From ae26a072fb9d90ad27238ea75004166d17521ed0 Mon Sep 17 00:00:00 2001
From: Marcin Chrzanowski <marcin.j.chrzanowski@gmail.com>
Date: Fri, 25 Dec 2020 15:19:04 +0100
Subject: Add day 6

---
 06/a.rb | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 06/a.rb

(limited to '06/a.rb')

diff --git a/06/a.rb b/06/a.rb
new file mode 100644
index 0000000..2dd7de3
--- /dev/null
+++ b/06/a.rb
@@ -0,0 +1,16 @@
+groups = File.read('input.txt').split("\n\n")
+
+total = groups.reduce(0) do |total, group|
+  answers = group.split("\n")
+  
+  anyone = answers.reduce(Hash.new false) do |anyone, answer|
+    answer.each_char do |c|
+      anyone[c] = true
+    end
+    anyone
+  end
+  subtotal = anyone.size
+  total + subtotal
+end
+
+puts total
-- 
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