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 (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func main() {

	var n int64
	// //fmt.Println("n")
	fmt.Scanf("%d", &n)
	// //fmt.Println("input" + strconv.FormatInt(n, 10))
	// inputAarray := make([]uint64, 0, n)

	// for {
	//fmt.Println("A:" + strconv.FormatInt(count, 10))
	// 	fmt.Scanf("%d", &a)
	// 	//fmt.Println("input" + strconv.FormatInt(a, 10))
	// 	inputAarray = append(inputAarray, a)
	// 	count++
	// 	if count+1 > n {
	// 		break
	// 	}
	// }
	var instr string
	var sc = bufio.NewScanner(os.Stdin)
	if sc.Scan() {
		instr = sc.Text()
	}
	// fmt.Println("instrnum:" + instr)
	inarray := strings.Split(instr, " ")
	var vrslt int64
	vrslt = 1
	// fmt.Println("size:" + strconv.Itoa(len(inarray)))
	iszero := 1
	for _, v := range inarray {
		var a int64
		//fmt.Println("vrslt:" + strconv.FormatInt(vrslt, 10))
		a, err := strconv.ParseInt(v, 10, 64)
		if err != nil {
			// fmt.Println(err)
		}
		// fmt.Println("vrslt:" + strconv.FormatUint(vrslt, 10))
		if a == 0 {
			iszero = 0
			break
		}
		if vrslt > 1000000000000000000/a {
			vrslt = -1
		}
		vrslt = vrslt * a
	}

	if iszero == 0 {
		fmt.Printf("%d", 0)
	} else {
		fmt.Printf("%d", vrslt)
	}
}