1822. 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).

• new solution update 2022.02.08

class Solution {
public:
    int arraySign(vector<int>& nums) {
        int res = 1;
        for(int n :nums) {
            if(n == 0) return 0;
            else if(n < 0) res = -res;
        }
        return res;
    }
};

class Solution {
public:
    int arraySign(vector<int>& nums) {
        bool flag = true;
        for(auto& num : nums) {
            if(num < 0)
                flag ^= true;
            if(!num)
                return 0;
        }

        return flag ? 1 : -1;
    }
};