LeetCode1822. Sign of the Product of an Array

一、题目

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

二、题解

class Solution {
public:
    int arraySign(vector<int>& nums) {
        int flag = 1;
        for(auto x:nums){
            if(x == 0){
                flag = 0;
                break;
            }
            else if(x < 0) flag *= -1;
        }
        return flag;
    }
};