67 lines
1.6 KiB
PHP
67 lines
1.6 KiB
PHP
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<?php
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namespace trizz\AdventOfCode\Y22;
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use trizz\AdventOfCode\Solution;
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final class Day3 extends Solution
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{
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public static null|int|string $part1ExampleResult = 157;
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public static null|int|string $part1Result = 8053;
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public static null|int|string $part2ExampleResult = 70;
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public static null|int|string $part2Result = 2425;
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/**
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* @param array<int, string> $data
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*/
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#[\Override]
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public function part1(array $data): int
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{
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$result = 0;
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foreach ($data as $rucksack) {
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/** @var int<1, max> $length */
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$length = max(1, strlen($rucksack) / 2);
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[$left, $right] = str_split($rucksack, $length);
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$result += $this->calculateScore([str_split($left), str_split($right)]);
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}
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return $result;
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}
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/**
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* @param array<int, string> $data
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*/
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#[\Override]
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public function part2(array $data): int
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{
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$result = 0;
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$groups = array_chunk($data, 3);
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foreach ($groups as $group) {
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$data = array_map(static fn ($items): array => str_split((string) $items), $group);
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$result += $this->calculateScore($data);
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}
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return $result;
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}
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/**
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* @param array<array<int, string>> $data
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*/
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private function calculateScore(array $data = []): int
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{
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$items = array_unique(array_intersect(...$data));
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$result = 0;
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foreach ($items as $item) {
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$position = ord(strtoupper($item)) - ord('A') + 1;
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$result += $position + (ctype_upper($item) ? 26 : 0);
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}
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return $result;
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}
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}
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