✨ Finit le jour 4

2022-12-06 10:12:35 +01:00
parent 1e84b70b7a
commit f0609cd245
2 changed files with 32 additions and 0 deletions
--- a/day_4/part_2.php
+++ b/day_4/part_2.php
@@ -0,0 +1,15 @@
+<?php
+
+$elves = explode("\n", file_get_contents('./input.txt'));
+
+echo count(
+    array_filter(
+        $elves,
+        static function($elf) {
+            [$section1, $section2] = array_map(static fn($section) => explode('-', $section), explode(',', $elf));
+            return count(
+                array_intersect(range($section1[0], $section1[1]), range($section2[0], $section2[1]))
+            ) > 0;
+        }
+    )
+);