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).

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

Approach

C++

#include <bits/stdc++.h>
using namespace std;

int arraySign(vector<int> &nums)
{

    int neg = 0;
    for (int i = 0; i < nums.size(); i++)
    {
        if (nums[i] == 0)
        {
            return 0;
        }
        else if (nums[i] < 0)
        {
            neg++;
        }
    }
    if (neg & 1)
        return -1;
    return 1;
}

int main()
{
    vector<int> nums = {-1, -2, -3, -4, 3, 2, 1};

    cout << arraySign(nums) << "\n";

    return 0;
}