1822. 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

 

Constraints:

  • 1 <= nums.length <= 1000
  • -100 <= nums[i] <= 100

Rust Solution

struct Solution;

impl Solution {
    fn array_sign(nums: Vec<i32>) -> i32 {
        nums.into_iter().map(|x| x.signum()).product()
    }
}

#[test]
fn test() {
    let nums = vec![-1, -2, -3, -4, 3, 2, 1];
    let res = 1;
    assert_eq!(Solution::array_sign(nums), res);
    let nums = vec![1, 5, 0, 2, -3];
    let res = 0;
    assert_eq!(Solution::array_sign(nums), res);
    let nums = vec![-1, 1, -1, 1, -1];
    let res = -1;
    assert_eq!(Solution::array_sign(nums), res);
}

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