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