From 15c6d8d79d9ec00a7abb14f90bd65547893c76f2 Mon Sep 17 00:00:00 2001
From: Marcin Chrzanowski <marcin.j.chrzanowski@gmail.com>
Date: Fri, 25 Dec 2020 15:25:06 +0100
Subject: Add day 9

---
 09/b.rb | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 09/b.rb

(limited to '09/b.rb')

diff --git a/09/b.rb b/09/b.rb
new file mode 100644
index 0000000..c95c1c9
--- /dev/null
+++ b/09/b.rb
@@ -0,0 +1,19 @@
+sum = 400480901
+lines = File.readlines('input.txt').map {|l| l.to_i}
+
+current_list = []
+current_sum = 0
+
+lines.each do |n|
+  current_sum += n
+  current_list.push n
+
+  while current_sum > sum && current_list.size > 1
+    current_sum -= current_list.first
+    current_list.shift
+  end
+
+  if current_sum == sum && current_list.size > 1
+    puts current_list.min + current_list.max
+  end
+end
-- 
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