100 lines
3.4 KiB
PHP
100 lines
3.4 KiB
PHP
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<?php
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$entries = explode("\n", file_get_contents('./input.txt'));
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$outputs = [];
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foreach ($entries as $entry) {
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[$uniques, $output] = explode('|', $entry);
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$uniques = array_filter(explode(' ', $uniques));
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$output = array_filter(explode(' ', $output));
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$mapping = [];
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while (count($mapping) !== 10) {
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foreach ($uniques as $unique) {
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$unique = sort_string($unique);
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if (in_array($unique, $mapping)) {
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continue;
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}
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switch (strlen($unique)) {
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case 2: $mapping[1] = $unique; break;
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case 4: $mapping[4] = $unique; break;
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case 3: $mapping[7] = $unique; break;
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case 7: $mapping[8] = $unique; break;
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case 5:
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if (array_key_exists(1, $mapping)) {
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$segments_1 = str_split($mapping[1]);
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if (str_contains($unique, $segments_1[0]) && str_contains($unique, $segments_1[1])) {
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$mapping[3] = $unique;
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break;
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}
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}
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if (array_key_exists(9, $mapping)) {
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$segments_9 = str_split($mapping[9]);
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$count = 0;
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foreach ($segments_9 as $segment_9) {
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if (!str_contains($unique, $segment_9)) {
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$count++;
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}
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}
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if ($count === 1) {
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$mapping[5] = $unique;
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break;
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} else {
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$mapping[2] = $unique;
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break;
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}
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}
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break;
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case 6:
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if (array_key_exists(1, $mapping)) {
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$segments_1 = str_split($mapping[1]);
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if (!str_contains($unique, $segments_1[0]) || !str_contains($unique, $segments_1[1])) {
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$mapping[6] = $unique;
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break;
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}
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}
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if (array_key_exists(4, $mapping)) {
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$segments_4 = str_split($mapping[4]);
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if (
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str_contains($unique, $segments_4[0]) &&
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str_contains($unique, $segments_4[1]) &&
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str_contains($unique, $segments_4[2]) &&
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str_contains($unique, $segments_4[3])
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) {
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$mapping[9] = $unique;
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break;
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}
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}
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if (array_key_exists(6, $mapping) && array_key_exists(9, $mapping)) {
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$mapping[0] = $unique;
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break;
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}
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break;
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default:
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echo 'unknown length : '.strlen($unique);
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}
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}
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}
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$number = '';
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foreach ($output as $item) {
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$item = sort_string($item);
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$number .= array_search($item, $mapping);
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}
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echo sprintf('%u%s', $number, "\n");
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$outputs[] = (int) $number;
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}
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echo array_sum($outputs);
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function sort_string(string $string)
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{
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$string = str_split($string);
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sort($string);
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return implode($string);
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}
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