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: Runtime Error)


    using System;
    using System.Linq;
    using System.Collections.Generic;
    using System.IO;
    using System.Text;
    using System.Text.RegularExpressions;

    class Program
    {
        static void Main()
        {
            //try
            //{
            //    var count = decimal.Parse(Console.ReadLine());

            //    var ins = Console.ReadLine().Split(" ");

            //    var result = (decimal)1;

            //    var nums = ins.Select(x => decimal.Parse(x)).OrderBy(x => x);

            //    var m = (decimal)Math.Pow(10, 18);

            //    if (nums.Contains(0))
            //    {
            //        Console.WriteLine((0).ToString());
            //        return;
            //    }

            //    foreach (var num in nums)
            //    {
            //        result *= num;
            //        if (result > m)
            //        {
            //            Console.WriteLine((-1).ToString());
            //            return;
            //        }
            //    }

            //    Console.WriteLine(result.ToString());
            //    return;
            //}
            //catch
            //{
            //    Console.WriteLine((-1).ToString());
            //    return;
            //}

            var n = int.Parse(Console.ReadLine());
            var a = System.Console.ReadLine().Split(' ').Select((x) => decimal.Parse(x)).ToList();
            decimal ans = 1m;

            if (a.Any(x => x == 0m))
            {
                Console.WriteLine("0");
                return;
            }
            foreach (var item in a)
            {
                ans *= item;
                if (ans > (decimal)Math.Pow(10, 18))
                {
                    Console.WriteLine("-1");
                    return;
                }
            }
            Console.WriteLine(ans.ToString());

        }
    }