1/part2.c


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#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define INPUT_LEN 200

int repair(int * arr)
{
    for (int i = 0; i < INPUT_LEN; i++) {
        for (int j = 0; j < INPUT_LEN; j++) {
            for (int k = 0; k < INPUT_LEN; k++) {
                if (arr[i] + arr[j] + arr[k] == 2020) {
                    return arr[i] * arr[j] * arr[k];
                }
            }
        }
    }

    return 0;
}

int main()
{
    FILE * file = fopen("input", "r");

    char buffer[8] = { 0 };
    int input[INPUT_LEN] = { 0 };
    for (int i = 0; i < 200; i++) {
        fgets(buffer, 8, file);
        input[i] = atoi(buffer);
    }

    printf("%i", repair(input));
}