B - Multiplication 2

#include <bits/stdc++.h>
using namespace std;

int main() {
    int n;
    cin >> n;
    long long arr[100010];

    for (int i = 0; i < n; i++) {
        scanf("%lld", &arr[i]);
    }

    long long int mul = 1;

    for (int i = 0; i < n; i++) {
        if (arr[i] == 0) {
            printf("0\n");
            return 0;
        }
    }

    for (int i = 0; i < n; i++) {
        if (arr[i] <= 1000000000000000000 / mul) {
            mul *= arr[i];
        } else {
            printf("-1\n");
            return 0;
        }
    }

    printf("%lld\n", mul);
    return 0;
}