18 lines
469 B
PHP
18 lines
469 B
PHP
<?php
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$rucksacks = explode("\n", file_get_contents('./input.txt'));
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$lettersToNumbers = array_merge(range('a', 'z'), range('A', 'Z'));
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$groups = array_chunk($rucksacks, 3);
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echo array_sum(
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array_map(
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static function($rucksacks) use ($lettersToNumbers) {
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[$f, $s, $t] = array_map('str_split', $rucksacks);
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return array_search(current(array_intersect($f, $s, $t)), $lettersToNumbers, true) + 1;
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},
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$groups
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)
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);
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