day 2

day02.rb

@@ -0,0 +1,27 @@
+lines = STDIN.read.split("\n")
+
+part1 = 0
+part2 = 0
+
+input = lines.map do |line|
+  theirs = line[0].ord - 'A'.ord
+  ours = line[2].ord - 'X'.ord
+
+  part1 += ours + 1
+
+  if ours == theirs then
+    part1 += 3
+  elsif (theirs + 1) % 3 == ours then
+    part1 += 6
+  end
+
+  if ours == 0 then
+    part2 += (theirs - 1) % 3 + 1
+  elsif ours == 1 then
+    part2 += theirs + 3 + 1
+  else
+    part2 += (theirs + 1) % 3 + 6 + 1
+  end
+end
+
+puts part1, part2