for (i = 0; i < 5; i++)
+    sd_clear(&topush[i]);
+  stack_sd_clear(&s);
+}
diff --git a/utils/test/test_stack_sd.h b/utils/test/test_stack_sd.h
@@ -0,0 +1,14 @@
+#ifndef TEST_STACK_SD_H
+#define TEST_STACK_SD_H
+
+#include "../stack_sd.h"
+#include <CUnit/Basic.h>
+
+void test_stack_sd_init(void);
+void test_stack_sd_push(void);
+void test_stack_sd_get(void);
+void test_stack_sd_getlast(void);
+void test_stack_sd_pop(void);
+void test_stack_sd_lookup(void);
+
+#endif
diff --git a/utils/test/test_stack_str.c b/utils/test/test_stack_str.c
@@ -0,0 +1,74 @@
+#include "test_stack_str.h"
+
+void test_stack_str_init() {
+  stack_str t;
+  stack_str_init(&t);
+
+  CU_ASSERT(t.nmemb == 0);
+  CU_ASSERT(t.alloc > 0);
+  CU_ASSERT(t.data != NULL);
+
+  stack_str_clear(&t);
+}
+
+void test_stack_str_push() {
+  stack_str t;
+  stack_str_init(&t);
+
+  uint64_t i;
+  char buf[2 * BASE_STACK_STR_SIZE][256];
+  for (i = 0; i < 2 * BASE_STACK_STR_SIZE; i++) {
+    snprintf(buf[i], 256, "%llu", i);
+    stack_str_push(&t, buf[i]);
+  }
+
+  CU_ASSERT(t.alloc == 2 * BASE_STACK_STR_SIZE);
+  CU_ASSERT(t.nmemb == 2 * BASE_STACK_STR_SIZE);
+  for (i = 0; i < 2 * BASE_STACK_STR_SIZE; i++) {
+    CU_ASSERT(strncmp(buf[i], t.data[i], 256) == 0);
+  }
+
+  stack_str_clear(&t);
+}
+
+void test_stack_str_get_getlast() {
+  stack_str t;
+  stack_str_init(&t);
+
+  uint64_t i;
+  char buf[2 * BASE_STACK_STR_SIZE][256];
+  for (i = 0; i < 2 * BASE_STACK_STR_SIZE; i++) {
+    snprintf(buf[i], 256, "%llu", i);
+    stack_str_push(&t, buf[i]);
+  }
+
+  for (i = 0; i < t.nmemb; i++) {
+    CU_ASSERT(stack_str_get(&t, i) == buf[i]);
+  }
+  CU_ASSERT(stack_str_getlast(&t) == buf[2 * BASE_STACK_STR_SIZE - 1]);
+
+  stack_str_clear(&t);
+}
+
+void test_stack_str_pop() {
+  stack_str t;
+  stack_str_init(&t);
+
+  char *strs[3] = {"hello", "world", "this is a msg"};
+
+  stack_str_push(&t, strs[0]);
+  stack_str_push(&t, strs[1]);
+  stack_str_push(&t, strs[2]);
+
+  CU_ASSERT(t.nmemb == 3);
+  CU_ASSERT(stack_str_pop(&t) == strs[2]);
+  CU_ASSERT(t.nmemb == 2);
+  CU_ASSERT(stack_str_pop(&t) == strs[1]);
+  CU_ASSERT(t.nmemb == 1);
+  CU_ASSERT(stack_str_pop(&t) == strs[0]);
+  CU_ASSERT(t.nmemb == 0);
+  CU_ASSERT(stack_str_pop(&t) == STACK_STR_EMPTY_POP);
+  CU_ASSERT(t.nmemb == 0);
+
+  stack_str_clear(&t);
+}
