25 lines
580 B
PHP
25 lines
580 B
PHP
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<?php
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$input = file_get_contents('input.txt');
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const WIDTH = 25;
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const HEIGHT = 6;
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$area = WIDTH * HEIGHT;
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$layers = array_map(static function($layer) {
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return str_split($layer);
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}, str_split($input, $area));
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usort($layers, function($layer_a, $layer_b) {
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$a0 = array_count_values($layer_a)['0'];
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$b0 = array_count_values($layer_b)['0'];
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if ($a0 === $b0) {
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return 0;
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}
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return $a0 < $b0 ? -1 : 1 ;
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});
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reset($layers);
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$fewest_0_layer = current($layers);
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echo array_count_values($fewest_0_layer)['1'] * array_count_values($fewest_0_layer)['2'];
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