Leetcode PHP题解--D82 13. Roman to Integer

D82 13. Roman to Integer

Question link

13. Roman to Integer

Question Analysis

Convert the given Roman numerals to Arabic numerals.

Ideas

Use substitution method.

Be careful to replace those that appear consecutively first. For example, rather than replacing I first, replace III first. (php video tutorial)

Final code

<?php
class Solution {    /**
     * @param String $s
     * @return Integer
     */
    function romanToInt($s) {
        $ss = str_replace([&#39;CM&#39;,&#39;CD&#39;,&#39;XC&#39;,&#39;XL&#39;,&#39;IX&#39;,&#39;IV&#39;,&#39;M&#39;,&#39;D&#39;,&#39;C&#39;,&#39;L&#39;,&#39;X&#39;,&#39;V&#39;,&#39;I&#39;],[&#39;,900,&#39;,&#39;,400,&#39;,&#39;,90,&#39;,&#39;,40,&#39;,&#39;,9,&#39;,&#39;,4,&#39;,&#39;,1000,&#39;,&#39;,500,&#39;,&#39;,100,&#39;,&#39;,50,&#39;,&#39;,10,&#39;,&#39;,5,&#39;,&#39;,1,&#39;],$s);        return array_sum(array_filter(explode(&#39;,&#39;, $ss)));
    }
}

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