Add day 2

2021-12-02 09:19:03 +01:00
parent de974a9890
commit 46833e668a
7 changed files with 1187 additions and 0 deletions
--- a/src/Day2.php
+++ b/src/Day2.php
@ -0,0 +1,87 @@
+<?php
+
+namespace AdventOfCode21;
+
+class Day2 extends AbstractCommand
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected static int $day = 2;
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function part1(array $data): int
+    {
+        $depth = 0;
+        $horizontal = 0;
+
+        /** @var string $current */
+        foreach ($data as $current) {
+            /**
+             * @var string $direction
+             * @var int    $distance
+             */
+            [$direction, $distance] = explode(' ', $current);
+
+            switch ($direction) {
+                case 'forward':
+                    $horizontal += $distance;
+
+                    break;
+
+                case 'down':
+                    $depth += $distance;
+
+                    break;
+
+                case 'up':
+                    $depth -= $distance;
+
+                    break;
+            }
+        }
+
+        return $depth * $horizontal;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function part2(array $data): int
+    {
+        $aim = 0;
+        $depth = 0;
+        $horizontal = 0;
+
+        /** @var string $current */
+        foreach ($data as $current) {
+            /**
+             * @var string $direction
+             * @var int    $distance
+             */
+            [$direction, $distance] = explode(' ', $current);
+
+            switch ($direction) {
+                case 'forward':
+                    $horizontal += $distance;
+                    $depth += $distance * $aim;
+
+                    break;
+
+                case 'down':
+                    $aim += $distance;
+
+                    break;
+
+                case 'up':
+                    $aim -= $distance;
+
+                    break;
+            }
+        }
+
+        return $horizontal * $depth;
+    }
+}