2441. Largest Positive Integer That Exists With Its Negative

2441. Largest Positive Integer That Exists With Its Negative

Easy

Given an integer array nums that does not contain any zeros, find the largest positive integer k such that -k also exists in the array.

Return the positive integer k. If there is no such integer, return -1.

Example 1:

• Input: nums = [-1,2,-3,3]
• Output: 3
• Explanation: 3 is the only valid k we can find in the array.

Example 2:

• Input: nums = [-1,10,6,7,-7,1]
• Output: 7
• Explanation: Both 1 and 7 have their corresponding negative values in the array. 7 has a larger value.

Example 3:

• Input: nums = [-10,8,6,7,-2,-3]
• Output: -1
• Explanation: There is no a single valid k, we return -1.

Constraints:

• 1 <= nums.length <= 1000
• -1000 <= nums[i] <= 1000
• nums[i] != 0

Solution:

class Solution {

    /**
     * @param Integer[] $nums
     * @return Integer
     */
    function findMaxK($nums) {
        $ans = -1;
        $seen = [];

        foreach ($nums as $num) {
            if (in_array(-$num, $seen)) {
                $ans = max($ans, abs($num));
            } else {
                array_push($seen, $num);
            }
        }

        return $ans;
    }
}

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