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 C# (.NET Core 3.1.201) (judge verdict: Wrong Answer)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

class B
{

        static void Main()
        {
            const long M=1000000000000000000;
            long n=long.Parse(Console.ReadLine());
            var a=Console.ReadLine().Split().Select(long.Parse).OrderBy(x=>x).ToArray();
            long s=1L;
            for(int i=0;i<n;i++){
                if(a[i]==0)
                {
                    s=0;
                    break;
                }
                if(a[i]<=M){
                    s*=a[i];
                    if(s>=M){
                        s=-1;
                        break;
                    }
                }
                else{
                    s=-1;
                    break;
                }
            }
            Console.WriteLine(s);
        }
}