20 lines
409 B
PHP
20 lines
409 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[] = $b;
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}
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sort($list_1); sort($list_2);
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$total = 0;
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for ($i=0, $l=count($list_1); $i < $l; $i++) {
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$total += abs($list_1[$i] - $list_2[$i]);
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}
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echo $total;
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