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.IO;
using System.Linq;
using System.Text;

namespace CsTest
{
    static class CsTest
    {
        static long maximumval = 1;

        static long agg(long lh, long rh)
        {
            if (rh == 0) return 0;
            if (lh * rh < 0) return -1;
            return lh * rh;
        }

        static void Main(string[] args)
        {
            for (int i = 0; i < 18; ++i)
                maximumval *= 10L;
            Console.ReadLine();
            long current = 1;
            foreach (var i in Console.ReadLine().Split(' ').Select(i => long.Parse(i)))
            {
                if (current == -1)
                    current = i == 0 ? 0 : -1;
                else if (current > maximumval)
                    current = -1;
                else
                    current = agg(current, i);
            }
            Console.WriteLine(current > maximumval ? -1l : current);
        }
    }
}