44 lines
1.1 KiB
PHP
44 lines
1.1 KiB
PHP
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<?php
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// je récupère la map de base
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$map = array_map('str_split', explode("\n", file_get_contents('input.txt')));
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$height = count($map);
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$length = count($map[0]);
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// je la multiplie pour qu'elle soit complète
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$multiply_by = ceil($height / $length) * 8;
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array_walk($map, static function(&$row) use ($multiply_by) {
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$row = str_split(str_repeat(implode('', $row), $multiply_by));
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});
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$height = count($map);
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$length = count($map[0]);
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// je la visite et compte les arbres
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$tests = [
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['Right' => 1, 'down' => 1],
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['Right' => 3, 'down' => 1],
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['Right' => 5, 'down' => 1],
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['Right' => 7, 'down' => 1],
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['Right' => 1, 'down' => 2],
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];
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$result = 1;
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foreach ($tests as $i => $test) {
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$right = 0;
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$down = 0;
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$count_trees = 0;
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while ($right < $length && $down < $height) {
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if ($map[$down][$right] === '#') {
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$count_trees++;
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}
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$right += $test['Right'];
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$down += $test['down'];
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}
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// echo sprintf('Trouvé %u arbres sur le parcours %u', $count_trees, $i);
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$result *= $count_trees;
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}
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echo $result;
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