47 lines
1.1 KiB
PHP
47 lines
1.1 KiB
PHP
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<?php
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$lines = explode("\n", file_get_contents('./input.txt'));
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$coolos = [];
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foreach ($lines as $line) {
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$chunks = [];
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$is_cool = true;
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foreach (str_split($line) as $chunk) {
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switch ($chunk) {
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case '(': $chunks[] = ')';break;
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case '[': $chunks[] = ']';break;
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case '{': $chunks[] = '}';break;
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case '<': $chunks[] = '>';break;
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default:
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$last_chunk = array_pop($chunks);
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if ($last_chunk !== $chunk) {
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$is_cool = false;
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break 2;
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}
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}
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}
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if ($is_cool) {
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$coolos[] = $chunks;
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}
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}
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$scores = [];
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foreach ($coolos as $remaining_chunks) {
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$remaining_chunks = array_reverse($remaining_chunks);
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$scores[] = array_reduce($remaining_chunks, static function ($carry, $chunk) {
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$additions = [
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')' => 1,
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']' => 2,
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'}' => 3,
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'>' => 4,
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];
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$carry *= 5;
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$carry += $additions[$chunk];
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return $carry;
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});
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}
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sort($scores);
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echo $scores[(int) floor(count($scores) / 2)];
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