1822.Sign of the Product of an Array

tags: Easy,Array,Math

1822. Sign of the Product of an Array

題目描述

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).

範例

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

解答

Python

class Solution:
    def arraySign(self, nums: List[int]) -> int:
        return 1 if reduce(lambda x, y: x * y, nums) > 0 else -1 if reduce(lambda x, y: x * y, nums) < 0 else 0

Ron ChenTue, May 2, 2023

Javascript

function arraySign(nums) {
  let count = 0;
  for (const num of nums) {
    if (num === 0) return 0;
    if (num < 0) count++;
  }

  if (count % 2 === 0) return 1;
  return -1;
}

MarsgoatTue, May 2, 2023

C#

public int ArraySign(int[] nums) {
    return nums.Aggregate(1, (dot, num) => dot * ((num >> 31) - ((-num) >> 31)));
}

JimWed, May 3, 2023

Reference

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