37 lines
989 B
PHP
37 lines
989 B
PHP
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<?php
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$input = explode("\n", file_get_contents('day5.input'));
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$empty = array_search('', $input, true);
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$stackDescriptions = array_slice($input, 0, $empty - 1);
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$commands = array_slice($input, $empty + 1);
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$numbers = array_filter(explode(' ', $input[$empty - 1]));
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$stacks = [];
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foreach($numbers as $number) {
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$stacks[$number] = [];
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}
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foreach ($stackDescriptions as $line) {
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$items = array_map(fn ($str) => trim($str, '[] '), str_split($line, 4));
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$crates = array_combine($numbers, $items);
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foreach ($crates as $stack => $crate) {
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if ($crate !== '') {
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array_unshift($stacks[$stack], $crate);
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}
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}
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}
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foreach ($commands as $command) {
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preg_match('/move (\d+) from (\d+) to (\d+)/', $command, $matches);
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[$x, $count, $from, $to] = $matches;
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for ($i = 0; $i < $count; $i++) {
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array_push($stacks[$to], array_pop($stacks[$from]));
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}
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}
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$result = implode('', array_map('end', $stacks));
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echo 'Top crates: ' . $result;
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