Add 2022 and 2023

1 files changed, 63 insertions, 0 deletions

diff --git a/2022/day3.rb b/2022/day3.rb
new file mode 100644
index 0000000..5b6b0f7
--- /dev/null
+++ b/2022/day3.rb
@@ -0,0 +1,63 @@
+require 'set'
+
+def split_in_half(s)
+  pivot = s.length/2
+  return [s[0, pivot], s[pivot, s.length]]
+end
+
+def shared_item(s)
+  rucksack1, rucksack2 = split_in_half(s)
+  tmp = (rucksack1.chars.to_set & rucksack2.chars.to_set)
+  puts tmp
+  return tmp.first
+end
+
+def scores_hash
+  a = ('a'..'z').zip((1..26)) + ('A'..'Z').zip((27..52))
+  a.to_h
+end
+
+TEST_S = <<-EOC
+vJrwpWtwJgWrhcsFMMfFFhFp
+jqHRNqRjqzjGDLGLrsFMfFZSrLrFZsSL
+PmmdzqPrVvPwwTWBwg
+wMqvLMZHhHMvwLHjbvcjnnSBnvTQFn
+ttgJtRGJQctTZtZT
+CrZsJsPPZsGzwwsLwLmpwMDw
+EOC
+
+def test_1(s)
+  s.lines.map do |line|
+    item = shared_item(line)
+    scores_hash[item]
+  end.sum
+end
+
+def day1
+
+  puts test_1(TEST_S)
+
+  File.open('./day3.txt') do |f|
+    retval = f.readlines.map do |line|
+      item = shared_item(line)
+      scores_hash[item]
+    end
+    puts retval.sum
+  end
+end
+
+require './utils'
+
+def day2
+  badges = []
+  File.open('./day3.txt') do |f|
+
+    f.readlines.each_n(3) do |a,b,c|
+      badge = a.chars.to_set & b.chars.to_set & c.chars.to_set
+      badges << scores_hash[badge.first]
+    end
+  end
+  puts badges.sum
+end
+
+day2()