README_EN.md

1822. Sign of the Product of an Array

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Description

There is a function signFunc(x) that returns:

• 1 if x is positive.
• -1 if x is negative.
• 0 if x is equal to 0.

You are given an integer array nums. Let product be the product of all values in the array nums.

Return signFunc(product).

 

Example 1:

Input: nums = [-1,-2,-3,-4,3,2,1]
Output: 1
Explanation: The product of all values in the array is 144, and signFunc(144) = 1

Example 2:

Input: nums = [1,5,0,2,-3]
Output: 0
Explanation: The product of all values in the array is 0, and signFunc(0) = 0

Example 3:

Input: nums = [-1,1,-1,1,-1]
Output: -1
Explanation: The product of all values in the array is -1, and signFunc(-1) = -1

 

Constraints:

• 1 <= nums.length <= 1000
• -100 <= nums[i] <= 100

Solutions

Python3

class Solution:
    def arraySign(self, nums: List[int]) -> int:
        res = 1
        for num in nums:
            if num == 0:
                return 0
            if num < 0:
                res *= -1
        return res

Java

class Solution {
    public int arraySign(int[] nums) {
        int res = 1;
        for (int num : nums) {
            if (num == 0) return 0;
            if (num < 0) res *= -1;
        }
        return res;
    }
}

JavaScript

/**
 * @param {number[]} nums
 * @return {number}
 */
var arraySign = function (nums) {
    let res = 1;
    for (let num of nums) {
        if (num == 0) return 0;
        if (num < 0) res *= -1;
    }
    return res;
};

C++

class Solution {
public:
    int arraySign(vector<int>& nums) {
        int res = 1;
        for (auto &num : nums) {
            if (num == 0) {
                return 0;
            }
            if (num < 0) {
                res *= -1;
            }
        }
        return res;
    }
};

Go

func arraySign(nums []int) int {
	res := 1
	for _, num := range nums {
		if num == 0 {
			return 0
		}
		if num < 0 {
			res *= -1
		}
	}
	return res
}

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