diff --git a/.gitignore b/.gitignore
index 9380dba..8cfbd3f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,9 +5,11 @@
 *.py[co]
 *.mo
 *~
-dmoj/local_settings.py
+# dmoj/local_settings.py
 resources/style.css
 resources/content-description.css
 resources/ranks.css
 resources/table.css
 sass_processed
+<desired bridge log path>
+
diff --git a/<desired bridge log path> b/<desired bridge log path>
new file mode 100644
index 0000000..83027ee
--- /dev/null
+++ b/<desired bridge log path>	
@@ -0,0 +1,556 @@
+INFO 2020-01-23 20:59:54,926 judgehandler Judge connected from: ('127.0.0.1', 49606)
+INFO 2020-01-23 20:59:54,927 judgehandler Judge authenticated: ('127.0.0.1', 49606) (judge1)
+INFO 2020-01-23 21:00:43,918 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:00:43,922 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:00:43,963 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:01:03,244 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:01:10,754 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:01:10,794 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:01:16,007 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:01:20,593 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:01:42,596 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:01:42,734 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:01:56,433 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:01:56,435 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:01:56,474 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:02:32,321 judgelist Free judges: 1
+INFO 2020-01-23 21:02:32,322 judgelist Dispatched submission 34 to: judge1
+INFO 2020-01-23 21:02:32,346 judgehandler Submission acknowledged: 34
+INFO 2020-01-23 21:02:32,443 judgehandler judge1: Grading has begun on: 34
+ERROR 2020-01-23 21:02:32,602 judgehandler Judge judge1 failed while handling submission 34
+Traceback (most recent call last):
+  File "/home/cuom1999/DMOJ/site/judge/bridge/judgehandler.py", line 230, in on_internal_error
+    raise ValueError('\n\n' + packet['message'])
+ValueError: 
+
+Traceback (most recent call last):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 164, in grading_cleanup_wrapper
+    self._block_and_grade(problem, language, source, short_circuit, meta, report=report)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 116, in _block_and_grade
+    short_circuit=short_circuit):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 208, in grade_cases
+    result = grader.grade(case)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/graders/standard.py", line 41, in grade
+    check = self.check_result(case, result)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/graders/standard.py", line 104, in check_result
+    execution_time=result.execution_time)
+TypeError: check() got an unexpected keyword argument 'submission_source'
+
+INFO 2020-01-23 21:02:32,908 judgelist Judge available after grading 34: judge1
+INFO 2020-01-23 21:03:00,574 judgelist Free judges: 1
+INFO 2020-01-23 21:03:00,574 judgelist Dispatched submission 34 to: judge1
+INFO 2020-01-23 21:03:00,585 judgehandler Submission acknowledged: 34
+INFO 2020-01-23 21:03:00,625 judgehandler judge1: Grading has begun on: 34
+ERROR 2020-01-23 21:03:00,713 judgehandler Judge judge1 failed while handling submission 34
+Traceback (most recent call last):
+  File "/home/cuom1999/DMOJ/site/judge/bridge/judgehandler.py", line 230, in on_internal_error
+    raise ValueError('\n\n' + packet['message'])
+ValueError: 
+
+Traceback (most recent call last):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 164, in grading_cleanup_wrapper
+    self._block_and_grade(problem, language, source, short_circuit, meta, report=report)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 116, in _block_and_grade
+    short_circuit=short_circuit):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 208, in grade_cases
+    result = grader.grade(case)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/graders/standard.py", line 41, in grade
+    check = self.check_result(case, result)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/graders/standard.py", line 104, in check_result
+    execution_time=result.execution_time)
+TypeError: check() got an unexpected keyword argument 'submission_source'
+
+INFO 2020-01-23 21:03:00,724 judgelist Judge available after grading 34: judge1
+INFO 2020-01-23 21:05:00,306 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:05:00,341 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:05:09,432 judgelist Free judges: 1
+INFO 2020-01-23 21:05:09,433 judgelist Dispatched submission 34 to: judge1
+INFO 2020-01-23 21:05:09,500 judgehandler Submission acknowledged: 34
+INFO 2020-01-23 21:05:09,535 judgehandler judge1: Grading has begun on: 34
+ERROR 2020-01-23 21:05:09,605 judgehandler Judge judge1 failed while handling submission 34
+Traceback (most recent call last):
+  File "/home/cuom1999/DMOJ/site/judge/bridge/judgehandler.py", line 230, in on_internal_error
+    raise ValueError('\n\n' + packet['message'])
+ValueError: 
+
+Traceback (most recent call last):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 164, in grading_cleanup_wrapper
+    self._block_and_grade(problem, language, source, short_circuit, meta, report=report)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 116, in _block_and_grade
+    short_circuit=short_circuit):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 208, in grade_cases
+    result = grader.grade(case)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/graders/standard.py", line 41, in grade
+    check = self.check_result(case, result)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/graders/standard.py", line 104, in check_result
+    execution_time=result.execution_time)
+TypeError: check() got an unexpected keyword argument 'submission_source'
+
+INFO 2020-01-23 21:05:09,614 judgelist Judge available after grading 34: judge1
+INFO 2020-01-23 21:05:26,728 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:05:26,764 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:05:30,048 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:05:30,086 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:05:44,198 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:05:44,200 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:05:44,234 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:05:46,193 judgelist Free judges: 1
+INFO 2020-01-23 21:05:46,194 judgelist Dispatched submission 34 to: judge1
+INFO 2020-01-23 21:05:46,210 judgehandler Submission acknowledged: 34
+INFO 2020-01-23 21:05:46,248 judgehandler judge1: Grading has begun on: 34
+INFO 2020-01-23 21:05:46,413 judgehandler judge1: 3 test case(s) completed on: 34
+INFO 2020-01-23 21:05:46,511 judgehandler judge1: Grading has ended on: 34
+INFO 2020-01-23 21:05:46,511 judgelist Judge available after grading 34: judge1
+INFO 2020-01-23 21:06:10,809 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:06:10,852 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:06:20,552 judgelist Free judges: 1
+INFO 2020-01-23 21:06:20,552 judgelist Dispatched submission 34 to: judge1
+INFO 2020-01-23 21:06:20,568 judgehandler Submission acknowledged: 34
+INFO 2020-01-23 21:06:20,599 judgehandler judge1: Grading has begun on: 34
+ERROR 2020-01-23 21:06:20,761 judgehandler Judge judge1 failed while handling submission 34
+Traceback (most recent call last):
+  File "/home/cuom1999/DMOJ/site/judge/bridge/judgehandler.py", line 230, in on_internal_error
+    raise ValueError('\n\n' + packet['message'])
+ValueError: 
+
+Traceback (most recent call last):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 164, in grading_cleanup_wrapper
+    self._block_and_grade(problem, language, source, short_circuit, meta, report=report)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 116, in _block_and_grade
+    short_circuit=short_circuit):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 208, in grade_cases
+    result = grader.grade(case)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/graders/standard.py", line 41, in grade
+    check = self.check_result(case, result)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/graders/standard.py", line 104, in check_result
+    execution_time=result.execution_time)
+TypeError: check() got an unexpected keyword argument 'submission_source'
+
+INFO 2020-01-23 21:06:20,797 judgelist Judge available after grading 34: judge1
+INFO 2020-01-23 21:06:40,778 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:06:41,412 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:07:05,264 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:07:05,306 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:07:08,465 judgelist Free judges: 1
+INFO 2020-01-23 21:07:08,465 judgelist Dispatched submission 34 to: judge1
+INFO 2020-01-23 21:07:08,482 judgehandler Submission acknowledged: 34
+INFO 2020-01-23 21:07:08,521 judgehandler judge1: Grading has begun on: 34
+ERROR 2020-01-23 21:07:08,597 judgehandler Judge judge1 failed while handling submission 34
+Traceback (most recent call last):
+  File "/home/cuom1999/DMOJ/site/judge/bridge/judgehandler.py", line 230, in on_internal_error
+    raise ValueError('\n\n' + packet['message'])
+ValueError: 
+
+Traceback (most recent call last):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 164, in grading_cleanup_wrapper
+    self._block_and_grade(problem, language, source, short_circuit, meta, report=report)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 116, in _block_and_grade
+    short_circuit=short_circuit):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 208, in grade_cases
+    result = grader.grade(case)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/graders/standard.py", line 41, in grade
+    check = self.check_result(case, result)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/graders/standard.py", line 104, in check_result
+    execution_time=result.execution_time)
+TypeError: check() got an unexpected keyword argument 'judge_input'
+
+INFO 2020-01-23 21:07:08,607 judgelist Judge available after grading 34: judge1
+INFO 2020-01-23 21:07:34,312 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:07:34,601 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:07:42,576 judgelist Free judges: 1
+INFO 2020-01-23 21:07:42,577 judgelist Dispatched submission 34 to: judge1
+INFO 2020-01-23 21:07:42,581 judgehandler Submission acknowledged: 34
+INFO 2020-01-23 21:07:42,619 judgehandler judge1: Grading has begun on: 34
+ERROR 2020-01-23 21:07:42,758 judgehandler Judge judge1 failed while handling submission 34
+Traceback (most recent call last):
+  File "/home/cuom1999/DMOJ/site/judge/bridge/judgehandler.py", line 230, in on_internal_error
+    raise ValueError('\n\n' + packet['message'])
+ValueError: 
+
+Traceback (most recent call last):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 164, in grading_cleanup_wrapper
+    self._block_and_grade(problem, language, source, short_circuit, meta, report=report)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 116, in _block_and_grade
+    short_circuit=short_circuit):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 208, in grade_cases
+    result = grader.grade(case)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/graders/standard.py", line 46, in grade
+    check = CheckerResult(check, case.points if check else 0.0)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/result.py", line 73, in __init__
