README_EN.md

1822. Sign of the Product of an Array

中文文档

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:
        ans = 1
        for v in nums:
            if v == 0:
                return 0
            if v < 0:
                ans *= -1
        return ans

Java

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

C++

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

Go

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

JavaScript

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

Rust

use std::cmp::Ordering;
impl Solution {
    pub fn array_sign(nums: Vec<i32>) -> i32 {
        let mut res = 1;
        for num in nums.iter() {
            match num.cmp(&0) {
                Ordering::Equal => return 0,
                Ordering::Less => res *= -1,
                Ordering::Greater => {}
            }
        }
        res
    }
}

...