9 lines
218 B
PHP
9 lines
218 B
PHP
<?php
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$instruction = file_get_contents(__DIR__.'/input.txt');
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preg_match_all('/mul\((\d+),(\d+)\)/', $instruction, $muls, PREG_SET_ORDER);
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echo array_sum(array_map(static fn($mul) => $mul[1]*$mul[2], $muls));
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exit;
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