diff --git a/utils/test/test_stack_str.h b/utils/test/test_stack_str.h
@@ -0,0 +1,12 @@
+#ifndef TEST_STACK_STR_H
+#define TEST_STACK_STR_H
+
+#include "../stack_str.h"
+#include <CUnit/Basic.h>
+
+void test_stack_str_init(void);
+void test_stack_str_push(void);
+void test_stack_str_get_getlast(void);
+void test_stack_str_pop(void);
+
+#endif
diff --git a/utils/test/test_stack_u64.c b/utils/test/test_stack_u64.c
@@ -0,0 +1,68 @@
+#include "test_stack_u64.h"
+
+void test_stack_u64_init() {
+  stack_u64 t;
+  stack_u64_init(&t);
+
+  CU_ASSERT(t.nmemb == 0);
+  CU_ASSERT(t.alloc > 0);
+  CU_ASSERT(t.data != NULL);
+
+  stack_u64_clear(&t);
+}
+
+void test_stack_u64_push() {
+  stack_u64 t;
+  stack_u64_init(&t);
+
+  uint64_t i;
+  for (i = 0; i < 2 * BASE_STACK_SIZE; i++) {
+    stack_u64_push(&t, i);
+  }
+
+  CU_ASSERT(t.alloc == 2 * BASE_STACK_SIZE);
+  CU_ASSERT(t.nmemb == 2 * BASE_STACK_SIZE);
+  for (i = 0; i < 2 * BASE_STACK_SIZE; i++) {
+    CU_ASSERT(t.data[i] == i);
+  }
+
+  stack_u64_clear(&t);
+}
+
+void test_stack_u64_get_getlast() {
+  stack_u64 t;
+  stack_u64_init(&t);
+
+  uint64_t i;
+  for (i = 0; i < 2 * BASE_STACK_SIZE; i++) {
+    stack_u64_push(&t, i);
+  }
+
+  for (i = 0; i < t.nmemb; i++) {
+    CU_ASSERT(stack_u64_get(&t, i) == i);
+  }
+  CU_ASSERT(stack_u64_getlast(&t) == 2 * BASE_STACK_SIZE - 1);
+
+  stack_u64_clear(&t);
+}
+
+void test_stack_u64_pop() {
+  stack_u64 t;
+  stack_u64_init(&t);
+
+  stack_u64_push(&t, 13);
+  stack_u64_push(&t, 16);
+  stack_u64_push(&t, 17);
+
+  CU_ASSERT(t.nmemb == 3);
+  CU_ASSERT(stack_u64_pop(&t) == 17);
+  CU_ASSERT(t.nmemb == 2);
+  CU_ASSERT(stack_u64_pop(&t) == 16);
+  CU_ASSERT(t.nmemb == 1);
+  CU_ASSERT(stack_u64_pop(&t) == 13);
+  CU_ASSERT(t.nmemb == 0);
+  CU_ASSERT(stack_u64_pop(&t) == STACK_U64_EMPTY_POP);
+  CU_ASSERT(t.nmemb == 0);
+
+  stack_u64_clear(&t);
+}
diff --git a/utils/test/test_stack_u64.h b/utils/test/test_stack_u64.h
@@ -0,0 +1,12 @@
+#ifndef TEST_STACK_U64_H
+#define TEST_STACK_U64_H
+
+#include "../stack_u64.h"
+#include <CUnit/Basic.h>
+
+void test_stack_u64_init(void);
+void test_stack_u64_push(void);
+void test_stack_u64_get_getlast(void);
+void test_stack_u64_pop(void);
+
+#endif
diff --git a/utils/test/testfile1.txt b/utils/test/testfile1.txt
@@ -0,0 +1,2 @@
+Hello, this is a test file.
+It contains two rows.
