1822. Sign of the Product of an Array

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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

# 解題思路

# Solution

class Solution {

    public int arraySign(int[] nums) {

        int sign = 1;

        for(int num : nums){

            if(num == 0) return 0;

            if(num < 0) sign *= -1;

        }

        return sign;

    }

}