+    assert isinstance(passed, bool)
+AssertionError
+
+INFO 2020-01-23 21:07:42,779 judgelist Judge available after grading 34: judge1
+INFO 2020-01-23 21:07:52,845 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:07:52,879 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:07:56,775 judgelist Free judges: 1
+INFO 2020-01-23 21:07:56,776 judgelist Dispatched submission 34 to: judge1
+INFO 2020-01-23 21:07:56,792 judgehandler Submission acknowledged: 34
+INFO 2020-01-23 21:07:56,830 judgehandler judge1: Grading has begun on: 34
+INFO 2020-01-23 21:07:56,900 judgehandler judge1: 1 test case(s) completed on: 34
+INFO 2020-01-23 21:07:57,003 judgehandler judge1: 2 test case(s) completed on: 34
+INFO 2020-01-23 21:07:57,071 judgehandler judge1: Grading has ended on: 34
+INFO 2020-01-23 21:07:57,071 judgelist Judge available after grading 34: judge1
+INFO 2020-01-23 21:08:16,944 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:08:16,982 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:08:19,552 judgelist Free judges: 1
+INFO 2020-01-23 21:08:19,552 judgelist Dispatched submission 34 to: judge1
+INFO 2020-01-23 21:08:19,622 judgehandler Submission acknowledged: 34
+INFO 2020-01-23 21:08:19,656 judgehandler judge1: Grading has begun on: 34
+INFO 2020-01-23 21:08:19,779 judgehandler judge1: 3 test case(s) completed on: 34
+INFO 2020-01-23 21:08:19,850 judgehandler judge1: Grading has ended on: 34
+INFO 2020-01-23 21:08:19,850 judgelist Judge available after grading 34: judge1
+INFO 2020-01-23 21:08:45,463 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:08:45,502 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:08:47,928 judgelist Free judges: 1
+INFO 2020-01-23 21:08:47,928 judgelist Dispatched submission 34 to: judge1
+INFO 2020-01-23 21:08:47,945 judgehandler Submission acknowledged: 34
+INFO 2020-01-23 21:08:47,986 judgehandler judge1: Grading has begun on: 34
+INFO 2020-01-23 21:08:48,171 judgehandler judge1: 2 test case(s) completed on: 34
+INFO 2020-01-23 21:08:48,256 judgehandler judge1: 1 test case(s) completed on: 34
+INFO 2020-01-23 21:08:48,326 judgehandler judge1: Grading has ended on: 34
+INFO 2020-01-23 21:08:48,326 judgelist Judge available after grading 34: judge1
+INFO 2020-01-23 21:09:44,861 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:09:44,902 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:09:45,340 judgelist Free judges: 1
+INFO 2020-01-23 21:09:45,340 judgelist Dispatched submission 34 to: judge1
+INFO 2020-01-23 21:09:45,379 judgehandler Submission acknowledged: 34
+INFO 2020-01-23 21:09:45,477 judgehandler judge1: Grading has begun on: 34
+ERROR 2020-01-23 21:09:45,549 judgehandler Judge judge1 failed while handling submission 34
+Traceback (most recent call last):
+  File "/home/cuom1999/DMOJ/site/judge/bridge/judgehandler.py", line 230, in on_internal_error
+    raise ValueError('\n\n' + packet['message'])
+ValueError: 
+
+Traceback (most recent call last):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 164, in grading_cleanup_wrapper
+    self._block_and_grade(problem, language, source, short_circuit, meta, report=report)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 116, in _block_and_grade
+    short_circuit=short_circuit):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 208, in grade_cases
+    result = grader.grade(case)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/graders/standard.py", line 41, in grade
+    check = self.check_result(case, result)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/graders/standard.py", line 104, in check_result
+    execution_time=result.execution_time)
+  File "/home/cuom1999/DMOJ/problems/aplusb/checker.py", line 3, in check
+    print(a[0])
+TypeError: 'map' object is not subscriptable
+
+INFO 2020-01-23 21:09:45,567 judgelist Judge available after grading 34: judge1
+INFO 2020-01-23 21:10:05,615 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:10:05,654 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:14:10,308 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:14:10,345 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:14:19,207 judgelist Free judges: 1
+INFO 2020-01-23 21:14:19,207 judgelist Dispatched submission 34 to: judge1
+INFO 2020-01-23 21:14:19,274 judgehandler Submission acknowledged: 34
+INFO 2020-01-23 21:14:19,310 judgehandler judge1: Grading has begun on: 34
+INFO 2020-01-23 21:14:19,394 judgehandler judge1: 1 test case(s) completed on: 34
+INFO 2020-01-23 21:14:19,482 judgehandler judge1: 2 test case(s) completed on: 34
+INFO 2020-01-23 21:14:19,551 judgehandler judge1: Grading has ended on: 34
+INFO 2020-01-23 21:14:19,551 judgelist Judge available after grading 34: judge1
+INFO 2020-01-23 21:15:36,115 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:15:36,120 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:15:36,152 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:15:43,219 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:15:43,222 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:15:43,418 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:17:00,163 judgelist Free judges: 1
+INFO 2020-01-23 21:17:00,163 judgelist Dispatched submission 34 to: judge1
+INFO 2020-01-23 21:17:00,179 judgehandler Submission acknowledged: 34
+INFO 2020-01-23 21:17:00,221 judgehandler judge1: Grading has begun on: 34
+ERROR 2020-01-23 21:17:00,497 judgehandler Judge judge1 failed while handling submission 34
+Traceback (most recent call last):
+  File "/home/cuom1999/DMOJ/site/judge/bridge/judgehandler.py", line 230, in on_internal_error
+    raise ValueError('\n\n' + packet['message'])
+ValueError: 
+
+Traceback (most recent call last):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 164, in grading_cleanup_wrapper
+    self._block_and_grade(problem, language, source, short_circuit, meta, report=report)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 116, in _block_and_grade
+    short_circuit=short_circuit):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 208, in grade_cases
+    result = grader.grade(case)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/graders/standard.py", line 41, in grade
+    check = self.check_result(case, result)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/graders/standard.py", line 90, in check_result
+    checker = case.checker()
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/problem.py", line 345, in checker
+    checker = self.problem.load_checker(name)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/problem.py", line 152, in load_checker
+    self._checkers[name] = checker = load_module_from_file(os.path.join(get_problem_root(self.id), name))
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/utils/module.py", line 18, in load_module_from_file
+    return load_module(name, f.read(), os.path.abspath(filename))
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/utils/module.py", line 9, in load_module
+    exec(compile(code, filename or '<string>', 'exec'), mod.__dict__)
+  File "/home/cuom1999/DMOJ/problems/aplusb/checker.py", line 6, in <module>
+    validator_path = os.path.join(get_problem_root('problem_id'), 'validator.cpp')
+  File "/usr/lib/python3.6/posixpath.py", line 80, in join
+    a = os.fspath(a)
+TypeError: expected str, bytes or os.PathLike object, not NoneType
+
+INFO 2020-01-23 21:17:00,535 judgelist Judge available after grading 34: judge1
+INFO 2020-01-23 21:17:21,510 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:17:21,579 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:17:24,798 judgelist Free judges: 1
+INFO 2020-01-23 21:17:24,798 judgelist Dispatched submission 34 to: judge1
+INFO 2020-01-23 21:17:24,867 judgehandler Submission acknowledged: 34
+INFO 2020-01-23 21:17:24,903 judgehandler judge1: Grading has begun on: 34
+ERROR 2020-01-23 21:17:24,972 judgehandler Judge judge1 failed while handling submission 34
+Traceback (most recent call last):
+  File "/home/cuom1999/DMOJ/site/judge/bridge/judgehandler.py", line 230, in on_internal_error
+    raise ValueError('\n\n' + packet['message'])
+ValueError: 
+
+Traceback (most recent call last):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/problem.py", line 345, in checker
+    checker = self.problem.load_checker(name)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/problem.py", line 152, in load_checker
+    self._checkers[name] = checker = load_module_from_file(os.path.join(get_problem_root(self.id), name))
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/utils/module.py", line 18, in load_module_from_file
+    return load_module(name, f.read(), os.path.abspath(filename))
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/utils/module.py", line 9, in load_module
+    exec(compile(code, filename or '<string>', 'exec'), mod.__dict__)
+  File "/home/cuom1999/DMOJ/problems/aplusb/checker.py", line 8, in <module>
+    with open(validator_path, 'r') as validator_source:
+FileNotFoundError: [Errno 2] No such file or directory: '/home/cuom1999/DMOJ/problems/aplusb/validator.cpp'
+
+During handling of the above exception, another exception occurred:
+
+Traceback (most recent call last):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 164, in grading_cleanup_wrapper
+    self._block_and_grade(problem, language, source, short_circuit, meta, report=report)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 116, in _block_and_grade
+    short_circuit=short_circuit):
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/judge.py", line 208, in grade_cases
+    result = grader.grade(case)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/graders/standard.py", line 41, in grade
+    check = self.check_result(case, result)
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/graders/standard.py", line 90, in check_result
+    checker = case.checker()
+  File "/usr/local/lib/python3.6/dist-packages/dmoj/problem.py", line 347, in checker
+    raise InvalidInitException('checker module path does not exist: %s' % name)
+dmoj.config.InvalidInitException: checker module path does not exist: checker.py
+
+INFO 2020-01-23 21:17:24,983 judgelist Judge available after grading 34: judge1
+INFO 2020-01-23 21:17:52,746 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:18:03,849 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:18:09,694 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:18:16,110 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:18:20,167 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:19:15,956 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:19:26,564 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:19:26,816 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:20:12,863 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:20:21,939 judgehandler judge1: Updated problem list
+INFO 2020-01-23 21:40:39,960 judgehandler judge1: Updated problem list
+INFO 2020-01-23 22:03:01,200 judgehandler judge1: Updated problem list
+INFO 2020-01-23 22:29:50,843 judgehandler judge1: Updated problem list
+INFO 2020-01-23 22:29:52,146 judgehandler judge1: Updated problem list
+INFO 2020-01-23 22:29:58,702 judgehandler judge1: Updated problem list
+INFO 2020-01-23 22:30:10,710 judgehandler judge1: Updated problem list
+INFO 2020-01-23 22:30:18,273 judgehandler judge1: Updated problem list
+INFO 2020-01-23 22:46:52,907 judgehandler judge1: Updated problem list
+INFO 2020-01-24 01:35:15,083 judgehandler Judge connected from: ('127.0.0.1', 34192)
+INFO 2020-01-24 01:35:15,233 judgehandler Judge authenticated: ('127.0.0.1', 34192) (judge1)
