Day 4 solution.

2024-11-24 19:29:04 -05:00
parent 674175c5ea
commit d17bf4218b
2 changed files with 23 additions and 0 deletions
--- a/2015/days/day4.php
+++ b/2015/days/day4.php
@@ -0,0 +1,21 @@
+<?php
+
+function day4(int $part = 1) {
+  $key = 'bgvyzdsv';
+  $stop_value = 0;
+  for ($i = 0; $i < 10000000; $i++) {
+    $stop_value = $key . $i;
+    $md5 = md5($stop_value);
+    if ($part == 1) {
+      $identifier = '00000';
+    }
+    elseif ($part == 2) {
+      $identifier = '000000';
+    }
+    if (str_starts_with($md5, $identifier)) {
+      break;
+    }
+  }
+  return str_replace($key, '', $stop_value);
+}
+