✨ Finit le jour 6

day_6/part_1.php

@@ -0,0 +1,10 @@
+<?php
+
+$buffer = str_split(file_get_contents('./input.txt'));
+
+for ($start = 0, $max = count($buffer); $start < $max; $start++) {
+    $slice = array_slice($buffer, $start, 4);
+    if (count(array_unique($slice)) === 4) {
+        echo $start + 4; exit;
+    }
+}

day_6/part_2.php

@@ -0,0 +1,10 @@
+<?php
+
+$buffer = str_split(file_get_contents('./input.txt'));
+
+for ($start = 0, $max = count($buffer); $start < $max; $start++) {
+    $slice = array_slice($buffer, $start, 14);
+    if (count(array_unique($slice)) === 14) {
+        echo $start + 14; exit;
+    }
+}