+\ No newline at end of file
diff --git a/utils/test/testfile2.txt b/utils/test/testfile2.txt
@@ -0,0 +1,2 @@
+4711ashdha65---1337asd
+addasda1asdl0asd
diff --git a/utils/test/tests.c b/utils/test/tests.c
@@ -0,0 +1,92 @@
+#include <CUnit/Basic.h>
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "test_ht.h"
+#include "test_reading.h"
+#include "test_sd.h"
+#include "test_set_u64.h"
+#include "test_smallset.h"
+#include "test_stack_sd.h"
+#include "test_stack_str.h"
+#include "test_stack_u64.h"
+
+static CU_pSuite add_suite(char *name, CU_InitializeFunc pInit,
+                           CU_CleanupFunc pClean) {
+  CU_pSuite pSuite = NULL;
+
+  if (CUE_SUCCESS != CU_initialize_registry())
+    exit(CU_get_error());
+
+  pSuite = CU_add_suite(name, pInit, pClean);
+  if (NULL == pSuite) {
+    CU_cleanup_registry();
+    exit(CU_get_error());
+  }
+
+  return (pSuite);
+}
+
+static void add_test(CU_pSuite s, char *desc, CU_TestFunc fn) {
+  if (NULL == CU_add_test(s, desc, fn)) {
+    CU_cleanup_registry();
+    exit(CU_get_error());
+  }
+}
+
+int main() {
+  if (CUE_SUCCESS != CU_initialize_registry())
+    return CU_get_error();
+
+  CU_pSuite s_all = add_suite("suite_all", NULL, NULL);
+
+  add_test(s_all, "reading - readall()", test_reading_readall);
+  add_test(s_all, "reading - readlines()", test_reading_readlines);
+  add_test(s_all, "reading - read_next_u64()", test_reading_read_next_u64);
+  add_test(s_all, "reading - sread_next_u64()", test_reading_sread_next_u64);
+
+  add_test(s_all, "stack_u64 - init()", test_stack_u64_init);
+  add_test(s_all, "stack_u64 - push()", test_stack_u64_push);
+  add_test(s_all, "stack_u64 - get_getlast()", test_stack_u64_get_getlast);
+  add_test(s_all, "stack_u64 - pop()", test_stack_u64_pop);
+
+  add_test(s_all, "stack_str - init()", test_stack_str_init);
+  add_test(s_all, "stack_str - push()", test_stack_str_push);
+  add_test(s_all, "stack_str - get_getlast()", test_stack_str_get_getlast);
+  add_test(s_all, "stack_str - pop()", test_stack_str_pop);
+
+  add_test(s_all, "sd - init()", test_sd_init);
+  add_test(s_all, "sd - cmp()", test_sd_cmp);
+  add_test(s_all, "sd - hash()", test_sd_hash);
+  add_test(s_all, "sd - sd_conv_u64()", test_sd_conv_u64);
+  add_test(s_all, "sd - sd_get_str()", test_sd_get_str);
+
+  add_test(s_all, "smallset - init()", test_smallset_init);
+  add_test(s_all, "smallset - insert()", test_smallset_insert);
+  add_test(s_all, "smallset - lookup()", test_smallset_lookup);
+  add_test(s_all, "smallset - intersection()", test_smallset_intersection);
+  add_test(s_all, "smallset - minus()", test_smallset_minus);
+  add_test(s_all, "smallset - tonstr()", test_smallset_tonstr);
+  add_test(s_all, "smallset - empty()", test_smallset_empty);
+  add_test(s_all, "smallset - cardinality()", test_smallset_cardinality);
+
+  add_test(s_all, "stack_sd - init()", test_stack_sd_init);
+  add_test(s_all, "stack_sd - push()", test_stack_sd_push);
+  add_test(s_all, "stack_sd - get()", test_stack_sd_get);
+  add_test(s_all, "stack_sd - getlast()", test_stack_sd_getlast);
+  add_test(s_all, "stack_sd - pop()", test_stack_sd_pop);
+  add_test(s_all, "stack_sd - lookup()", test_stack_sd_lookup);
+
+  add_test(s_all, "ht - init()", test_ht_init);
+  add_test(s_all, "ht - insert()", test_ht_insert);
+  add_test(s_all, "ht - lookup()", test_ht_lookup);
+
+  add_test(s_all, "set_u64 - init()", test_set_u64_init);
+
+  /* Run all tests using the CUnit Basic interface */
+  CU_basic_set_mode(CU_BRM_VERBOSE);
+  CU_basic_run_tests();
+  CU_cleanup_registry();
+  return CU_get_error();
+}
diff --git a/utils/wdg.c b/utils/wdg.c
@@ -0,0 +1,75 @@
+#include "wdg.h"
+
+void wdg_init(wdg_t *g, const size_t n) {
+  g->n = n;
+  g->nbrs = malloc(n * sizeof(*(g->nbrs)));
+  g->weight = malloc(n * sizeof(*(g->weight)));
+
+  size_t i;
+  for (i = 0; i < n; i++) {
+    stack_u64_init(&g->nbrs[i]);
+    stack_u64_init(&g->weight[i]);
+  }
+}
+
+void wdg_clear(wdg_t *g) {
+  size_t i;
+  for (i = 0; i < g->n; i++) {
+    stack_u64_clear(&g->nbrs[i]);
+    stack_u64_clear(&g->nbrs[i]);
+  }
+  free(g->nbrs);
+  free(g->weight);
+}
+
+void wdg_add_edge(wdg_t *g, const size_t v, const size_t w, uint64_t weight) {
+  stack_u64_push(&g->nbrs[v], w);
+  stack_u64_push(&g->weight[v], weight);
+}
+
+uint64_t wdg_dijkstra(wdg_t *g, const size_t source, const size_t target) {
+  size_t i;
+  uint64_t dist[g->n];
+  dist[source] = 0;
+  size_t prev[g->n];
+
+  fheap_t q;
+  fheap_init(&q);
+
+  size_t vertices[g->n];
+  fnode_t *qvertex[g->n];
+
+  for (i = 0; i < g->n; i++) {
+    vertices[i] = i;
+    if (i != source) {
+      dist[i] = UINT64_MAX;
