From 536f50509309a825a1bdfda5ed3fdf9a4b7000cf Mon Sep 17 00:00:00 2001
From: s00ner <s00ner@doublehack.me>
Date: Wed, 10 Nov 2021 14:01:05 -0500
Subject: [PATCH] solved part 1

---
 day02/solution.rb | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 day02/solution.rb

diff --git a/day02/solution.rb b/day02/solution.rb
new file mode 100644
index 0000000..282200e
--- /dev/null
+++ b/day02/solution.rb
@@ -0,0 +1,13 @@
+#!/bin/env ruby
+
+ids = File.readlines('./input').map(&:strip)
+checksum = {twos: 0, threes: 0}
+
+ids.map! { |id| id.each_char.tally.delete_if { |char, count| count==1 }}
+ids.each do |id|
+    checksum[:twos] += 1 if id.has_value?(2)
+    checksum[:threes] += 1 if id.has_value?(3)
+end
+
+puts checksum[:twos] * checksum[:threes]
+