Formatted question description: https://leetcode.ca/all/1822.html

1822. Sign of the Product of an Array

Level

Easy

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

Solution

Loop over nums. If a zero is found, return 0. Otherwise, count the number of negative numbers. If the number of negative numbers is even, return 1. Otherwise, return -1.

class Solution {
    public int arraySign(int[] nums) {
        int negativeCount = 0;
        for (int num : nums) {
            if (num < 0)
                negativeCount++;
            else if (num == 0)
                return 0;
        }
        return negativeCount % 2 == 0 ? 1 : -1;
    }
}

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