58 lines
1.5 KiB
PHP
58 lines
1.5 KiB
PHP
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<?php
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[$instructions, $mine, $others] = explode("\n\n", file_get_contents('input.txt'));
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// parse instructions
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function parseInstructions($instructions)
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{
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// class: 1-3 or 5-7
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preg_match_all('/^[a-z]+: (\d+)-(\d+) or (\d+)-(\d+)$/mi', $instructions, $matches);
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if (count($matches) !== 5) {
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echo sprintf('Regex failed : %s', var_export($matches, true));
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exit;
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}
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$compares = [];
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array_shift($matches);
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for ($i = 0, $l = count($matches[0]); $i < $l; $i++) {
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$compares[] = static function ($number) use ($matches, $i) {
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$comparison = ($number >= (int)$matches[0][$i] and $number <= (int)$matches[1][$i])
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|| ($number >= (int)$matches[2][$i] and $number <= (int)$matches[3][$i]);
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if ($comparison === true) {
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return true;
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}
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return $number;
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};
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}
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return $compares;
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}
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$compares = parseInstructions($instructions);
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// check others
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$others = explode("\n", $others);
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array_shift($others);
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$others = array_map(static function($other) {
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return explode(',', $other);
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}, $others);
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$sum = 0;
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foreach ($others as $other) {
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foreach ($other as $number) {
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$is_valid = false;
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foreach ($compares as $compare) {
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if ($compare((int)$number) === true) {
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$is_valid = true;
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break;
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}
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}
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if (!$is_valid) {
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$sum += $number;
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echo sprintf('%u not in comparison list%s', $number, "\n");
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}
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}
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}
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// sum it up
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echo $sum;
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