+INFO 2020-01-24 01:43:09,664 judgehandler judge1: Updated problem list
+INFO 2020-01-24 01:43:09,702 judgehandler judge1: Updated problem list
+INFO 2020-01-24 01:46:03,455 judgehandler judge1: Updated problem list
+INFO 2020-01-24 01:46:05,299 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:04:07,710 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:04:24,555 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:04:24,734 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:04:24,736 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:06:10,732 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:08:53,761 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:13:33,309 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:14:44,095 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:18:49,742 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:18:53,139 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:24:48,195 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:24:49,403 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:25:12,704 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:25:18,194 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:26:24,931 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:26:26,742 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:26:40,852 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:26:55,225 judgelist Free judges: 1
+INFO 2020-01-24 02:26:55,226 judgelist Dispatched submission 35 to: judge1
+INFO 2020-01-24 02:26:55,247 judgehandler Submission acknowledged: 35
+INFO 2020-01-24 02:26:55,292 judgehandler judge1: Grading has begun on: 35
+INFO 2020-01-24 02:26:55,454 judgehandler judge1: 3 test case(s) completed on: 35
+INFO 2020-01-24 02:26:55,581 judgehandler judge1: Grading has ended on: 35
+INFO 2020-01-24 02:26:55,581 judgelist Judge available after grading 35: judge1
+INFO 2020-01-24 02:28:19,521 judgehandler judge1: Updated problem list
+INFO 2020-01-24 02:28:30,526 judgelist Free judges: 1
+INFO 2020-01-24 02:28:30,526 judgelist Dispatched submission 36 to: judge1
+INFO 2020-01-24 02:28:30,545 judgehandler Submission acknowledged: 36
+INFO 2020-01-24 02:28:30,582 judgehandler judge1: Grading has begun on: 36
+INFO 2020-01-24 02:28:30,714 judgehandler judge1: 3 test case(s) completed on: 36
+INFO 2020-01-24 02:28:30,783 judgehandler judge1: Grading has ended on: 36
+INFO 2020-01-24 02:28:30,784 judgelist Judge available after grading 36: judge1
+INFO 2020-01-24 04:00:04,615 judgehandler judge1: Updated problem list
+INFO 2020-01-24 04:01:41,763 judgehandler judge1: Updated problem list
+INFO 2020-01-24 04:02:04,245 judgelist Free judges: 1
+INFO 2020-01-24 04:02:04,245 judgelist Dispatched submission 37 to: judge1
+INFO 2020-01-24 04:02:04,253 judgehandler Submission acknowledged: 37
+INFO 2020-01-24 04:02:04,288 judgehandler judge1: Grading has begun on: 37
+INFO 2020-01-24 04:02:04,357 judgehandler judge1: 1 test case(s) completed on: 37
+INFO 2020-01-24 04:02:04,460 judgehandler judge1: 2 test case(s) completed on: 37
+INFO 2020-01-24 04:02:04,528 judgehandler judge1: Grading has ended on: 37
+INFO 2020-01-24 04:02:04,529 judgelist Judge available after grading 37: judge1
+INFO 2020-01-24 04:02:20,761 judgelist Free judges: 1
+INFO 2020-01-24 04:02:20,762 judgelist Dispatched submission 38 to: judge1
+INFO 2020-01-24 04:02:20,778 judgehandler Submission acknowledged: 38
+INFO 2020-01-24 04:02:20,815 judgehandler judge1: Grading has begun on: 38
+INFO 2020-01-24 04:02:20,910 judgehandler judge1: 3 test case(s) completed on: 38
+INFO 2020-01-24 04:02:21,051 judgehandler judge1: Grading has ended on: 38
+INFO 2020-01-24 04:02:21,051 judgelist Judge available after grading 38: judge1
+INFO 2020-01-24 04:02:42,811 judgelist Free judges: 1
+INFO 2020-01-24 04:02:42,811 judgelist Dispatched submission 39 to: judge1
+INFO 2020-01-24 04:02:42,828 judgehandler Submission acknowledged: 39
+INFO 2020-01-24 04:02:42,863 judgehandler judge1: Grading has begun on: 39
+INFO 2020-01-24 04:02:42,953 judgehandler judge1: 3 test case(s) completed on: 39
+INFO 2020-01-24 04:02:43,035 judgehandler judge1: Grading has ended on: 39
+INFO 2020-01-24 04:02:43,035 judgelist Judge available after grading 39: judge1
+INFO 2020-01-24 04:03:07,798 judgelist Free judges: 1
+INFO 2020-01-24 04:03:07,798 judgelist Dispatched submission 40 to: judge1
+INFO 2020-01-24 04:03:07,815 judgehandler Submission acknowledged: 40
+INFO 2020-01-24 04:03:07,855 judgehandler judge1: Grading has begun on: 40
+INFO 2020-01-24 04:03:07,983 judgehandler judge1: 3 test case(s) completed on: 40
+INFO 2020-01-24 04:03:08,056 judgehandler judge1: Grading has ended on: 40
+INFO 2020-01-24 04:03:08,056 judgelist Judge available after grading 40: judge1
+INFO 2020-01-24 04:17:47,286 judgehandler judge1: Updated problem list
+INFO 2020-01-24 05:02:07,043 judgehandler judge1: Updated problem list
+INFO 2020-01-24 05:03:19,384 judgelist Free judges: 1
+INFO 2020-01-24 05:03:19,385 judgelist Dispatched submission 40 to: judge1
+INFO 2020-01-24 05:03:19,394 judgehandler Submission acknowledged: 40
+INFO 2020-01-24 05:03:19,441 judgehandler judge1: Grading has begun on: 40
+INFO 2020-01-24 05:03:19,596 judgehandler judge1: 5 test case(s) completed on: 40
+INFO 2020-01-24 05:03:19,847 judgehandler judge1: 7 test case(s) completed on: 40
+INFO 2020-01-24 05:03:20,098 judgehandler judge1: 8 test case(s) completed on: 40
+INFO 2020-01-24 05:03:20,921 judgehandler judge1: 4 test case(s) completed on: 40
+INFO 2020-01-24 05:03:21,120 judgehandler judge1: 1 test case(s) completed on: 40
+INFO 2020-01-24 05:03:21,380 judgehandler judge1: 5 test case(s) completed on: 40
+INFO 2020-01-24 05:03:21,521 judgehandler judge1: 3 test case(s) completed on: 40
+INFO 2020-01-24 05:03:21,656 judgehandler judge1: 7 test case(s) completed on: 40
+INFO 2020-01-24 05:03:21,852 judgehandler judge1: 7 test case(s) completed on: 40
+INFO 2020-01-24 05:03:22,103 judgehandler judge1: 8 test case(s) completed on: 40
+INFO 2020-01-24 05:03:22,354 judgehandler judge1: 7 test case(s) completed on: 40
+INFO 2020-01-24 05:03:22,813 judgehandler judge1: 4 test case(s) completed on: 40
+INFO 2020-01-24 05:03:23,394 judgehandler judge1: 1 test case(s) completed on: 40
+INFO 2020-01-24 05:03:23,741 judgehandler judge1: 3 test case(s) completed on: 40
+INFO 2020-01-24 05:03:24,608 judgehandler judge1: 1 test case(s) completed on: 40
+INFO 2020-01-24 05:03:24,757 judgehandler judge1: 6 test case(s) completed on: 40
+INFO 2020-01-24 05:03:24,907 judgehandler judge1: 2 test case(s) completed on: 40
+INFO 2020-01-24 05:03:25,211 judgehandler judge1: 1 test case(s) completed on: 40
+INFO 2020-01-24 05:03:25,355 judgehandler judge1: 4 test case(s) completed on: 40
+INFO 2020-01-24 05:03:25,498 judgehandler judge1: 7 test case(s) completed on: 40
+INFO 2020-01-24 05:03:25,643 judgehandler judge1: 7 test case(s) completed on: 40
+INFO 2020-01-24 05:03:26,556 judgehandler judge1: 2 test case(s) completed on: 40
+INFO 2020-01-24 05:03:26,717 judgehandler judge1: Grading has ended on: 40
+INFO 2020-01-24 05:03:26,717 judgelist Judge available after grading 40: judge1
+INFO 2020-01-24 05:03:44,777 judgelist Free judges: 1
+INFO 2020-01-24 05:03:44,778 judgelist Dispatched submission 38 to: judge1
+INFO 2020-01-24 05:03:44,794 judgehandler Submission acknowledged: 38
+INFO 2020-01-24 05:03:45,013 judgehandler judge1: Grading has begun on: 38
+INFO 2020-01-24 05:03:45,140 judgehandler judge1: 7 test case(s) completed on: 38
+INFO 2020-01-24 05:03:45,391 judgehandler judge1: 7 test case(s) completed on: 38
+INFO 2020-01-24 05:03:45,789 judgehandler judge1: 3 test case(s) completed on: 38
+INFO 2020-01-24 05:03:46,267 judgehandler judge1: 1 test case(s) completed on: 38
+INFO 2020-01-24 05:03:47,279 judgehandler judge1: 3 test case(s) completed on: 38
+INFO 2020-01-24 05:03:47,514 judgehandler judge1: 3 test case(s) completed on: 38
+INFO 2020-01-24 05:03:47,618 judgehandler judge1: 1 test case(s) completed on: 38
+INFO 2020-01-24 05:03:47,712 judgehandler judge1: 1 test case(s) completed on: 38
+INFO 2020-01-24 05:03:47,805 judgehandler judge1: 1 test case(s) completed on: 38
+INFO 2020-01-24 05:03:47,899 judgehandler judge1: 4 test case(s) completed on: 38
+INFO 2020-01-24 05:03:47,994 judgehandler judge1: 7 test case(s) completed on: 38
+INFO 2020-01-24 05:03:48,134 judgehandler judge1: 7 test case(s) completed on: 38
+INFO 2020-01-24 05:03:48,275 judgehandler judge1: 7 test case(s) completed on: 38
+INFO 2020-01-24 05:03:48,399 judgehandler judge1: 8 test case(s) completed on: 38
+INFO 2020-01-24 05:03:48,650 judgehandler judge1: 7 test case(s) completed on: 38
+INFO 2020-01-24 05:03:48,901 judgehandler judge1: 7 test case(s) completed on: 38
+INFO 2020-01-24 05:03:49,762 judgehandler judge1: 2 test case(s) completed on: 38
+INFO 2020-01-24 05:03:49,957 judgehandler judge1: 1 test case(s) completed on: 38
+INFO 2020-01-24 05:03:50,194 judgehandler judge1: 7 test case(s) completed on: 38
+INFO 2020-01-24 05:03:50,314 judgehandler judge1: 7 test case(s) completed on: 38
+INFO 2020-01-24 05:03:50,703 judgehandler judge1: 7 test case(s) completed on: 38
+INFO 2020-01-24 05:03:50,846 judgehandler judge1: 2 test case(s) completed on: 38
+INFO 2020-01-24 05:03:51,804 judgehandler judge1: Grading has ended on: 38
+INFO 2020-01-24 05:03:51,804 judgelist Judge available after grading 38: judge1
+INFO 2020-01-24 05:04:06,445 judgelist Free judges: 1
+INFO 2020-01-24 05:04:06,446 judgelist Dispatched submission 39 to: judge1
+INFO 2020-01-24 05:04:06,459 judgehandler Submission acknowledged: 39
+INFO 2020-01-24 05:04:06,506 judgehandler judge1: Grading has begun on: 39
+INFO 2020-01-24 05:04:06,677 judgehandler judge1: 4 test case(s) completed on: 39
+INFO 2020-01-24 05:04:06,928 judgehandler judge1: 7 test case(s) completed on: 39
+INFO 2020-01-24 05:04:07,178 judgehandler judge1: 7 test case(s) completed on: 39
+INFO 2020-01-24 05:04:07,429 judgehandler judge1: 7 test case(s) completed on: 39
+INFO 2020-01-24 05:04:07,679 judgehandler judge1: 8 test case(s) completed on: 39
+INFO 2020-01-24 05:04:08,955 judgehandler judge1: 2 test case(s) completed on: 39
+INFO 2020-01-24 05:04:09,048 judgehandler judge1: 1 test case(s) completed on: 39
+INFO 2020-01-24 05:04:09,142 judgehandler judge1: 1 test case(s) completed on: 39
+INFO 2020-01-24 05:04:09,235 judgehandler judge1: 4 test case(s) completed on: 39
+INFO 2020-01-24 05:04:09,325 judgehandler judge1: 6 test case(s) completed on: 39
+INFO 2020-01-24 05:04:09,436 judgehandler judge1: 8 test case(s) completed on: 39
+INFO 2020-01-24 05:04:09,687 judgehandler judge1: 7 test case(s) completed on: 39
+INFO 2020-01-24 05:04:09,937 judgehandler judge1: 7 test case(s) completed on: 39
+INFO 2020-01-24 05:04:10,188 judgehandler judge1: 7 test case(s) completed on: 39
+INFO 2020-01-24 05:04:10,439 judgehandler judge1: 8 test case(s) completed on: 39
+INFO 2020-01-24 05:04:11,345 judgehandler judge1: 5 test case(s) completed on: 39
+INFO 2020-01-24 05:04:11,658 judgehandler judge1: 1 test case(s) completed on: 39
+INFO 2020-01-24 05:04:11,836 judgehandler judge1: 7 test case(s) completed on: 39
+INFO 2020-01-24 05:04:12,014 judgehandler judge1: 3 test case(s) completed on: 39
+INFO 2020-01-24 05:04:12,128 judgehandler judge1: Grading has ended on: 39
+INFO 2020-01-24 05:04:12,128 judgelist Judge available after grading 39: judge1
+INFO 2020-01-24 05:24:11,841 judgehandler judge1: Updated problem list