+      prev[i] = SIZE_MAX;
+    }
+
+    qvertex[i] = fheap_insert(&q, dist[i], &(vertices[i]));
+  }
+
+  void *up;
+  size_t u, v;
+  uint64_t alt;
+  while (q.n > 0) {
+    size_t value = fheap_extract_min(&up, &q);
+    u = *(size_t *)up;
+    if (u == target)
+      break;
+    if (value == UINT64_MAX)
+      break;
+
+    for (i = 0; i < (g->nbrs[u]).nmemb; i++) {
+      v = (g->nbrs[u]).data[i];
+      alt = dist[u] + (g->weight[u]).data[i];
+      if (alt < dist[v]) {
+        dist[v] = alt;
+        prev[v] = u;
+        fheap_decrease_value(&q, qvertex[v], alt);
+      }
+    }
+  }
+
+  return dist[target];
+}
diff --git a/utils/wdg.h b/utils/wdg.h
@@ -0,0 +1,18 @@
+#ifndef WDG_H
+#define WDG_H
+
+#include "fheap.h"
+#include "stack_u64.h"
+
+typedef struct {
+  size_t n;
+  stack_u64 *nbrs;
+  stack_u64 *weight;
+} wdg_t;
+
+void wdg_init(wdg_t *g, const size_t n);
+void wdg_clear(wdg_t *g);
+void wdg_add_edge(wdg_t *g, const size_t v, const size_t w, uint64_t weight);
+uint64_t wdg_dijkstra(wdg_t *g, const size_t source, const size_t target);
+
+#endif

	aocc23 Advent of Code 2023
	git clone git://www.tkruger.se/aocc23.git
	Log \| Files \| Refs \| README

A	.clangd	\|	2	++
A	Makefile	\|	13	+++++++++++++
A	README	\|	22	++++++++++++++++++++++
A	TODO	\|	5	+++++
A	day1/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day1/common.c	\|	3	+++
A	day1/common.h	\|	12	++++++++++++
A	day1/input	\|	1000	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day1/uppga.c	\|	37	+++++++++++++++++++++++++++++++++++++
A	day1/uppgb.c	\|	75	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day10/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day10/common.c	\|	3	+++
A	day10/common.h	\|	14	++++++++++++++
A	day10/input	\|	140	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day10/uppga.c	\|	129	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day10/uppgb.c	\|	302	++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day11/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day11/common.c	\|	3	+++
A	day11/common.h	\|	13	+++++++++++++
A	day11/exinput	\|	10	++++++++++
A	day11/input	\|	140	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day11/uppga.c	\|	98	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day11/uppgb.c	\|	98	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day12/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day12/common.c	\|	3	+++
A	day12/common.h	\|	14	++++++++++++++
A	day12/exinput	\|	6	++++++
A	day12/input	\|	1000	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day12/uppga.c	\|	236	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day12/uppgb.c	\|	288	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day13/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day13/common.c	\|	3	+++
A	day13/common.h	\|	13	+++++++++++++
A	day13/exinput	\|	15	+++++++++++++++
A	day13/input	\|	1387	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day13/uppga.c	\|	90	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day13/uppgb.c	\|	112	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day14/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day14/common.c	\|	14	++++++++++++++
A	day14/common.h	\|	13	+++++++++++++
A	day14/exinput	\|	10	++++++++++
A	day14/input	\|	100	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day14/uppga.c	\|	35	+++++++++++++++++++++++++++++++++++
A	day14/uppgb.c	\|	187	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day15/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day15/common.c	\|	3	+++
A	day15/common.h	\|	15	+++++++++++++++
A	day15/exinput	\|	1	+
A	day15/input	\|	1	+
A	day15/uppga.c	\|	30	++++++++++++++++++++++++++++++
A	day15/uppgb.c	\|	139	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day16/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day16/common.c	\|	3	+++
A	day16/common.h	\|	13	+++++++++++++
A	day16/exinput	\|	10	++++++++++
A	day16/input	\|	110	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day16/uppga.c	\|	227	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day16/uppgb.c	\|	298	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day17/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day17/common.c	\|	3	+++
A	day17/common.h	\|	14	++++++++++++++
A	day17/exinput	\|	13	+++++++++++++
A	day17/input	\|	141	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day17/uppga.c	\|	111	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day17/uppgb.c	\|	111	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day18/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day18/common.c	\|	22	++++++++++++++++++++++
A	day18/common.h	\|	16	++++++++++++++++
A	day18/exinput	\|	14	++++++++++++++
