From 4ff438de363c14510670727da366c35a0a3820bf Mon Sep 17 00:00:00 2001
From: Alexander Munch-Hansen <alexmunchhansen@gmail.com>
Date: Tue, 19 Dec 2017 02:43:23 +0100
Subject: [PATCH] 11th day

---
 hexagons.rb | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 hexagons.rb

diff --git a/hexagons.rb b/hexagons.rb
new file mode 100644
index 0000000..ce056a1
--- /dev/null
+++ b/hexagons.rb
@@ -0,0 +1,21 @@
+require 'matrix'
+input = File.read("input_11.rb").strip.split(",").map(&:to_sym)
+HEX_DIRS = {
+  :n => Vector[0,1,-1], :ne => Vector[-1,1,0],
+  :se => Vector[-1,0,1], :s => Vector[0,-1,1],
+  :sw => Vector[1,-1,0], :nw => Vector[1,0,-1]  
+}
+
+def dist path
+
+  path.reduce({:vec => Vector[0,0,0], :lol => 0}) do |mem,step|
+    mem[:vec]= new = mem[:vec] + HEX_DIRS[step]
+    mem[:lol] = [new.map(&:abs).sum / 2, mem[:lol]].max
+    mem
+  end
+end
+
+out = dist input
+p out[:vec].map(&:abs).sum / 2, out[:lol]
+
+