Sample Code

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#include <assert.h>
#include <ctype.h>
#include <limits.h>
#include <math.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char* readline();
char* ltrim(char*);
char* rtrim(char*);
int parse_int(char*);
/*
 * Complete the 'sumCoins' function below.
 *
 * The function is expected to return an INTEGER.
 * The function accepts following parameters:
 *  1. INTEGER price
 *  2. INTEGER_ARRAY coins
 */
int sumCoins(int price, int coins_count, int* coins) {
    // Go through every possible combination of 3 coins and see if any of them add up to the exact change required
    int i = 0;
    while (i < coins_count) {
        int j = i + 1;
        while (j < coins_count) {
            int k = j + 1;
            while (k < coins_count) {
                if (coins[i] + coins[j] + coins[k] == price) {
                    return 1;
                }
                k++;
            }
            j++;
        }
        i++;
    }
    return 0;
}
int main()
{
    FILE* fptr = fopen(getenv("OUTPUT_PATH"), "w");
    int p = parse_int(ltrim(rtrim(readline())));
    int n = parse_int(ltrim(rtrim(readline())));
    int* coins_array = malloc(n * sizeof(int));
    for (int i = 0; i < n; i++) {
        int coins_array_item = parse_int(ltrim(rtrim(readline())));
        *(coins_array + i) = coins_array_item;
    }
    int result = sumCoins(p, n, coins_array);
    fprintf(fptr, "%d\n", result);
    fclose(fptr);
    return 0;
}
char* readline() {
    size_t alloc_length = 1024;
    size_t data_length = 0;
    char* data = malloc(alloc_length);
    while (true) {
        char* cursor = data + data_length;
        char* line = fgets(cursor, alloc_length - data_length, stdin);
        if (!line) {
            break;
        }
        data_length += strlen(cursor);
        if (data_length < alloc_length - 1 || data[data_length - 1] == '\n') {
            break;
        }
        alloc_length <<= 1;
        data = realloc(data, alloc_length);
        if (!data) {
            data = '\0';
            break;
        }
    }
    if (data[data_length - 1] == '\n') {
        data[data_length - 1] = '\0';
        data = realloc(data, data_length);
        if (!data) {
            data = '\0';
        }
    } else {
        data = realloc(data, data_length + 1);
        if (!data) {
            data = '\0';
        } else {
            data[data_length] = '\0';
        }
    }
    return data;
}
char* ltrim(char* str) {
    if (!str) {
        return '\0';
    }
    if (!*str) {
        return str;
    }
    while (*str != '\0' && isspace(*str)) {
        str++;
    }
    return str;
}
char* rtrim(char* str) {
    if (!str) {
        return '\0';
    }
    if (!*str) {
        return str;
    }
    char* end = str + strlen(str) - 1;
    while (end >= str && isspace(*end)) {
        end--;
    }
    *(end + 1) = '\0';
    return str;
}
int parse_int(char* str) {
    char* endptr;
    int value = strtol(str, &endptr, 10);
    if (endptr == str || *endptr != '\0') {
        exit(EXIT_FAILURE);
    }
    return value;
}