AoC2022/03.c

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2022-12-03 14:54:25 +00:00
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int get_prio (char c) {
int r = (int) (c - 'a'+1);
if (r > 0) return r;
return r + 'A' - 7;
}
int main () {
char cur[50];
int half = 0;
u_int64_t mask = 0;
int sum = 0;
while (fgets(cur,50,stdin) != NULL) {
int i;
half = strlen(cur) / 2;
for (i = 0; i<half; i++) {
//printf("%c %d\n", cur[i], get_prio(cur[i]));
mask |= (1LL << get_prio(cur[i]));
}
//printf("half!\n");
for (i=half; i<strlen(cur)-1; i++) {
//printf("%c %d\n", cur[i], get_prio(cur[i]));
if (mask & (1LL << get_prio(cur[i]))) {
// printf("%c", cur[i]);
sum += get_prio(cur[i]);
break;
}
}
mask = 0;
}
printf("%d\n", sum);
}