21 lines
483 B
PHP
21 lines
483 B
PHP
<?php
|
|
|
|
$list_1 = [];
|
|
$list_2 = [];
|
|
|
|
$lines = array_filter(explode("\n", file_get_contents(__DIR__.'/input.txt')), static fn($line) =>!empty($line));
|
|
|
|
foreach ($lines as $line) {
|
|
[$a, $b] = explode(" ", $line);
|
|
$list_1[] = $a;
|
|
$list_2[] = $b;
|
|
}
|
|
|
|
$similarity_score = 0;
|
|
|
|
$count_list_2 = array_count_values($list_2);
|
|
foreach ($list_1 as $item) {
|
|
$similarity_score += array_key_exists($item, $count_list_2) ? $count_list_2[$item] * $item : 0;
|
|
}
|
|
|
|
echo $similarity_score; |