Problem:
Score : 200 points

Problem Statement

Given N integers A_1, ..., A_N, compute A_1 \times ... \times A_N.

However, if the result exceeds 10^{18}, print -1 instead.

Constraints

2 \leq N \leq 10^5

0 \leq A_i \leq 10^{18}

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N
A_1 ... A_N

Output

Print the value A_1 \times ... \times A_N as an integer, or -1 if the value exceeds 10^{18}.

Sample Input 1

2
1000000000 1000000000

Sample Output 1

1000000000000000000

We have 1000000000 \times 1000000000 = 1000000000000000000.

Sample Input 2

3
101 9901 999999000001

Sample Output 2

-1

We have 101 \times 9901 \times 999999000001 = 1000000000000000001, which exceeds 10^{18}, so we should print -1 instead.

Sample Input 3

31
4 1 5 9 2 6 5 3 5 8 9 7 9 3 2 3 8 4 6 2 6 4 3 3 8 3 2 7 9 5 0

Sample Output 3

0

Solution in Java (OpenJDK 11.0.6) (judge verdict: Wrong Answer)

import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        long N = sc.nextLong();
        List<Long> kazu = new ArrayList<>();
        
        long ans = 1;
        long max = 1000000000000000000l;
        for(int i = 0;i < N;i++){
            long temp = sc.nextLong();;
            kazu.add(temp);
        }
        for(int i = 0;i < N;i++){
            long temp2 = kazu.get(i);
            ans *= temp2;
            if(ans >= max){
            break;
            }
        }
        //System.out.println(kazu);
        if(kazu.contains(0l)){
            System.out.println(0);
        }
        else if(ans <= max){
            System.out.println(ans);
        }else{
            System.out.println(-1);
        }
    }
}