Leetcode PHP题解--D82 13. Roman to Integer

D82 13. Roman to Integer

Topic Link

13. Roman to Integer

Topic analysis

Given Roman numerals converted to Arabic numerals.

Thinking

With the substitution.

Note that the first replacement of those consecutive. For example, compared with the first replacement I, the replacement first III.

The final code

<?php
class Solution {

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