LeetCode 1822. Sign of the Product of an Array

Description

https://leetcode.com/problems/sign-of-the-product-of-an-array/

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

Explanation

Find the product of the nums and return the value as the problem describes.

Python Solution

class Solution:
    def arraySign(self, nums: List[int]) -> int:
     
        product = 1
        
        for num in nums:
            product *= num
            
            
        if product > 0:
            return 1
        elif product == 0:
            return 0
        else:
            return -1
  • Time Complexity: O(N).
  • Space Complexity: O(1).

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