16 lines
416 B
PHP
16 lines
416 B
PHP
<?php
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$lines = array_map('str_split', explode("\n", file_get_contents('input.txt')));
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$lines = array_map('array_reverse', array_map(null, ...$lines)); // matrix rotation
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$gamma = '';
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$epsilon = '';
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foreach ($lines as $line) {
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$counts = array_count_values($line);
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$max = array_search(max($counts), $counts);
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$gamma .= $max;
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$epsilon .= $max === 1 ? 0 : 1;
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}
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echo bindec($gamma) * bindec($epsilon); |