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
}