1 files changed, 34 insertions, 0 deletions
diff --git a/day02/part1.rb b/day02/part1.rb
new file mode 100644
index 0000000..150ee75
--- /dev/null
+++ b/day02/part1.rb
@@ -0,0 +1,34 @@
+def play(them, us)
+  us + case them
+  when 1
+    case us
+    when 1; 3
+    when 2; 6
+    when 3; 0
+    end
+  when 2
+    case us
+    when 1; 0
+    when 2; 3
+    when 3; 6
+    end
+  when 3
+    case us
+    when 1; 6
+    when 2; 0
+    when 3; 3
+    end
+  end
+end
+
+rounds = $stdin.readlines.map(&:strip).map(&:split)
+
+score = 0
+
+rounds.each do |them, us|
+  ti = {?A => 1, ?B => 2, ?C => 3}[them]
+  ui = {?X => 1, ?Y => 2, ?Z => 3}[us]
+  score += play(ti, ui)
+end
+
+puts score