MinimumCommonValue.php

<?php

namespace App;

/**
 * Minimum Common Value
 *
 * Given two integer arrays nums1 and nums2, sorted in non-decreasing order, return the minimum integer common to both
 * arrays. If there is no common integer amongst nums1 and nums2, return -1. Note that an integer is said to be common
 * to nums1 and nums2 if both arrays have at least one occurrence of that integer.
 *
 * Example 1:
 * Input: nums1 = [1,2,3], nums2 = [2,4]
 * Output: 2
 * Explanation: The smallest element common to both arrays is 2, so we return 2.
 *
 * Example 2:
 * Input: nums1 = [1,2,3,6], nums2 = [2,3,4,5]
 * Output: 2
 * Explanation: There are two common elements in the array 2 and 3 out of which 2 is the smallest, so 2 is returned.
 *
 * https://leetcode.com/problems/minimum-common-value
 */
class MinimumCommonValue
{
    /**
     * @param int[] $nums1
     * @param int[] $nums2
     * @return int
     */
    public function getCommon(array $nums1, array $nums2): int
    {
        $hashNums1 = [];
        foreach ($nums1 as $num1) {
            $hashNums1[$num1] = true;
        }
        foreach ($nums2 as $num2) {
            if (isset($hashNums1[$num2])) {
                return $num2;
            }
        }
        return -1;
    }
}