+INFO 2020-01-24 05:24:14,084 judgehandler judge1: Updated problem list
+INFO 2020-01-24 05:35:10,473 judgehandler judge1: Updated problem list
+INFO 2020-01-24 05:35:30,120 judgehandler judge1: Updated problem list
+INFO 2020-01-24 05:36:00,928 judgelist Free judges: 1
+INFO 2020-01-24 05:36:00,928 judgelist Dispatched submission 41 to: judge1
+INFO 2020-01-24 05:36:00,944 judgehandler Submission acknowledged: 41
+INFO 2020-01-24 05:36:00,984 judgehandler judge1: Grading has begun on: 41
+INFO 2020-01-24 05:36:01,275 judgehandler judge1: 8 test case(s) completed on: 41
+INFO 2020-01-24 05:36:01,526 judgehandler judge1: 6 test case(s) completed on: 41
+INFO 2020-01-24 05:36:01,777 judgehandler judge1: 8 test case(s) completed on: 41
+INFO 2020-01-24 05:36:02,027 judgehandler judge1: 7 test case(s) completed on: 41
+INFO 2020-01-24 05:36:02,113 judgehandler judge1: 1 test case(s) completed on: 41
+INFO 2020-01-24 05:36:02,206 judgehandler judge1: Grading has ended on: 41
+INFO 2020-01-24 05:36:02,206 judgelist Judge available after grading 41: judge1
+INFO 2020-01-26 05:15:24,961 judgehandler Judge connected from: ('127.0.0.1', 34940)
+INFO 2020-01-26 05:15:24,983 judgehandler Judge authenticated: ('127.0.0.1', 34940) (judge1)
+INFO 2020-01-26 05:15:28,838 judgelist Free judges: 1
+INFO 2020-01-26 05:15:28,840 judgelist Dispatched submission 42 to: judge1
+INFO 2020-01-26 05:15:28,861 judgehandler Submission acknowledged: 42
+INFO 2020-01-26 05:15:28,948 judgehandler judge1: Grading has begun on: 42
+INFO 2020-01-26 05:15:29,162 judgehandler judge1: 6 test case(s) completed on: 42
+INFO 2020-01-26 05:15:29,413 judgehandler judge1: 7 test case(s) completed on: 42
+INFO 2020-01-26 05:15:29,663 judgehandler judge1: 7 test case(s) completed on: 42
+INFO 2020-01-26 05:15:29,915 judgehandler judge1: 8 test case(s) completed on: 42
+INFO 2020-01-26 05:15:30,166 judgehandler judge1: 7 test case(s) completed on: 42
+INFO 2020-01-26 05:15:30,416 judgehandler judge1: 7 test case(s) completed on: 42
+INFO 2020-01-26 05:15:30,667 judgehandler judge1: 7 test case(s) completed on: 42
+INFO 2020-01-26 05:15:30,918 judgehandler judge1: 8 test case(s) completed on: 42
+INFO 2020-01-26 05:15:31,170 judgehandler judge1: 5 test case(s) completed on: 42
+INFO 2020-01-26 05:15:32,176 judgehandler judge1: 1 test case(s) completed on: 42
+INFO 2020-01-26 05:15:32,608 judgehandler judge1: 2 test case(s) completed on: 42
+INFO 2020-01-26 05:15:32,731 judgehandler judge1: 2 test case(s) completed on: 42
+INFO 2020-01-26 05:15:32,800 judgehandler judge1: 2 test case(s) completed on: 42
+INFO 2020-01-26 05:15:32,869 judgehandler judge1: 2 test case(s) completed on: 42
+INFO 2020-01-26 05:15:33,824 judgehandler judge1: 1 test case(s) completed on: 42
+INFO 2020-01-26 05:15:34,409 judgehandler judge1: 7 test case(s) completed on: 42
+INFO 2020-01-26 05:15:34,807 judgehandler judge1: 3 test case(s) completed on: 42
+INFO 2020-01-26 05:15:34,911 judgehandler judge1: 2 test case(s) completed on: 42
+INFO 2020-01-26 05:15:34,986 judgehandler judge1: 1 test case(s) completed on: 42
+INFO 2020-01-26 05:15:35,061 judgehandler judge1: 2 test case(s) completed on: 42
+INFO 2020-01-26 05:15:35,156 judgehandler judge1: 2 test case(s) completed on: 42
+INFO 2020-01-26 05:15:35,249 judgehandler judge1: 1 test case(s) completed on: 42
+INFO 2020-01-26 05:15:35,343 judgehandler judge1: 2 test case(s) completed on: 42
+INFO 2020-01-26 05:15:35,436 judgehandler judge1: 5 test case(s) completed on: 42
+INFO 2020-01-26 05:15:35,531 judgehandler judge1: 3 test case(s) completed on: 42
+INFO 2020-01-26 05:15:35,729 judgehandler judge1: Grading has ended on: 42
+INFO 2020-01-26 05:15:35,729 judgelist Judge available after grading 42: judge1
+INFO 2020-01-26 05:28:39,295 judgehandler Judge disconnected from: ('127.0.0.1', 34940)
diff --git a/README.html b/README.html
new file mode 100644
index 0000000..53d70c6
--- /dev/null
+++ b/README.html
@@ -0,0 +1,1078 @@
+<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><style>body {
+  max-width: 980px;
+  border: 1px solid #ddd;
+  outline: 1300px solid #fff;
+  margin: 16px auto;
+}
+
+body .markdown-body
+{
+  padding: 45px;
+}
+
+@font-face {
+  font-family: fontawesome-mini;
+  src: 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+}
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+}
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+}
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+}
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+  color: #000;
+  font-style: italic;
+  font-weight: bold;
+}
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+}
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+}
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+}
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+}
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+}
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+}
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+}
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+  font: inherit;
+  margin: 0;
+}
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+}
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+}
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+  padding: 0;
+}
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+}
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+}
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+}
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+}
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+}
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+}
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+}
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+}
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+}
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+}
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+}
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+}
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+}
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+}
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+}
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+  margin-bottom: 0;
+}
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+}
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+}
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+}
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+  vertical-align: middle;
+  margin-left: -16px;
+  float: left;
+  display: inline-block;
+  text-decoration: none;
+  opacity: 0;
+  color: #333;
+}
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+}
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+}
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+}
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+}
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+}
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+.markdown-body h4:hover .headerlink,
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+  text-decoration: none;
+}
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+  font-size: 2.25em;
+  line-height: 1.2;
+  border-bottom: 1px solid #eee;
+}
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+}
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+}
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+}
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+  margin-bottom: 16px;
+}
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+  padding: 0;
+  margin: 16px 0;
+  background-color: #e7e7e7;
+  border: 0 none;
+}
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+}
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+  margin-bottom: 0;
+}
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+}
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+}
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+  margin-top: 16px;
+  font-size: 1em;
+  font-style: italic;
+  font-weight: bold;
+}
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+  margin-bottom: 16px;
+}
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+  color: #777;
+  border-left: 4px solid #ddd;
+}
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+}
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+}
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+  word-break: normal;
+  word-break: keep-all;
+}
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+}
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+  border: 1px solid #ddd;
+}
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+.codehilite .gc{color:#999;background-color:#EAF2F5}
+</style><title>README</title></head><body><article class="markdown-body"><h1 id="online-judge">online-judge<a class="headerlink" href="#online-judge" title="Permanent link"></a></h1>
+<h3 id="1-activate-virtualenv">1. Activate virtualenv:<a class="headerlink" href="#1-activate-virtualenv" title="Permanent link"></a></h3>
+<p>source dmojsite/bin/activate</p>
+<h3 id="2-remember-to-change-the-local_settings">2. Remember to change the local_settings<a class="headerlink" href="#2-remember-to-change-the-local_settings" title="Permanent link"></a></h3>
+<h3 id="3-run-server">3. Run server:<a class="headerlink" href="#3-run-server" title="Permanent link"></a></h3>
+<p>python manage.py runserver 0.0.0.0:8000</p>
+<h3 id="4-create-configure-file-for-judge">4. Create configure file for judge:<a class="headerlink" href="#4-create-configure-file-for-judge" title="Permanent link"></a></h3>
+<p>python dmojauto-conf</p>
+<h3 id="5-create-folder-for-problems-change-the-dir-in-judge-conf-file-and-local_settingspy">5. Create folder for problems, change the dir in judge conf file and local_settings.py<a class="headerlink" href="#5-create-folder-for-problems-change-the-dir-in-judge-conf-file-and-local_settingspy" title="Permanent link"></a></h3>
+<h3 id="6-connect-judge">6. Connect judge:<a class="headerlink" href="#6-connect-judge" title="Permanent link"></a></h3>
+<ul>
+<li>python manage.py runbridged</li>
+<li>dmoj 0.0.0.0 -p 9999 -c judge/conf1.yml (depend on port in the local_settings.py)</li>
+</ul>
+<h3 id="7-change-vietnamese">7. Change vietnamese:<a class="headerlink" href="#7-change-vietnamese" title="Permanent link"></a></h3>
+<ul>
+<li>go to /home/cuom1999/DMOJ/site/locale/vi</li>
+<li>open .po file</li>
+<li>python manage.py compilemessages</li>
+<li>python manage.py compilejsi18n</li>
+</ul></article></body></html>
\ No newline at end of file
diff --git a/README.md b/README.md
index a96bb39..9d90172 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,22 @@
 # online-judge
-LQD Online Judge
+### 1. Activate virtualenv:
+source dmojsite/bin/activate
+### 2. Remember to change the local_settings
+
+### 3. Run server:
+python manage.py runserver 0.0.0.0:8000
+
+### 4. Create configure file for judge:
+python dmojauto-conf
+
+### 5. Create folder for problems, change the dir in judge conf file and local_settings.py
+
+### 6. Connect judge:
++ python manage.py runbridged
++ dmoj 0.0.0.0 -p 9999 -c judge/conf1.yml (depend on port in the local_settings.py and directory of conf file)
+
+### 7. Change vietnamese:
+ - go to /home/cuom1999/DMOJ/site/locale/vi
+ - open .po file
+ - python manage.py compilemessages
+ - python manage.py compilejsi18n
diff --git a/chat_box/__init__.py b/chat_box/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/chat_box/apps.py b/chat_box/apps.py
new file mode 100644
index 0000000..fbc3ca1
--- /dev/null
+++ b/chat_box/apps.py
@@ -0,0 +1,5 @@
+from django.apps import AppConfig
+
+
+class ChatBoxConfig(AppConfig):
+    name = 'chat_box'
