solved part 1

2021-11-10 14:01:05 -05:00 · 2021-11-10 14:01:05 -05:00 · 536f505093
parent 7044bcdc23
commit 536f505093
1 changed files with 13 additions and 0 deletions
--- a/day02/solution.rb
+++ 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]
+