Add day2

2023-12-03 13:56:47 +01:00
parent 7114143113
commit f4e0e3b8e2
4 changed files with 218 additions and 0 deletions
--- a/src/Y23/Day2.php
+++ b/src/Y23/Day2.php
@ -0,0 +1,108 @@
+<?php
+
+namespace trizz\AdventOfCode\Y23;
+
+use trizz\AdventOfCode\Solution;
+
+final class Day2 extends Solution
+{
+    public static null|int|string $part1ExampleResult = 8;
+
+    public static null|int|string $part1Result = 2810;
+
+    public static null|int|string $part2ExampleResult = 2286;
+
+    public static null|int|string $part2Result = 69110;
+
+    /**
+     * @var array<string, array<string, int>>
+     */
+    private static array $colorData = [
+        'red' => ['max' => 12],
+        'green' => ['max' => 13],
+        'blue' => ['max' => 14],
+    ];
+
+    #[\Override]
+    public function part1(array $data): int
+    {
+        $score = 0;
+        foreach ($data as $line) {
+            [$gameId, $hands] = $this->getHand($line);
+            $validGame = true;
+            foreach ($hands as $hand) {
+                if ($this->isValidHand($hand)) {
+                    continue;
+                }
+
+                $validGame = false;
+            }
+
+            if ($validGame) {
+                $score += (int) $gameId;
+            }
+        }
+
+        return (int) $score;
+    }
+
+    #[\Override]
+    public function part2(array $data): int
+    {
+        $score = 0;
+        foreach ($data as $line) {
+            [$gameId, $hands] = $this->getHand($line);
+            $handData = ['red' => 0, 'green' => 0, 'blue' => 0];
+            foreach ($hands as $hand) {
+                $colorsInHand = $this->extractColors($hand);
+                foreach ($handData as $color => $value) {
+                    if (($colorsInHand[$color] ?? 0) > $value) {
+                        $handData[$color] = $colorsInHand[$color];
+                    }
+                }
+            }
+
+            $score += array_product($handData);
+        }
+
+        return (int) $score;
+    }
+
+    /**
+     * @return array<int, array<int, string>>
+     */
+    private function getHand(string $line): array
+    {
+        [$gameId, $gameData] = explode(':', $line, 2);
+        [$_, $gameId] = explode(' ', $gameId);
+
+        $hands = explode(';', $gameData);
+
+        return [$gameId, $hands];
+    }
+
+    /**
+     * @return array<string, int>
+     */
+    private function extractColors(string $hand): array
+    {
+        $colors = [];
+        foreach (explode(',', $hand) as $part) {
+            [$number, $color] = explode(' ', trim($part));
+            $colors[$color] = (int) $number;
+        }
+
+        return $colors;
+    }
+
+    private function isValidHand(string $hand): bool
+    {
+        $lineData = ['red' => 0, 'green' => 0, 'blue' => 0];
+        foreach (explode(',', $hand) as $part) {
+            [$number, $color] = explode(' ', trim($part));
+            $lineData[$color] += (int) $number;
+        }
+
+        return !($lineData['red'] > self::$colorData['red']['max'] || $lineData['green'] > self::$colorData['green']['max'] || $lineData['blue'] > self::$colorData['blue']['max']);
+    }
+}