diff --git a/chat_box/consumers.py b/chat_box/consumers.py
new file mode 100644
index 0000000..d200968
--- /dev/null
+++ b/chat_box/consumers.py
@@ -0,0 +1,47 @@
+import json
+
+from channels.generic.websocket import AsyncWebsocketConsumer
+
+
+class ChatConsumer(AsyncWebsocketConsumer):
+    async def connect(self):
+        self.room_name = 'common'
+        self.room_group_name = 'chat_%s' % self.room_name
+
+        # Join room group
+        await self.channel_layer.group_add(
+            self.room_group_name,
+            self.channel_name,
+        )
+
+        await self.accept()
+
+    async def disconnect(self, close_code):
+        # Leave room group
+        await self.channel_layer.group_discard(
+            self.room_group_name,
+            self.channel_name,
+        )
+
+    # Receive message from WebSocket
+    async def receive(self, text_data):
+        text_data_json = json.loads(text_data)
+        message = text_data_json['message']
+
+        # Send message to room group
+        await self.channel_layer.group_send(
+            self.room_group_name,
+            {
+                'type': 'chat_message',
+                'message': message,
+            },
+        )
+
+    # Receive message from room group
+    async def chat_message(self, event):
+        message = event['message']
+
+        # Send message to WebSocket
+        await self.send(text_data=json.dumps({
+            'message': message,
+        }))
diff --git a/chat_box/migrations/0001_initial.py b/chat_box/migrations/0001_initial.py
new file mode 100644
index 0000000..b311ab5
--- /dev/null
+++ b/chat_box/migrations/0001_initial.py
@@ -0,0 +1,30 @@
+# Generated by Django 2.2.9 on 2020-01-28 05:07
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('judge', '0100_auto_20200127_0059'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Message',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('time', models.DateTimeField(auto_now_add=True, verbose_name='posted time')),
+                ('body', models.TextField(max_length=8192, verbose_name='body of comment')),
+                ('author', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='judge.Profile', verbose_name='user')),
+            ],
+            options={
+                'verbose_name': 'message',
+                'verbose_name_plural': 'messages',
+                'ordering': ('-time',),
+            },
+        ),
+    ]
diff --git a/chat_box/migrations/__init__.py b/chat_box/migrations/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/chat_box/models.py b/chat_box/models.py
new file mode 100644
index 0000000..297b921
--- /dev/null
+++ b/chat_box/models.py
@@ -0,0 +1,45 @@
+# based on https://github.com/narrowfail/django-channels-chat
+
+from asgiref.sync import async_to_sync
+from channels.layers import get_channel_layer
+from django.db import models
+from django.db.models import CASCADE
+from django.utils.translation import gettext_lazy as _
+
+
+from judge.models.profile import Profile
+
+
+__all__ = ['Message']
+
+
+class Message(models.Model):
+    author = models.ForeignKey(Profile, verbose_name=_('user'), on_delete=CASCADE)
+    time = models.DateTimeField(verbose_name=_('posted time'), auto_now_add=True)
+    body = models.TextField(verbose_name=_('body of comment'), max_length=8192)
+
+    def notify_ws_clients(self):
+        # inform client that there is a new message
+        notification = {
+            'type': 'recieve_group_message',
+            'message': '{}'.format(self.id)
+        }
+        channel_layer = get_channel_layer()
+        # print("user.id {}".format(self.user.id))
+        # print("user.id {}".format(self.recipient.id))
+
+        async_to_sync(channel_layer.group_send)("{}".format(self.user.id), notification)
+        async_to_sync(channel_layer.group_send)("{}".format(self.recipient.id), notification)
+
+    def save(self, *args, **kwargs):
+        new_message = self.id
+        self.body = self.body.strip()
+        super(Message, self).save(*args, **kwargs)
+        if new_message is None:
+            self.notify_ws_clients()
+
+    class Meta:
+        app_label = 'chat_box'
+        verbose_name = 'message'
+        verbose_name_plural = 'messages'
+        ordering = ('-time',)
diff --git a/chat_box/routing.py b/chat_box/routing.py
new file mode 100644
index 0000000..f420f4f
--- /dev/null
+++ b/chat_box/routing.py
@@ -0,0 +1,7 @@
+from django.urls import re_path
+
+from . import consumers
+
+websocket_urlpatterns = [
+    re_path(r'ws/chat/', consumers.ChatConsumer),
+]
diff --git a/chat_box/tests.py b/chat_box/tests.py
new file mode 100644
index 0000000..7ce503c
--- /dev/null
+++ b/chat_box/tests.py
@@ -0,0 +1,3 @@
+from django.test import TestCase
+
+# Create your tests here.
diff --git a/chat_box/views.py b/chat_box/views.py
new file mode 100644
index 0000000..a032014
--- /dev/null
+++ b/chat_box/views.py
@@ -0,0 +1,7 @@
+from django.shortcuts import render
+from django.utils.translation import gettext as _
+from django.views import View
+
+
+class ChatView(View):
+    template_name = 'chat.html'
\ No newline at end of file
diff --git a/dmoj/local_settings.py b/dmoj/local_settings.py
new file mode 100755
index 0000000..607c415
--- /dev/null
+++ b/dmoj/local_settings.py
@@ -0,0 +1,314 @@
+#####################################
+########## Django settings ##########
+#####################################
+# See <https://docs.djangoproject.com/en/1.11/ref/settings/>
+# for more info and help. If you are stuck, you can try Googling about
+# Django - many of these settings below have external documentation about them.
+#
+# The settings listed here are of special interest in configuring the site.
+
+# SECURITY WARNING: keep the secret key used in production secret!
+# You may use <http://www.miniwebtool.com/django-secret-key-generator/>
+# to generate this key.
+SECRET_KEY = 's(8*xdlaiy4r@09cidu#)h%%iey39099g=hp(#+kzz+7vefs4u'
+
+# SECURITY WARNING: don't run with debug turned on in production!
+DEBUG = True  # Change to False once you are done with runserver testing.
+
+# Uncomment and set to the domain names this site is intended to serve.
+# You must do this once you set DEBUG to False.
+ALLOWED_HOSTS = ['0.0.0.0']
+
+# Optional apps that DMOJ can make use of.
+INSTALLED_APPS += (
+)
+
+#path to problem folder
+DMOJ_PROBLEM_DATA_ROOT = '/home/cuom1999/DMOJ/problems'
+
+# Caching. You can use memcached or redis instead.
+# Documentation: <https://docs.djangoproject.com/en/1.11/topics/cache/>
+CACHES = {
+    'default': {
+        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache'
+    }
+}
+
+# Your database credentials. Only MySQL is supported by DMOJ.
+# Documentation: <https://docs.djangoproject.com/en/1.11/ref/databases/>
+DATABASES = {
+     'default': {
+        'ENGINE': 'django.db.backends.mysql',
+        'NAME': 'dmoj',
+        'USER': 'dmoj',
+        'PASSWORD': '<password>',
+        'HOST': '127.0.0.1',
+        'OPTIONS': {
+            'charset': 'utf8mb4',
+            'sql_mode': 'STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION',
+        },
+    }
+}
+
+# Sessions.
+# Documentation: <https://docs.djangoproject.com/en/1.11/topics/http/sessions/>
+#SESSION_ENGINE = 'django.contrib.sessions.backends.cached_db'
+
+# Internationalization.
+# Documentation: <https://docs.djangoproject.com/en/1.11/topics/i18n/>
+LANGUAGE_CODE = 'en-ca'
+DEFAULT_USER_TIME_ZONE = 'America/Mexico_City'
+USE_I18N = True
+USE_L10N = True
+USE_TZ = True
+
+## django-compressor settings, for speeding up page load times by minifying CSS and JavaScript files.
+# Documentation: https://django-compressor.readthedocs.io/en/latest/
+COMPRESS_OUTPUT_DIR = 'cache'
+COMPRESS_CSS_FILTERS = [
+    'compressor.filters.css_default.CssAbsoluteFilter',
+    'compressor.filters.cssmin.CSSMinFilter',
+]
+COMPRESS_JS_FILTERS = ['compressor.filters.jsmin.JSMinFilter']
+COMPRESS_STORAGE = 'compressor.storage.GzipCompressorFileStorage'
+STATICFILES_FINDERS += ('compressor.finders.CompressorFinder',)
+
+
+#########################################
+########## Email configuration ##########
+#########################################
+# See <https://docs.djangoproject.com/en/1.11/topics/email/#email-backends>
+# for more documentation. You should follow the information there to define 
+# your email settings.
+
+# Use this if you are just testing.
+EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
+
+# The following block is included for your convenience, if you want 
+# to use Gmail.
+#EMAIL_USE_TLS = True
+#EMAIL_HOST = 'smtp.gmail.com'
+#EMAIL_HOST_USER = '<your account>@gmail.com'
+#EMAIL_HOST_PASSWORD = '<your password>'
+#EMAIL_PORT = 587
+
+# To use Mailgun, uncomment this block.
+# You will need to run `pip install django-mailgun` for to get `MailgunBackend`.
+#EMAIL_BACKEND = 'django_mailgun.MailgunBackend'
+#MAILGUN_ACCESS_KEY = '<your Mailgun access key>'
+#MAILGUN_SERVER_NAME = '<your Mailgun domain>'
+
+# You can also use Sendgrid, with `pip install sendgrid-django`.
+#EMAIL_BACKEND = 'sgbackend.SendGridBackend'
+#SENDGRID_API_KEY = '<Your SendGrid API Key>'
+
+# The DMOJ site is able to notify administrators of errors via email,
+# if configured as shown below.
+
+# A tuple of (name, email) pairs that specifies those who will be mailed
+# when the server experiences an error when DEBUG = False.
+ADMINS = (
+    ('cuom1999', 'your.email@example.com'),
+)
+
+# The sender for the aforementioned emails.
+SERVER_EMAIL = 'DMOJ: Modern Online Judge <errors@dmoj.ca>'
+
+
+##################################################
+########### Static files configuration. ##########
+##################################################
+# See <https://docs.djangoproject.com/en/1.11/howto/static-files/>.
+
+# Change this to somewhere more permanent., especially if you are using a 
+# webserver to serve the static files. This is the directory where all the 
+# static files DMOJ uses will be collected to.
+# You must configure your webserver to serve this directory as /static/ in production.
+STATIC_ROOT = '/home/cuom1999/DMOJ/static_root'
+
+# URL to access static files.
+#STATIC_URL = '/static/'
+
+# Uncomment to use hashed filenames with the cache framework.
+#STATICFILES_STORAGE = 'django.contrib.staticfiles.storage.CachedStaticFilesStorage'
+
+############################################
+########## DMOJ-specific settings ##########
+############################################
+
+## DMOJ site display settings.
+SITE_NAME = 'FOOJ'
+SITE_LONG_NAME = 'FOOJ: Modern Online Judge'
+SITE_ADMIN_EMAIL = 'admin@example.com'
+TERMS_OF_SERVICE_URL = '//dmoj.ca/tos' # Use a flatpage.
+
+## Bridge controls.
+# The judge connection address and port; where the judges will connect to the site.
+# You should change this to something your judges can actually connect to 
+# (e.g., a port that is unused and unblocked by a firewall).
+BRIDGED_JUDGE_ADDRESS = [('0.0.0.0', 9999)]
+
+# The bridged daemon bind address and port to communicate with the site.
+BRIDGED_DJANGO_ADDRESS = [('localhost', 9998)]
+
+## DMOJ features.
+# Set to True to enable full-text searching for problems.
+ENABLE_FTS = True
+
+# Set of email providers to ban when a user registers, e.g., {'throwawaymail.com'}.
+BAD_MAIL_PROVIDERS = set()
+
+# The number of submissions that a staff user can rejudge at once without
+# requiring the permission 'Rejudge a lot of submissions'.
+# Uncomment to change the submission limit.
+REJUDGE_SUBMISSION_LIMIT = 10
+
+## Event server.
+# Uncomment to enable live updating.