A	day18/input	\|	640	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day18/uppga.c	\|	48	++++++++++++++++++++++++++++++++++++++++++++++++
A	day18/uppgb.c	\|	65	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day19/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day19/common.c	\|	107	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day19/common.h	\|	28	++++++++++++++++++++++++++++
A	day19/exinput	\|	17	+++++++++++++++++
A	day19/input	\|	707	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day19/uppga.c	\|	95	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day19/uppgb.c	\|	389	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day2/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day2/common.c	\|	3	+++
A	day2/common.h	\|	13	+++++++++++++
A	day2/input	\|	100	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day2/uppga.c	\|	54	++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day2/uppgb.c	\|	55	+++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day20/Makefile	\|	31	+++++++++++++++++++++++++++++++
A	day20/common.c	\|	3	+++
A	day20/common.h	\|	16	++++++++++++++++
A	day20/exinput	\|	5	+++++
A	day20/exinput2	\|	5	+++++
A	day20/input	\|	58	++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day20/uppga.c	\|	230	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day20/uppgb.c	\|	254	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day21/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day21/common.c	\|	47	+++++++++++++++++++++++++++++++++++++++++++++++
A	day21/common.h	\|	23	+++++++++++++++++++++++
A	day21/exinput	\|	11	+++++++++++
A	day21/input	\|	131	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day21/uppga.c	\|	57	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day21/uppgb.c	\|	129	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day22/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day22/common.c	\|	92	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day22/common.h	\|	29	+++++++++++++++++++++++++++++
A	day22/exinput	\|	7	+++++++
A	day22/input	\|	1203	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day22/uppga.c	\|	54	++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day22/uppgb.c	\|	61	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day23/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day23/common.c	\|	34	++++++++++++++++++++++++++++++++++
A	day23/common.h	\|	17	+++++++++++++++++
A	day23/exinput	\|	23	+++++++++++++++++++++++
A	day23/input	\|	141	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day23/uppga.c	\|	58	++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day23/uppgb.c	\|	54	++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day24/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day24/common.c	\|	57	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day24/common.h	\|	29	+++++++++++++++++++++++++++++
A	day24/exinput	\|	5	+++++
A	day24/input	\|	300	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day24/uppga.c	\|	152	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day24/uppgb.c	\|	100	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day25/Makefile	\|	26	++++++++++++++++++++++++++
A	day25/common.h	\|	15	+++++++++++++++
A	day25/exinput	\|	13	+++++++++++++
A	day25/input	\|	1220	++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day25/uppga.c	\|	94	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day3/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day3/common.c	\|	59	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day3/common.h	\|	20	++++++++++++++++++++
A	day3/exinput	\|	10	++++++++++
A	day3/input	\|	140	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day3/uppga.c	\|	54	++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day3/uppgb.c	\|	104	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day4/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day4/common.c	\|	29	+++++++++++++++++++++++++++++
A	day4/common.h	\|	15	+++++++++++++++
A	day4/exinput	\|	6	++++++
A	day4/input	\|	202	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day4/uppga.c	\|	34	++++++++++++++++++++++++++++++++++
A	day4/uppgb.c	\|	43	+++++++++++++++++++++++++++++++++++++++++++
A	day5/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day5/common.c	\|	47	+++++++++++++++++++++++++++++++++++++++++++++++
A	day5/common.h	\|	22	++++++++++++++++++++++
A	day5/exinput	\|	33	+++++++++++++++++++++++++++++++++
A	day5/input	\|	236	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day5/uppga.c	\|	47	+++++++++++++++++++++++++++++++++++++++++++++++
A	day5/uppgb.c	\|	108	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day6/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day6/common.c	\|	35	+++++++++++++++++++++++++++++++++++
