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 JavaScript (Node.js 12.16.1) (judge verdict: Accepted)

const main = (input) => {
	const args = input.trim().split("\n");
	const N = args[0]
	const As = args[1].trim().split(" ")
	let flag = ''
	if (As.includes('0')) { flag = 'zero' }
	let answer = As[0]

	const limit = 10 ** 18
	if (flag !== 'zero') {
		let i = 1;
		while (i < As.length) {
			if (answer <= limit) {
				answer = BigInt(answer) * BigInt(As[i])
				i = (i + 1) | 0
				if (answer > limit) {
					flag = 'over'
					break
				}
			}
		}
	}
	switch (flag) {
		case 'zero' :
			console.log(0)
			break
		case 'over':
			console.log(-1)
			break
		default:
			console.log(answer.toString())
	}
}

main(require('fs').readFileSync('/dev/stdin', 'utf8'))