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.Numerics;
using System.Linq;
using System.Text;
using static System.Math;

class MainClass
{


    public static void Main(string[] args)
    {
        var N = LnInt();
        var _ = LnLngs();
        var resu = 0L;
        foreach(var i in _)
        {
            try{
                resu *= i;
            }catch(OverflowException e)
            {
                print(-1);
                return;
            }
        }
        print(resu);
    }


    public static long SumAtoB(long a, long b) { var length = b - a + 1; return (a + b) * (length / 2) + (length % 2 == 1 ? (a + b) / 2 : 0); }
    public static long PowLite(long n, long p, long mod = (long)1e9 + 7) { long ans = 1; long now = n; for (; p > 0; p >>= 1) { if ((p & 1) == 1) { ans *= now; ans %= mod; } now *= now; now %= mod; } return ans; }
    public static void print(object obj) { Console.WriteLine(obj); }
    public static long Gcd(long a, long b) { if (a > b) { var r = a % b; if (r == 0) return b; else return Gcd(b, r); } else { var r = b % a; if (r == 0) return a; else return Gcd(a, r); } }
    public static int Gcd(int a, int b) { if (a > b) { var r = a % b; if (r == 0) return b; else return Gcd(b, r); } else { var r = b % a; if (r == 0) return a; else return Gcd(a, r); } }
    public static int[] LnInts() { var vs = Console.ReadLine().Trim().Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries); var ins = new int[vs.Length]; for (int i = 0; i < vs.Length; i++) ins[i] = int.Parse(vs[i]); return ins; }
    public static int LnInt() { var vs = Console.ReadLine().Trim(); return int.Parse(vs); }
    public static long[] LnLngs() { var vs = Console.ReadLine().Trim().Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries); var ins = new long[vs.Length]; for (int i = 0; i < vs.Length; i++) ins[i] = long.Parse(vs[i]); return ins; }
    public static long LnLng() { var vs = Console.ReadLine().Trim(); return long.Parse(vs); }
    public static string[] LnStrs() { var vs = Console.ReadLine().Trim().Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries); return vs; }
    public static string LnStr() { var vs = Console.ReadLine().Trim(); return vs; }
    public static List<T[]> AllPermutation<T>(params T[] array) where T : IComparable { var a = new List<T>(array).ToArray(); var res = new List<T[]>(); res.Add(new List<T>(a).ToArray()); var n = a.Length; var next = true; while (next) { next = false; int i; for (i = n - 2; i >= 0; i--) { if (a[i].CompareTo(a[i + 1]) < 0) break; } if (i < 0) break; var j = n; do { j--; } while (a[i].CompareTo(a[j]) > 0); if (a[i].CompareTo(a[j]) < 0) { var tmp = a[i]; a[i] = a[j]; a[j] = tmp; Array.Reverse(a, i + 1, n - i - 1); res.Add(new List<T>(a).ToArray()); next = true; } } return res; }
}