+# EVENT_DAEMON_USE = True
+
+# Uncomment this section to use websocket/daemon.js included in the site.
+#EVENT_DAEMON_POST = '<ws:// URL to post to>'
+
+# If you are using the defaults from the guide, it is this:
+EVENT_DAEMON_POST = 'ws://127.0.0.1:15101/'
+
+# These are the publicly accessed interface configurations.
+# They should match those used by the script.
+#EVENT_DAEMON_GET = '<public ws:// URL for clients>'
+#EVENT_DAEMON_GET_SSL = '<public wss:// URL for clients>'
+#EVENT_DAEMON_POLL = '<public URL to access the HTTP long polling of event server>'
+# i.e. the path to /channels/ exposed by the daemon, through whatever proxy setup you have.
+
+# Using our standard nginx configuration, these should be.
+#EVENT_DAEMON_GET = 'ws://<your domain>/event/'
+#EVENT_DAEMON_GET_SSL = 'wss://<your domain>/event/' # Optional
+#EVENT_DAEMON_POLL = '/channels/'
+
+# If you would like to use the AMQP-based event server from <https://github.com/DMOJ/event-server>,
+# uncomment this section instead. This is more involved, and recommended to be done
+# only after you have a working event server.
+#EVENT_DAEMON_AMQP = '<amqp:// URL to connect to, including username and password>'
+#EVENT_DAEMON_AMQP_EXCHANGE = '<AMQP exchange to use>'
+
+## CDN control.
+# Base URL for a copy of ace editor.
+# Should contain ace.js, along with mode-*.js.
+ACE_URL = '//cdnjs.cloudflare.com/ajax/libs/ace/1.2.3/'
+JQUERY_JS = '//cdnjs.cloudflare.com/ajax/libs/jquery/2.2.4/jquery.min.js'
+SELECT2_JS_URL = '//cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js'
+SELECT2_CSS_URL = '//cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.min.css'
+
+# A map of Earth in Equirectangular projection, for timezone selection.
+# Please try not to hotlink this poor site.
+TIMEZONE_MAP = 'http://naturalearth.springercarto.com/ne3_data/8192/textures/3_no_ice_clouds_8k.jpg'
+
+## Camo (https://github.com/atmos/camo) usage.
+#CAMO_URL = "<URL to your camo install>"
+#CAMO_KEY = "<The CAMO_KEY environmental variable you used>"
+
+# Domains to exclude from being camo'd.
+#CAMO_EXCLUDE = ("https://dmoj.ml", "https://dmoj.ca")
+
+# Set to True to use https when dealing with protocol-relative URLs.
+# See <http://www.paulirish.com/2010/the-protocol-relative-url/> for what they are.
+#CAMO_HTTPS = False
+
+# HTTPS level. Affects <link rel='canonical'> elements generated.
+# Set to 0 to make http URLs canonical.
+# Set to 1 to make the currently used protocol canonical.
+# Set to 2 to make https URLs canonical.
+#DMOJ_HTTPS = 0
+
+## PDF rendering settings.
+# Directory to cache the PDF.
+# PROBLEM_PDF_CACHE = '/home/dmoj-uwsgi/pdfcache'
+
+# Path to use for nginx's X-Accel-Redirect feature.
+# Should be an internal location mapped to the above directory.
+# PROBLEM_PDF_INTERNAL = '/pdfcache'
+
+# Path to a PhantomJS executable.
+#PHANTOMJS = '/usr/local/bin/phantomjs'
+
+# If you can't use PhantomJS or prefer wkhtmltopdf, set the path to wkhtmltopdf executable instead.
+#WKHTMLTOPDF = '/usr/local/bin/wkhtmltopdf'
+
+# Note that PhantomJS is preferred over wkhtmltopdf and would be used when both are defined.
+
+## ======== Logging Settings ========
+# Documentation: https://docs.djangoproject.com/en/1.9/ref/settings/#logging
+#                https://docs.python.org/2/library/logging.config.html#logging-config-dictschema
+LOGGING = {
+    'version': 1,
+    'disable_existing_loggers': False,
+    'formatters': {
+        'file': {
+            'format': '%(levelname)s %(asctime)s %(module)s %(message)s',
+        },
+        'simple': {
+            'format': '%(levelname)s %(message)s',
+        },
+    },
+    'handlers': {
+        # You may use this handler as example for logging to other files..
+        'bridge': {
+            'level': 'INFO',
+            'class': 'logging.handlers.RotatingFileHandler',
+            'filename': '<desired bridge log path>',
+            'maxBytes': 10 * 1024 * 1024,
+            'backupCount': 10,
+            'formatter': 'file',
+        },
+        'mail_admins': {
+            'level': 'ERROR',
+            'class': 'dmoj.throttle_mail.ThrottledEmailHandler',
+        },
+        'console': {
+            'level': 'DEBUG',
+            'class': 'logging.StreamHandler',
+            'formatter': 'file',
+        },
+    },
+    'loggers': {
+        # Site 500 error mails.
+        'django.request': {
+            'handlers': ['mail_admins'],
+            'level': 'ERROR',
+            'propagate': False,
+        },
+        # Judging logs as received by bridged.
+        'judge.bridge': {
+            'handlers': ['bridge', 'mail_admins'],
+            'level': 'INFO',
+            'propagate': True,
+        },
+        # Catch all log to stderr.
+        '': {
+            'handlers': ['console'],
+        },
+        # Other loggers of interest. Configure at will.
+        #  - judge.user: logs naughty user behaviours.
+        #  - judge.problem.pdf: PDF generation log.
+        #  - judge.html: HTML parsing errors when processing problem statements etc.
+        #  - judge.mail.activate: logs for the reply to activate feature.
+        #  - event_socket_server
+    },
+}
+
+## ======== Integration Settings ========
+## Python Social Auth
+# Documentation: https://python-social-auth.readthedocs.io/en/latest/
+# You can define these to enable authentication through the following services.
+#SOCIAL_AUTH_GOOGLE_OAUTH2_KEY = ''
+#SOCIAL_AUTH_GOOGLE_OAUTH2_SECRET = ''
+#SOCIAL_AUTH_FACEBOOK_KEY = ''
+#SOCIAL_AUTH_FACEBOOK_SECRET = ''
+#SOCIAL_AUTH_GITHUB_SECURE_KEY = ''
+#SOCIAL_AUTH_GITHUB_SECURE_SECRET = ''
+#SOCIAL_AUTH_DROPBOX_OAUTH2_KEY = ''
+#SOCIAL_AUTH_DROPBOX_OAUTH2_SECRET = ''
+
+## ======== Custom Configuration ========
+# You may add whatever django configuration you would like here.
+# Do try to keep it separate so you can quickly patch in new settings.
diff --git a/dmoj/routing.py b/dmoj/routing.py
new file mode 100644
index 0000000..42238b7
--- /dev/null
+++ b/dmoj/routing.py
@@ -0,0 +1,13 @@
+import chat_box.routing
+from channels.auth import AuthMiddlewareStack
+from channels.routing import ProtocolTypeRouter, URLRouter
+
+
+application = ProtocolTypeRouter({
+    # (http->django views is added by default)
+    'websocket': AuthMiddlewareStack(
+        URLRouter(
+            chat_box.routing.websocket_urlpatterns,
+        ),
+    ),
+})
diff --git a/dmoj/settings.py b/dmoj/settings.py
index 2625cfa..1e9ab27 100644
--- a/dmoj/settings.py
+++ b/dmoj/settings.py
@@ -236,6 +236,8 @@ INSTALLED_APPS += (
     'statici18n',
     'impersonate',
     'django_jinja',
+    'chat_box',
+    'channels',
 )
 
 MIDDLEWARE = (
@@ -495,3 +497,18 @@ try:
         exec(f.read(), globals())
 except IOError:
     pass
+
+TESTCASE_VISIBLE_LENGTH = 60
+
+DATA_UPLOAD_MAX_NUMBER_FIELDS = 10240
+DATA_UPLOAD_MAX_MEMORY_SIZE = 2621440
+
+ASGI_APPLICATION = 'dmoj.routing.application'
+CHANNEL_LAYERS = {
+    'default': {
+        'BACKEND': 'channels_redis.core.RedisChannelLayer',
+        'CONFIG': {
+            "hosts": [('0.0.0.0', 6379)],
+        },
+    },
+}
diff --git a/dmoj/urls.py b/dmoj/urls.py
index c56ed27..23cdb9c 100644
--- a/dmoj/urls.py
+++ b/dmoj/urls.py
@@ -1,3 +1,4 @@
+from chat_box.views import ChatView
 from django.conf import settings
 from django.conf.urls import include, url
 from django.contrib import admin
@@ -14,9 +15,9 @@ from judge.feed import AtomBlogFeed, AtomCommentFeed, AtomProblemFeed, BlogFeed,
 from judge.forms import CustomAuthenticationForm
 from judge.sitemap import BlogPostSitemap, ContestSitemap, HomePageSitemap, OrganizationSitemap, ProblemSitemap, \
     SolutionSitemap, UrlSitemap, UserSitemap
-from judge.views import TitledTemplateView, api, blog, comment, contests, language, license, mailgun, organization, \
-    preview, problem, problem_manage, ranked_submission, register, stats, status, submission, tasks, ticket, totp, \
-    user, widgets
+from judge.views import TitledTemplateView, about, api, blog, comment, contests, language, license, mailgun, \
+    organization, preview, problem, problem_manage, ranked_submission, register, stats, status, submission, tasks, \
+    ticket, totp, user, widgets
 from judge.views.problem_data import ProblemDataView, ProblemSubmissionDiff, \
     problem_data_file, problem_init_view
 from judge.views.register import ActivationView, RegistrationView
@@ -24,6 +25,7 @@ from judge.views.select2 import AssigneeSelect2View, CommentSelect2View, Contest
     ContestUserSearchSelect2View, OrganizationSelect2View, ProblemSelect2View, TicketUserSelect2View, \
     UserSearchSelect2View, UserSelect2View
 
+
 admin.autodiscover()
 
 register_patterns = [
@@ -360,6 +362,12 @@ urlpatterns = [
         url(r'^failure$', tasks.demo_failure),
         url(r'^progress$', tasks.demo_progress),
     ])),
+
+    url(r'^about/', about.about, name='about'),
+
+    url(r'^custom_checker_sample/', about.custom_checker_sample, name='custom_checker_sample'),
+
+    url(r'chat/', ChatView.as_view(), name='chat'),
 ]
 
 favicon_paths = ['apple-touch-icon-180x180.png', 'apple-touch-icon-114x114.png', 'android-chrome-72x72.png',
diff --git a/judge/fixtures/navbar.json b/judge/fixtures/navbar.json
index d43868d..2d7ac2c 100644
--- a/judge/fixtures/navbar.json
+++ b/judge/fixtures/navbar.json
@@ -74,7 +74,7 @@
             "path": "/about/",
             "regex": "^/about/$",
             "rght": 4,
-            "tree_id": 5
+            "tree_id": 6
         },
         "model": "judge.navigationbar",
         "pk": 6
@@ -90,9 +90,25 @@
