34 lines
1.0 KiB
PHP
34 lines
1.0 KiB
PHP
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<?php
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[$columns, $movements] = explode("\n\n", file_get_contents('./input.txt'));
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$columns = parseColumns($columns);
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$movements = explode("\n", $movements);
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foreach ($movements as $movement) {
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preg_match('/^move (\d+) from (\d+) to (\d+)$/', $movement, $matches);
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[, $number, $from, $to] = $matches;
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$elements = array_splice($columns[$from], count($columns[$from]) - $number, $number);
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$columns[$to] = array_merge($columns[$to], $elements);
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}
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echo implode(array_map('array_pop', $columns));
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function parseColumns(string $columns)
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{
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$parsed_columns = [];
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$rows = array_map('str_split', explode("\n", $columns));
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array_unshift($rows, null);
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$rows = array_map(...$rows);
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$rows = array_map('array_reverse', $rows);
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foreach ($rows as $row) {
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$number = array_shift($row);
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if (!is_numeric($number) || empty($number)) {
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continue;
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}
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$parsed_columns[$number] = array_filter($row, fn($cell) => !empty(trim($cell)));
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}
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return $parsed_columns;
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}
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