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