diff --git a/app/models/problem.rb b/app/models/problem.rb
--- a/app/models/problem.rb
+++ b/app/models/problem.rb
@@ -61,6 +61,10 @@
     result[:total_sub] = Submission.where(problem_id: self.id).count
     result[:attempted_user] = Submission.where(problem_id: self.id).group_by(:user_id)
   end
+
+  def long_name
+    "[#{name}] #{full_name}"
+  end
   
   protected