1822. Sign of the Product of an Array

Easy

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

解題

func arraySign(nums []int) int {
    neg := 0

    for _, n := range nums {
        if n == 0 { return 0 }
        if n < 0 { neg++ }
    }

    if neg % 2 == 0 {
        return 1
    } 

    return -1
}