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aoc2021/02/solution_2.c

28 lines
559 B
C

#include <stdio.h>
#include <string.h>
int main(void) {
FILE *fp = fopen("input.txt", "r");
char buf[16] = {0};
unsigned n, aim = 0, h = 0, v = 0;
while (fgets(buf, 16, fp) != NULL) {
sscanf(buf, "%*s %u", &n);
switch (buf[0]) {
case 'd':
aim += n;
break;
case 'u':
aim -= n;
break;
case 'f':
h += n;
v += aim * n;
break;
}
}
printf("Answer: %u\n", h * v);
}