Leetcode 1822. Sign of the Product of an Array

Posted 2021-09-05 SnailTyan

文章作者：Tyan
博客：noahsnail.com  |  CSDN  |  简书

1. Description

2. Solution

**解析：**Version 1，碰到0直接返回0，计数负数的个数，如果负数个数时奇数返回-1，偶数返回1。

• Version 1

class Solution:
    def arraySign(self, nums: List[int]) -> int:
        count = 0
        for num in nums:
            if num == 0:
                return 0
            elif num < 0:
                count += 1
        if count % 2 == 0:
            return 1
        else:
            return -1

• Version 2

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

Reference

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