aoc

My solutions for the Advent of Code
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1a.c (368B)

      1 #include <stdio.h>
      2 
      3 #define N 10000
      4 
      5 int main() {
      6 	char *buf, line[N];
      7 	int first, last, sum;
      8 
      9 	sum = 0;
     10 	while ((buf = fgets(line, N, stdin)) != NULL) {
     11 		for (first = -1; *buf; buf++) {
     12 			if (*buf < '0' || *buf > '9') continue;
     13 			first = first == -1 ? *buf - '0' : first;
     14 			last = *buf - '0';
     15 		}
     16 		sum += 10 * first + last;
     17 	}
     18 	printf("%d\n", sum);
     19 	return 0;
     20 }