Day6

FailedCode · FailedCode · commit 4c745609d83b · 2022-12-09T21:45:16.000+01:00
diff --git a/src/Days/Day6.php b/src/Days/Day6.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace Failedcode\Aoc2022\Days;
+
+class Day6 extends AbstractDay
+{
+    public function solve_part_1(): string
+    {
+        $input = $this->util->loadInput(6)[0];
+        return $this->getSignalLengthPosition($input, 4);
+    }
+
+    public function solve_part_2(): string
+    {
+        $input = $this->util->loadInput(6)[0];
+        return $this->getSignalLengthPosition($input, 14);
+    }
+
+    protected function getSignalLengthPosition($input, $signalLength)
+    {
+        for($i = 0; $i < $signalLength; $i += 1) {
+            $signals[] = substr($input, $i, 1);
+        }
+        for($i = $signalLength; $i < strlen($input); $i += 1) {
+            if (count(array_unique($signals)) === $signalLength) {
+                return $i;
+            }
+            $signals[] = substr($input, $i, 1);
+            array_shift($signals);
+        }
+        return "Error: no position found";
+    }
+}
