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 Go (1.14.1) (judge verdict: Wrong Answer)

package main

import (
	"fmt"
	"math"
)

func main() {
	var n int
	var result uint64
	fmt.Scanf("%d", &n)
	arr := make([]uint64, n)
	for i:=0; i<n; i++ {
		fmt.Scanf("%d", &arr[i])
	}
	result = 1
	toobig := false
	containzero := false
	for _,value := range arr {
		result *= value
		if value == 0 {
			containzero = true
			break
		}
		if result >= uint64(math.Pow(10, 18)) {
			toobig = true
		}
	}
	if containzero {
		fmt.Printf("%d", result)
	} else if toobig || result > uint64(math.Pow(10, 18)) {
		fmt.Printf("-1")
	} else {
		fmt.Printf("%d", result)
	}
}