1 files changed, 19 insertions, 0 deletions
diff --git a/06/b.rb b/06/b.rb
new file mode 100644
index 0000000..aa29c00
--- /dev/null
+++ b/06/b.rb
@@ -0,0 +1,19 @@
+groups = File.read('input.txt').split("\n\n")
+
+total = groups.reduce(0) do |total, group|
+  answers = group.split("\n")
+  
+  all = answers.reduce(Hash.new true) do |all, answer|
+    new_all = {}
+    answer.each_char do |c|
+      if all[c]
+        new_all[c] = true
+      end
+    end
+    new_all
+  end
+  subtotal = all.size
+  total + subtotal
+end
+
+puts total