diff --git a/script/contest_grade_prob.rb b/script/contest_grade_prob.rb
new file mode 100644
--- /dev/null
+++ b/script/contest_grade_prob.rb
@@ -0,0 +1,47 @@
+#!/usr/bin/env ruby
+
+APP_PATH = File.expand_path('../../config/application',  __FILE__)
+require File.expand_path('../../config/boot',  __FILE__)
+require APP_PATH
+
+# set Rails.env here if desired
+Rails.application.require_environment!
+
+def main
+  if ARGV.length != 1
+    puts "Usage: contest_grade_prob.rb [problem_name]"
+    exit(0)
+  end
+
+  problem_name = ARGV[0]
+  problem = Problem.where(:name => problem_name).first
+  if !problem
+    puts "Problem not found"
+    exit(0)
+  end
+
+  problem.full_score = 100
+  problem.save
+
+  test_pair = TestPair.get_for(problem, true)
+  
+  User.all.each do |u|
+    puts "#{u.login}:"
+    submissions = Submission.find_all_by_user_problem(u.id, problem.id)
+    submissions.each do |sub|
+      result = test_pair.grade(sub.output)
+      result2 = test_pair.grade(sub.source)
+      if result2[:score] > result[:score]
+        result = result2
+        puts "Use source field (#{sub.id})"
+      end
+
+      full_score = result[:full_score]
+      sub.points = result[:score]*100 / full_score
+      sub.grader_comment = result[:msg]
+      sub.save
+    end
+  end
+end
+
+main