aocc22

Advent of Code 2022
git clone git://www.tkruger.se/aocc22.git
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common.c (197B)

      1 #include "common.h"
      2 
      3 int pairwise_diff(char *s, size_t n) {
      4   int i, j;
      5 
      6   for (i = n - 2; i >= 0; i--)
      7     for (j = i + 1; j < n; j++)
      8       if (s[i] == s[j])
      9         return i + 1;
     10 
     11   return 0;
     12 }