             "path": "/status/",
             "regex": "^/status/$|^/judge/",
             "rght": 3,
-            "tree_id": 5
+            "tree_id": 6
         },
         "model": "judge.navigationbar",
         "pk": 7
+    },
+    {
+        "fields": {
+            "key": "chat",
+            "label": "Chat",
+            "level": 0,
+            "lft": 1,
+            "order": 8,
+            "parent": null,
+            "path": "/chat/",
+            "regex": "^/chat",
+            "rght": 2,
+            "tree_id": 5
+        },
+        "model": "judge.navigationbar",
+        "pk": 8
     }
 ]
diff --git a/judge/migrations/0098_auto_20200123_2136.py b/judge/migrations/0098_auto_20200123_2136.py
new file mode 100644
index 0000000..333c67c
--- /dev/null
+++ b/judge/migrations/0098_auto_20200123_2136.py
@@ -0,0 +1,155 @@
+# Generated by Django 2.2.9 on 2020-01-23 21:36
+
+import django.core.validators
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('judge', '0097_participation_is_disqualified'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='comment',
+            name='level',
+            field=models.PositiveIntegerField(editable=False),
+        ),
+        migrations.AlterField(
+            model_name='comment',
+            name='lft',
+            field=models.PositiveIntegerField(editable=False),
+        ),
+        migrations.AlterField(
+            model_name='comment',
+            name='rght',
+            field=models.PositiveIntegerField(editable=False),
+        ),
+        migrations.AlterField(
+            model_name='contest',
+            name='format_name',
+            field=models.CharField(choices=[('atcoder', 'AtCoder'), ('default', 'Default'), ('ecoo', 'ECOO'), ('ioi', 'IOI')], default='default', help_text='The contest format module to use.', max_length=32, verbose_name='contest format'),
+        ),
+        migrations.AlterField(
+            model_name='judge',
+            name='auth_key',
+            field=models.CharField(help_text='A key to authenticate this judge', max_length=100, verbose_name='authentication key'),
+        ),
+        migrations.AlterField(
+            model_name='language',
+            name='description',
+            field=models.TextField(blank=True, help_text='Use this field to inform users of quirks with your environment, additional restrictions, etc.', verbose_name='language description'),
+        ),
+        migrations.AlterField(
+            model_name='languagelimit',
+            name='memory_limit',
+            field=models.IntegerField(validators=[django.core.validators.MinValueValidator(0), django.core.validators.MaxValueValidator(1048576)], verbose_name='memory limit'),
+        ),
+        migrations.AlterField(
+            model_name='languagelimit',
+            name='time_limit',
+            field=models.FloatField(validators=[django.core.validators.MinValueValidator(0), django.core.validators.MaxValueValidator(60)], verbose_name='time limit'),
+        ),
+        migrations.AlterField(
+            model_name='navigationbar',
+            name='level',
+            field=models.PositiveIntegerField(editable=False),
+        ),
+        migrations.AlterField(
+            model_name='navigationbar',
+            name='lft',
+            field=models.PositiveIntegerField(editable=False),
+        ),
+        migrations.AlterField(
+            model_name='navigationbar',
+            name='rght',
+            field=models.PositiveIntegerField(editable=False),
+        ),
+        migrations.AlterField(
+            model_name='problem',
+            name='allowed_languages',
+            field=models.ManyToManyField(help_text='List of allowed submission languages.', to='judge.Language', verbose_name='allowed languages'),
+        ),
+        migrations.AlterField(
+            model_name='problem',
+            name='authors',
+            field=models.ManyToManyField(blank=True, help_text='These users will be able to edit the problem, and be listed as authors.', related_name='authored_problems', to='judge.Profile', verbose_name='creators'),
+        ),
+        migrations.AlterField(
+            model_name='problem',
+            name='code',
+            field=models.CharField(help_text='A short, unique code for the problem, used in the url after /problem/', max_length=20, unique=True, validators=[django.core.validators.RegexValidator('^[a-z0-9]+$', 'Problem code must be ^[a-z0-9]+$')], verbose_name='problem code'),
+        ),
+        migrations.AlterField(
+            model_name='problem',
+            name='curators',
+            field=models.ManyToManyField(blank=True, help_text='These users will be able to edit the problem, but not be listed as authors.', related_name='curated_problems', to='judge.Profile', verbose_name='curators'),
+        ),
+        migrations.AlterField(
+            model_name='problem',
+            name='group',
+            field=models.ForeignKey(help_text='The group of problem, shown under Category in the problem list.', on_delete=django.db.models.deletion.CASCADE, to='judge.ProblemGroup', verbose_name='problem group'),
+        ),
+        migrations.AlterField(
+            model_name='problem',
+            name='is_manually_managed',
+            field=models.BooleanField(db_index=True, default=False, help_text='Whether judges should be allowed to manage data or not.', verbose_name='manually managed'),
+        ),
+        migrations.AlterField(
+            model_name='problem',
+            name='license',
+            field=models.ForeignKey(blank=True, help_text='The license under which this problem is published.', null=True, on_delete=django.db.models.deletion.SET_NULL, to='judge.License'),
+        ),
+        migrations.AlterField(
+            model_name='problem',
+            name='memory_limit',
+            field=models.PositiveIntegerField(help_text='The memory limit for this problem, in kilobytes (e.g. 64mb = 65536 kilobytes).', validators=[django.core.validators.MinValueValidator(0), django.core.validators.MaxValueValidator(1048576)], verbose_name='memory limit'),
+        ),
+        migrations.AlterField(
+            model_name='problem',
+            name='name',
+            field=models.CharField(db_index=True, help_text='The full name of the problem, as shown in the problem list.', max_length=100, verbose_name='problem name'),
+        ),
+        migrations.AlterField(
+            model_name='problem',
+            name='points',
+            field=models.FloatField(help_text="Points awarded for problem completion. Points are displayed with a 'p' suffix if partial.", validators=[django.core.validators.MinValueValidator(0)], verbose_name='points'),
+        ),
+        migrations.AlterField(
+            model_name='problem',
+            name='testers',
+            field=models.ManyToManyField(blank=True, help_text='These users will be able to view the private problem, but not edit it.', related_name='tested_problems', to='judge.Profile', verbose_name='testers'),
+        ),
+        migrations.AlterField(
+            model_name='problem',
+            name='time_limit',
+            field=models.FloatField(help_text='The time limit for this problem, in seconds. Fractional seconds (e.g. 1.5) are supported.', validators=[django.core.validators.MinValueValidator(0), django.core.validators.MaxValueValidator(60)], verbose_name='time limit'),
+        ),
+        migrations.AlterField(
+            model_name='problem',
+            name='types',
+            field=models.ManyToManyField(help_text="The type of problem, as shown on the problem's page.", to='judge.ProblemType', verbose_name='problem types'),
+        ),
+        migrations.AlterField(
+            model_name='problemdata',
+            name='checker',
+            field=models.CharField(blank=True, choices=[('standard', 'Standard'), ('floats', 'Floats'), ('floatsabs', 'Floats (absolute)'), ('floatsrel', 'Floats (relative)'), ('rstripped', 'Non-trailing spaces'), ('sorted', 'Unordered'), ('identical', 'Byte identical'), ('linecount', 'Line-by-line'), ('checker.py', 'Custom checker')], max_length=10, verbose_name='checker'),
+        ),
+        migrations.AlterField(
+            model_name='problemtestcase',
+            name='checker',
+            field=models.CharField(blank=True, choices=[('standard', 'Standard'), ('floats', 'Floats'), ('floatsabs', 'Floats (absolute)'), ('floatsrel', 'Floats (relative)'), ('rstripped', 'Non-trailing spaces'), ('sorted', 'Unordered'), ('identical', 'Byte identical'), ('linecount', 'Line-by-line'), ('checker.py', 'Custom checker')], max_length=10, verbose_name='checker'),
+        ),
+        migrations.AlterField(
+            model_name='problemtranslation',
+            name='language',
+            field=models.CharField(choices=[('de', 'German'), ('en', 'English'), ('es', 'Spanish'), ('fr', 'French'), ('hr', 'Croatian'), ('hu', 'Hungarian'), ('ja', 'Japanese'), ('ko', 'Korean'), ('pt', 'Brazilian Portuguese'), ('ro', 'Romanian'), ('ru', 'Russian'), ('sr-latn', 'Serbian (Latin)'), ('tr', 'Turkish'), ('vi', 'Vietnamese'), ('zh-hans', 'Simplified Chinese'), ('zh-hant', 'Traditional Chinese')], max_length=7, verbose_name='language'),
+        ),
+        migrations.AlterField(
+            model_name='profile',
+            name='timezone',
