aoc2021/01/solution.c

#include <stdio.h>
#include <stdint.h>

#include "input.h"

int main(void) {
    uint16_t answer = 0;
    uint32_t prev = 0;
    for (uint16_t *p = input+3; p < (&input)[1]; p++) {
        uint32_t new = *(p-2) + *(p-1) + *p;

        if (new > prev)
            answer++;

        prev = new;
    }

    printf("Answer: %d\n", answer);
}