MaximumValueOfStringInArray.php

<?php

namespace App;

/**
 * Maximum Value of a String in an Array
 *
 * The value of an alphanumeric string can be defined as:
 * - The numeric representation of the string in base 10, if it comprises of digits only.
 * - The length of the string, otherwise.
 * Given an array strs of alphanumeric strings, return the maximum value of any string in strs.
 *
 * Example 1:
 * Input: strs = ["alic3","bob","3","4","00000"]
 * Output: 5
 * Explanation:
 * - "alic3" consists of both letters and digits, so its value is its length, i.e. 5.
 * - "bob" consists only of letters, so its value is also its length, i.e. 3.
 * - "3" consists only of digits, so its value is its numeric equivalent, i.e. 3.
 * - "4" also consists only of digits, so its value is 4.
 * - "00000" consists only of digits, so its value is 0.
 * Hence, the maximum value is 5, of "alic3".
 *
 * Example 2:
 * Input: strs = ["1","01","001","0001"]
 * Output: 1
 * Explanation:
 * Each string in the array has value 1. Hence, we return 1.
 *
 * https://leetcode.com/problems/maximum-value-of-a-string-in-an-array
 */
class MaximumValueOfStringInArray
{
    /**
     * @param string[] $strs
     * @return int
     */
    public function maximumValue(array $strs): int
    {
        $max = PHP_INT_MIN;
        foreach ($strs as $str) {
            $value = $this->getValue($str);
            if ($value > $max) {
                $max = $value;
            }
        }
        return $max;
    }

    /**
     * @param string $str
     * @return int
     */
    private function getValue(string $str): int
    {
        if (is_numeric($str)) {
            return (int) $str;
        }
        return strlen($str);
    }
}