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# 題目敘述

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

class Solution {
public:
    int arraySign(vector<int>& nums) {
        int sign = 1;
        for (int n : nums) {
            if (n == 0) return 0;
            if (n < 0) sign *= -1;
        }
        if (sign > 0) return 1;
        else return -1;
    }
};
class Solution {
    public int arraySign(int[] nums) {
        int sign = 1;
        for (int n : nums) {
            if (n == 0) return 0;
            if (n < 0) sign *= -1;
        }
        return sign > 0 ? 1 : -1;
    }
}
class Solution:
    def arraySign(self, nums: List[int]) -> int:
        sign = 1
        for n in nums:
            if n == 0: return 0
            if n < 0: sign *= -1
        return 1 if sign > 0 else -1