From fab0464298d93df8f704ab750ee71f90a3203de0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment?= <clement@desmidt.fr>
Date: Fri, 11 Dec 2020 12:17:57 +0100
Subject: [PATCH] :construction: Commence le jour 10

---
 day_10/part_1.php | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 day_10/part_1.php

diff --git a/day_10/part_1.php b/day_10/part_1.php
new file mode 100644
index 0000000..d78d377
--- /dev/null
+++ b/day_10/part_1.php
@@ -0,0 +1,29 @@
+<?php
+
+$numbers = array_map('intval', explode("\n", file_get_contents('input.txt')));
+
+sort($numbers);
+
+$difference_of_1 = 0;
+$difference_of_3 = 0;
+
+$current_jolt = 0;
+
+while($current_jolt < max($numbers)) {
+    if (in_array($current_jolt + 1, $numbers, true)) {
+        $current_jolt++;
+        $difference_of_1++;
+        continue;
+    }
+    if (in_array($current_jolt + 3, $numbers, true)) {
+        $current_jolt += 3;
+        $difference_of_3++;
+        continue;
+    }
+}
+
+// your device's built-in adapter is always 3 higher than the highest adapter
+$difference_of_3++;
+$current_jolt += 3;
+
+echo $difference_of_1 * $difference_of_3;
\ No newline at end of file