[LeetCode]#1822. Sign of the Product of an Array

Environment: Python 3.8

Key technique: for, if

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

Analysis:

1. init ans=1
2. ans=ans x nums[i] by using loop
3. if ans >0, return 1
4. if ans <0, return -1
5. if ans==0, return 0

Solution:

class Solution:
    def arraySign(self, nums):
        ans=1
        for i in range(len(nums)):
            ans=ans*nums[i]
        if ans >0:
            return 1
        if ans <0:
            return -1
        if ans ==0:
            return 0

Submissions: