MaximumCountOfPositiveIntegerAndNegativeInteger.php

<?php

namespace App;

/**
 * Maximum Count of Positive Integer and Negative Integer
 *
 * Given an array nums sorted in non-decreasing order, return the maximum between the number of positive integers and
 * the number of negative integers. In other words, if the number of positive integers in nums is pos and the number of
 * negative integers is neg, then return the maximum of pos and neg. Note that 0 is neither positive nor negative.
 *
 * Example 1:
 * Input: nums = [-2,-1,-1,1,2,3]
 * Output: 3
 * Explanation: There are 3 positive integers and 3 negative integers. The maximum count among them is 3.
 *
 * Example 2:
 * Input: nums = [-3,-2,-1,0,0,1,2]
 * Output: 3
 * Explanation: There are 2 positive integers and 3 negative integers. The maximum count among them is 3.
 *
 * Example 3:
 * Input: nums = [5,20,66,1314]
 * Output: 4
 * Explanation: There are 4 positive integers and 0 negative integers. The maximum count among them is 4.
 *
 * https://leetcode.com/problems/maximum-count-of-positive-integer-and-negative-integer
 */
class MaximumCountOfPositiveIntegerAndNegativeInteger
{
    /**
     * @param int[] $nums
     * @return int
     */
    public function maximumCount(array $nums): int
    {
        $positive = 0;
        $negative = 0;
        foreach ($nums as $num) {
            if ($num > 0) {
                $positive++;
            } elseif ($num < 0) {
                $negative++;
            }
        }
        return max($positive, $negative);
    }
}