41 lines
1.1 KiB
PHP
41 lines
1.1 KiB
PHP
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<?php
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// parse tree
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$possible_bags = [];
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$rules = explode("\n", file_get_contents('input.txt'));
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foreach ($rules as $rule) {
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[$current_bag, $inside_bags] = explode(' contain ', $rule);
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$current_bag = substr($current_bag, 0, -5);
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if ($inside_bags === 'no other bags.') {
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$possible_bags[$current_bag] = [];
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} else {
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$inside_bags = explode(', ', $inside_bags);
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$parsed_inside_bags = [];
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foreach ($inside_bags as $inside_bag) {
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preg_match ('/\d+ (.*) bags?\.?/uU', $inside_bag, $bag);
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$parsed_inside_bags[] = $bag[1];
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}
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$possible_bags[$current_bag] = $parsed_inside_bags;
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}
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}
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function has_shiny_in($total_list, $shiny_list = ['shiny gold'])
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{
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$at_least_one_add = false;
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foreach ($total_list as $bag => $item) {
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if (!in_array($bag, $shiny_list, true) && count(array_intersect($shiny_list, $item)) > 0) {
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$at_least_one_add = true;
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$shiny_list[] = $bag;
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}
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}
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if ($at_least_one_add) {
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return has_shiny_in($total_list, $shiny_list);
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}
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return $shiny_list;
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}
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var_dump(has_shiny_in($possible_bags));
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