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"
	"math"
	"os"
	"strconv"
)

var sc = bufio.NewScanner(os.Stdin)

func nextInt() int {
	sc.Scan()
	num, err := strconv.Atoi(sc.Text())
	if err != nil {
		panic(err)
	}
	return num
}

func nextString() string {
	sc.Scan()
	return sc.Text()
}

func getMin(x ...int) int {
	min := math.MaxInt64
	for i := 0; i < len(x); i++ {
		if x[i] < min {
			min = x[i]
		}
	}
	return min
}

func getMax(x ...int) int {
	max := math.MinInt64
	for i := 0; i < len(x); i++ {
		if x[i] > max {
			max = x[i]
		}
	}
	return max
}

func pow(x, pow int) int {
	ans := x
	for i := 1; i < pow; i++ {
		ans = ans * x
	}
	return ans
}

func abs(x int) int {
	if x < 0 {
		return -x
	}
	return x
}

func main() {
	// sc.Buffer([]byte{}, math.MaxInt64)
	sc.Split(bufio.ScanWords)

	// w := bufio.NewWriter(os.Stdout)
	// defer w.Flush()

	bar := 1000000000000000000

	n := nextInt()
	ans := func() int {
		total := 1
		flag := false
		for i := 0; i < n; i++ {
			a := nextInt()
			if a == 0 {
				return 0
			}
			total = total * a
			if total > bar {
				flag = true
				total = 1
			}
		}

		if flag {
			return -1
		}
		return total
	}()

	fmt.Println(ans)
}