From f5660e89387ab0e0e63edb3d0961f26ac543be43 Mon Sep 17 00:00:00 2001
From: Alpha Chen <alpha@kejadlen.dev>
Date: Sat, 5 Dec 2020 21:07:58 -0800
Subject: [PATCH] [2020][ruby][6.x]

---
 2020/ruby/day_06.rb | 6 ++++++
 1 file changed, 6 insertions(+)
 create mode 100644 2020/ruby/day_06.rb

diff --git a/2020/ruby/day_06.rb b/2020/ruby/day_06.rb
new file mode 100644
index 0000000..a4f0a32
--- /dev/null
+++ b/2020/ruby/day_06.rb
@@ -0,0 +1,6 @@
+# p ARGF.read.split("\n\n").map {|g| g.gsub("\n", "").chars.uniq.count }.sum
+p ARGF.read.split("\n\n").map {|group|
+  people = group.split("\n").map(&:chars)
+  first = people.shift
+  first.count {|answer| people.all? {|answers| answers.include?(answer) }}
+}.sum