NumberOfLinesToWriteString.php

<?php

namespace App;

/**
 * Number of Lines To Write String
 *
 * You are given a string s of lowercase English letters and an array widths denoting how many pixels wide each
 * lowercase English letter is. Specifically, widths[0] is the width of 'a', widths[1] is the width of 'b', and so on.
 * You are trying to write s across several lines, where each line is no longer than 100 pixels. Starting at the
 * beginning of s, write as many letters on the first line such that the total width does not exceed 100 pixels. Then,
 * from where you stopped in s, continue writing as many letters as you can on the second line. Continue this process
 * until you have written all of s.
 * Return an array result of length 2 where:
 * result[0] is the total number of lines.
 * result[1] is the width of the last line in pixels.
 *
 * Example 1:
 * Input: widths = [10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10],
 * s = "abcdefghijklmnopqrstuvwxyz"
 * Output: [3,60]
 * Explanation: You can write s as follows:
 * abcdefghij  // 100 pixels wide
 * klmnopqrst  // 100 pixels wide
 * uvwxyz      // 60 pixels wide
 * There are a total of 3 lines, and the last line is 60 pixels wide.
 *
 * https://leetcode.com/problems/number-of-lines-to-write-string
 */
class NumberOfLinesToWriteString
{
    /**
     * @param array<array-key, int> $widths
     * @param string $s
     * @return array
     */
    public function numberOfLines(array $widths, string $s): array
    {
        $index = 0;
        $line = 1;
        $widthSumma = 0;
        while ($index < strlen($s)) {
            $letterWidth = $widths[ord($s[$index]) - 97];
            $widthSumma += $letterWidth;
            $index++;
            if ($widthSumma > 100) {
                $widthSumma = 0;
                $index--;
                $line++;
            }
        }
        return [$line, $widthSumma];
    }
}