From e79b0344fdfe165480715a6c465de396c583112a Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Sat, 5 Dec 2020 21:15:22 -0800
Subject: [PATCH] Add initial day6 solution.

---
 day6.cr | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 day6.cr

diff --git a/day6.cr b/day6.cr
new file mode 100644
index 0000000..df73ee9
--- /dev/null
+++ b/day6.cr
@@ -0,0 +1,21 @@
+require "advent"
+INPUT = input(2020, 6).split("\n\n")
+
+def part1
+  input = INPUT.clone
+  answers = input.map do |i|
+    i.chars.uniq!.count &.ascii_letter?
+  end
+  puts answers.sum
+end
+
+def part2
+  input = INPUT.clone
+  sol = input.map do |i|
+    i.split("\n").reject(&.empty?).map(&.chars.to_set).reduce { |s1, s2| s1 & s2 }
+  end
+  puts(sol.map(&.size).sum)
+end
+
+part1
+part2