44 lines
1.3 KiB
PHP
44 lines
1.3 KiB
PHP
<?php
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$input_file = '../inputs/day6.txt';
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if (file_exists($input_file)) {
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$input = file_get_contents($input_file);
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if ($input != null) {
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$answer_groups = explode("\n", $input);
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print 'Part 1 answer: ' . solve_part_one($answer_groups) . "\n";
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print 'Part 2 answer: ' . solve_part_two($answer_groups) . "\n";
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}
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}
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function solve_part_one(array $answer_groups): int
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{
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$solve_1 = fn ($form) => strlen(implode('', array_unique(str_split(implode('', $form)))));
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return parse_declaration_forms_and_solve($answer_groups, $solve_1);
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}
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function solve_part_two(array $answer_groups): int
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{
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$solve_2 = fn ($form) => count(call_user_func_array('array_intersect', array_map(fn ($str) => str_split($str), $form)));
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return parse_declaration_forms_and_solve($answer_groups, $solve_2);
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}
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function parse_declaration_forms_and_solve(array $answer_groups, callable $fn): int
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{
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$current_answers = [];
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$ret = 0;
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for ($i = 0; $i < count($answer_groups); $i++) {
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$answer = trim($answer_groups[$i]);
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if ($answer == '') {
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$ret += $fn(array_map(fn ($val) => trim($val), $current_answers));
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$current_answers = [];
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} else
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$current_answers[] = $answer;
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}
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if (count($current_answers) != 0)
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$ret += $fn(array_map(fn ($val) => trim($val), $current_answers));
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return $ret;
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}
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