A	day6/common.h	\|	17	+++++++++++++++++
A	day6/exinput	\|	2	++
A	day6/input	\|	2	++
A	day6/uppga.c	\|	22	++++++++++++++++++++++
A	day6/uppgb.c	\|	28	++++++++++++++++++++++++++++
A	day7/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day7/common.c	\|	56	++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day7/common.h	\|	20	++++++++++++++++++++
A	day7/exinput	\|	5	+++++
A	day7/input	\|	1000	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day7/uppga.c	\|	78	++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day7/uppgb.c	\|	130	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day8/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day8/common.c	\|	20	++++++++++++++++++++
A	day8/common.h	\|	19	+++++++++++++++++++
A	day8/input	\|	736	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day8/uppga.c	\|	28	++++++++++++++++++++++++++++
A	day8/uppgb.c	\|	122	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day9/Makefile	\|	30	++++++++++++++++++++++++++++++
A	day9/common.c	\|	3	+++
A	day9/common.h	\|	14	++++++++++++++
A	day9/exinput	\|	3	+++
A	day9/input	\|	200	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day9/uppga.c	\|	69	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	day9/uppgb.c	\|	69	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	template/Makefile	\|	30	++++++++++++++++++++++++++++++
A	template/common.c	\|	3	+++
A	template/common.h	\|	13	+++++++++++++
A	template/uppga.c	\|	7	+++++++
A	template/uppgb.c	\|	7	+++++++
A	utils/Makefile	\|	19	+++++++++++++++++++
A	utils/dg.c	\|	21	+++++++++++++++++++++
A	utils/dg.h	\|	15	+++++++++++++++
A	utils/dict.c	\|	111	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/dict.h	\|	33	+++++++++++++++++++++++++++++++++
A	utils/fheap.c	\|	249	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/fheap.h	\|	40	++++++++++++++++++++++++++++++++++++++++
A	utils/graph.c	\|	22	++++++++++++++++++++++
A	utils/graph.h	\|	15	+++++++++++++++
A	utils/ht.c	\|	40	++++++++++++++++++++++++++++++++++++++++
A	utils/ht.h	\|	73	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/play/Makefile	\|	30	++++++++++++++++++++++++++++++
A	utils/play/tests.c	\|	38	++++++++++++++++++++++++++++++++++++++
A	utils/reading.c	\|	158	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/reading.h	\|	82	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/sd.c	\|	60	++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/sd.h	\|	103	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/set_u64.c	\|	70	++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/set_u64.h	\|	28	++++++++++++++++++++++++++++
A	utils/set_u64p.c	\|	75	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/set_u64p.h	\|	28	++++++++++++++++++++++++++++
A	utils/smallset.c	\|	100	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/smallset.h	\|	132	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/stack_sd.c	\|	53	+++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/stack_sd.h	\|	97	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/stack_str.c	\|	38	++++++++++++++++++++++++++++++++++++++
A	utils/stack_str.h	\|	70	++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/stack_u64.c	\|	40	++++++++++++++++++++++++++++++++++++++++
A	utils/stack_u64.h	\|	67	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/test/Makefile	\|	43	+++++++++++++++++++++++++++++++++++++++++++
A	utils/test/test_ht.c	\|	75	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/test/test_ht.h	\|	11	+++++++++++
A	utils/test/test_reading.c	\|	61	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/test/test_reading.h	\|	12	++++++++++++
A	utils/test/test_sd.c	\|	93	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/test/test_sd.h	\|	13	+++++++++++++
A	utils/test/test_set_u64.c	\|	19	+++++++++++++++++++
A	utils/test/test_set_u64.h	\|	9	+++++++++
A	utils/test/test_smallset.c	\|	207	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/test/test_smallset.h	\|	17	+++++++++++++++++
A	utils/test/test_stack_sd.c	\|	140	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/test/test_stack_sd.h	\|	14	++++++++++++++
A	utils/test/test_stack_str.c	\|	74	++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/test/test_stack_str.h	\|	12	++++++++++++
A	utils/test/test_stack_u64.c	\|	68	++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/test/test_stack_u64.h	\|	12	++++++++++++
A	utils/test/testfile1.txt	\|	3	+++
A	utils/test/testfile2.txt	\|	2	++
A	utils/test/tests.c	\|	92	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/wdg.c	\|	75	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A	utils/wdg.h	\|	18	++++++++++++++++++