+            field=models.CharField(choices=[('Africa', [('Africa/Abidjan', 'Abidjan'), ('Africa/Accra', 'Accra'), ('Africa/Addis_Ababa', 'Addis_Ababa'), ('Africa/Algiers', 'Algiers'), ('Africa/Asmara', 'Asmara'), ('Africa/Asmera', 'Asmera'), ('Africa/Bamako', 'Bamako'), ('Africa/Bangui', 'Bangui'), ('Africa/Banjul', 'Banjul'), ('Africa/Bissau', 'Bissau'), ('Africa/Blantyre', 'Blantyre'), ('Africa/Brazzaville', 'Brazzaville'), ('Africa/Bujumbura', 'Bujumbura'), ('Africa/Cairo', 'Cairo'), ('Africa/Casablanca', 'Casablanca'), ('Africa/Ceuta', 'Ceuta'), ('Africa/Conakry', 'Conakry'), ('Africa/Dakar', 'Dakar'), ('Africa/Dar_es_Salaam', 'Dar_es_Salaam'), ('Africa/Djibouti', 'Djibouti'), ('Africa/Douala', 'Douala'), ('Africa/El_Aaiun', 'El_Aaiun'), ('Africa/Freetown', 'Freetown'), ('Africa/Gaborone', 'Gaborone'), ('Africa/Harare', 'Harare'), ('Africa/Johannesburg', 'Johannesburg'), ('Africa/Juba', 'Juba'), ('Africa/Kampala', 'Kampala'), ('Africa/Khartoum', 'Khartoum'), ('Africa/Kigali', 'Kigali'), ('Africa/Kinshasa', 'Kinshasa'), ('Africa/Lagos', 'Lagos'), ('Africa/Libreville', 'Libreville'), ('Africa/Lome', 'Lome'), ('Africa/Luanda', 'Luanda'), ('Africa/Lubumbashi', 'Lubumbashi'), ('Africa/Lusaka', 'Lusaka'), ('Africa/Malabo', 'Malabo'), ('Africa/Maputo', 'Maputo'), ('Africa/Maseru', 'Maseru'), ('Africa/Mbabane', 'Mbabane'), ('Africa/Mogadishu', 'Mogadishu'), ('Africa/Monrovia', 'Monrovia'), ('Africa/Nairobi', 'Nairobi'), ('Africa/Ndjamena', 'Ndjamena'), ('Africa/Niamey', 'Niamey'), ('Africa/Nouakchott', 'Nouakchott'), ('Africa/Ouagadougou', 'Ouagadougou'), ('Africa/Porto-Novo', 'Porto-Novo'), ('Africa/Sao_Tome', 'Sao_Tome'), ('Africa/Timbuktu', 'Timbuktu'), ('Africa/Tripoli', 'Tripoli'), ('Africa/Tunis', 'Tunis'), ('Africa/Windhoek', 'Windhoek')]), ('America', [('America/Adak', 'Adak'), ('America/Anchorage', 'Anchorage'), ('America/Anguilla', 'Anguilla'), ('America/Antigua', 'Antigua'), ('America/Araguaina', 'Araguaina'), ('America/Argentina/Buenos_Aires', 'Argentina/Buenos_Aires'), ('America/Argentina/Catamarca', 'Argentina/Catamarca'), ('America/Argentina/ComodRivadavia', 'Argentina/ComodRivadavia'), ('America/Argentina/Cordoba', 'Argentina/Cordoba'), ('America/Argentina/Jujuy', 'Argentina/Jujuy'), ('America/Argentina/La_Rioja', 'Argentina/La_Rioja'), ('America/Argentina/Mendoza', 'Argentina/Mendoza'), ('America/Argentina/Rio_Gallegos', 'Argentina/Rio_Gallegos'), ('America/Argentina/Salta', 'Argentina/Salta'), ('America/Argentina/San_Juan', 'Argentina/San_Juan'), ('America/Argentina/San_Luis', 'Argentina/San_Luis'), ('America/Argentina/Tucuman', 'Argentina/Tucuman'), ('America/Argentina/Ushuaia', 'Argentina/Ushuaia'), ('America/Aruba', 'Aruba'), ('America/Asuncion', 'Asuncion'), ('America/Atikokan', 'Atikokan'), ('America/Atka', 'Atka'), ('America/Bahia', 'Bahia'), ('America/Bahia_Banderas', 'Bahia_Banderas'), ('America/Barbados', 'Barbados'), ('America/Belem', 'Belem'), ('America/Belize', 'Belize'), ('America/Blanc-Sablon', 'Blanc-Sablon'), ('America/Boa_Vista', 'Boa_Vista'), ('America/Bogota', 'Bogota'), ('America/Boise', 'Boise'), ('America/Buenos_Aires', 'Buenos_Aires'), ('America/Cambridge_Bay', 'Cambridge_Bay'), ('America/Campo_Grande', 'Campo_Grande'), ('America/Cancun', 'Cancun'), ('America/Caracas', 'Caracas'), ('America/Catamarca', 'Catamarca'), ('America/Cayenne', 'Cayenne'), ('America/Cayman', 'Cayman'), ('America/Chicago', 'Chicago'), ('America/Chihuahua', 'Chihuahua'), ('America/Coral_Harbour', 'Coral_Harbour'), ('America/Cordoba', 'Cordoba'), ('America/Costa_Rica', 'Costa_Rica'), ('America/Creston', 'Creston'), ('America/Cuiaba', 'Cuiaba'), ('America/Curacao', 'Curacao'), ('America/Danmarkshavn', 'Danmarkshavn'), ('America/Dawson', 'Dawson'), ('America/Dawson_Creek', 'Dawson_Creek'), ('America/Denver', 'Denver'), ('America/Detroit', 'Detroit'), ('America/Dominica', 'Dominica'), ('America/Edmonton', 'Edmonton'), ('America/Eirunepe', 'Eirunepe'), ('America/El_Salvador', 'El_Salvador'), ('America/Ensenada', 'Ensenada'), ('America/Fort_Nelson', 'Fort_Nelson'), ('America/Fort_Wayne', 'Fort_Wayne'), ('America/Fortaleza', 'Fortaleza'), ('America/Glace_Bay', 'Glace_Bay'), ('America/Godthab', 'Godthab'), ('America/Goose_Bay', 'Goose_Bay'), ('America/Grand_Turk', 'Grand_Turk'), ('America/Grenada', 'Grenada'), ('America/Guadeloupe', 'Guadeloupe'), ('America/Guatemala', 'Guatemala'), ('America/Guayaquil', 'Guayaquil'), ('America/Guyana', 'Guyana'), ('America/Halifax', 'Halifax'), ('America/Havana', 'Havana'), ('America/Hermosillo', 'Hermosillo'), ('America/Indiana/Indianapolis', 'Indiana/Indianapolis'), ('America/Indiana/Knox', 'Indiana/Knox'), ('America/Indiana/Marengo', 'Indiana/Marengo'), ('America/Indiana/Petersburg', 'Indiana/Petersburg'), ('America/Indiana/Tell_City', 'Indiana/Tell_City'), ('America/Indiana/Vevay', 'Indiana/Vevay'), ('America/Indiana/Vincennes', 'Indiana/Vincennes'), ('America/Indiana/Winamac', 'Indiana/Winamac'), ('America/Indianapolis', 'Indianapolis'), ('America/Inuvik', 'Inuvik'), ('America/Iqaluit', 'Iqaluit'), ('America/Jamaica', 'Jamaica'), ('America/Jujuy', 'Jujuy'), ('America/Juneau', 'Juneau'), ('America/Kentucky/Louisville', 'Kentucky/Louisville'), ('America/Kentucky/Monticello', 'Kentucky/Monticello'), ('America/Knox_IN', 'Knox_IN'), ('America/Kralendijk', 'Kralendijk'), ('America/La_Paz', 'La_Paz'), ('America/Lima', 'Lima'), ('America/Los_Angeles', 'Los_Angeles'), ('America/Louisville', 'Louisville'), ('America/Lower_Princes', 'Lower_Princes'), ('America/Maceio', 'Maceio'), ('America/Managua', 'Managua'), ('America/Manaus', 'Manaus'), ('America/Marigot', 'Marigot'), ('America/Martinique', 'Martinique'), ('America/Matamoros', 'Matamoros'), ('America/Mazatlan', 'Mazatlan'), ('America/Mendoza', 'Mendoza'), ('America/Menominee', 'Menominee'), ('America/Merida', 'Merida'), ('America/Metlakatla', 'Metlakatla'), ('America/Mexico_City', 'Mexico_City'), ('America/Miquelon', 'Miquelon'), ('America/Moncton', 'Moncton'), ('America/Monterrey', 'Monterrey'), ('America/Montevideo', 'Montevideo'), ('America/Montreal', 'Montreal'), ('America/Montserrat', 'Montserrat'), ('America/Nassau', 'Nassau'), ('America/New_York', 'New_York'), ('America/Nipigon', 'Nipigon'), ('America/Nome', 'Nome'), ('America/Noronha', 'Noronha'), ('America/North_Dakota/Beulah', 'North_Dakota/Beulah'), ('America/North_Dakota/Center', 'North_Dakota/Center'), ('America/North_Dakota/New_Salem', 'North_Dakota/New_Salem'), ('America/Ojinaga', 'Ojinaga'), ('America/Panama', 'Panama'), ('America/Pangnirtung', 'Pangnirtung'), ('America/Paramaribo', 'Paramaribo'), ('America/Phoenix', 'Phoenix'), ('America/Port-au-Prince', 'Port-au-Prince'), ('America/Port_of_Spain', 'Port_of_Spain'), ('America/Porto_Acre', 'Porto_Acre'), ('America/Porto_Velho', 'Porto_Velho'), ('America/Puerto_Rico', 'Puerto_Rico'), ('America/Punta_Arenas', 'Punta_Arenas'), ('America/Rainy_River', 'Rainy_River'), ('America/Rankin_Inlet', 'Rankin_Inlet'), ('America/Recife', 'Recife'), ('America/Regina', 'Regina'), ('America/Resolute', 'Resolute'), ('America/Rio_Branco', 'Rio_Branco'), ('America/Rosario', 'Rosario'), ('America/Santa_Isabel', 'Santa_Isabel'), ('America/Santarem', 'Santarem'), ('America/Santiago', 'Santiago'), ('America/Santo_Domingo', 'Santo_Domingo'), ('America/Sao_Paulo', 'Sao_Paulo'), ('America/Scoresbysund', 'Scoresbysund'), ('America/Shiprock', 'Shiprock'), ('America/Sitka', 'Sitka'), ('America/St_Barthelemy', 'St_Barthelemy'), ('America/St_Johns', 'St_Johns'), ('America/St_Kitts', 'St_Kitts'), ('America/St_Lucia', 'St_Lucia'), ('America/St_Thomas', 'St_Thomas'), ('America/St_Vincent', 'St_Vincent'), ('America/Swift_Current', 'Swift_Current'), ('America/Tegucigalpa', 'Tegucigalpa'), ('America/Thule', 'Thule'), ('America/Thunder_Bay', 'Thunder_Bay'), ('America/Tijuana', 'Tijuana'), ('America/Toronto', 'Toronto'), ('America/Tortola', 'Tortola'), ('America/Vancouver', 'Vancouver'), ('America/Virgin', 'Virgin'), ('America/Whitehorse', 'Whitehorse'), ('America/Winnipeg', 'Winnipeg'), ('America/Yakutat', 'Yakutat'), ('America/Yellowknife', 'Yellowknife')]), ('Antarctica', [('Antarctica/Casey', 'Casey'), ('Antarctica/Davis', 'Davis'), ('Antarctica/DumontDUrville', 'DumontDUrville'), ('Antarctica/Macquarie', 'Macquarie'), ('Antarctica/Mawson', 'Mawson'), ('Antarctica/McMurdo', 'McMurdo'), ('Antarctica/Palmer', 'Palmer'), ('Antarctica/Rothera', 'Rothera'), ('Antarctica/South_Pole', 'South_Pole'), ('Antarctica/Syowa', 'Syowa'), ('Antarctica/Troll', 'Troll'), ('Antarctica/Vostok', 'Vostok')]), ('Arctic', [('Arctic/Longyearbyen', 'Longyearbyen')]), ('Asia', [('Asia/Aden', 'Aden'), ('Asia/Almaty', 'Almaty'), ('Asia/Amman', 'Amman'), ('Asia/Anadyr', 'Anadyr'), ('Asia/Aqtau', 'Aqtau'), ('Asia/Aqtobe', 'Aqtobe'), ('Asia/Ashgabat', 'Ashgabat'), ('Asia/Ashkhabad', 'Ashkhabad'), ('Asia/Atyrau', 'Atyrau'), ('Asia/Baghdad', 'Baghdad'), ('Asia/Bahrain', 'Bahrain'), ('Asia/Baku', 'Baku'), ('Asia/Bangkok', 'Bangkok'), ('Asia/Barnaul', 'Barnaul'), ('Asia/Beirut', 'Beirut'), ('Asia/Bishkek', 'Bishkek'), ('Asia/Brunei', 'Brunei'), ('Asia/Calcutta', 'Calcutta'), ('Asia/Chita', 'Chita'), ('Asia/Choibalsan', 'Choibalsan'), ('Asia/Chongqing', 'Chongqing'), ('Asia/Chungking', 'Chungking'), ('Asia/Colombo', 'Colombo'), ('Asia/Dacca', 'Dacca'), ('Asia/Damascus', 'Damascus'), ('Asia/Dhaka', 'Dhaka'), ('Asia/Dili', 'Dili'), ('Asia/Dubai', 'Dubai'), ('Asia/Dushanbe', 'Dushanbe'), ('Asia/Famagusta', 'Famagusta'), ('Asia/Gaza', 'Gaza'), ('Asia/Harbin', 'Harbin'), ('Asia/Hebron', 'Hebron'), ('Asia/Ho_Chi_Minh', 'Ho_Chi_Minh'), ('Asia/Hong_Kong', 'Hong_Kong'), ('Asia/Hovd', 'Hovd'), ('Asia/Irkutsk', 'Irkutsk'), ('Asia/Istanbul', 'Istanbul'), ('Asia/Jakarta', 'Jakarta'), ('Asia/Jayapura', 'Jayapura'), ('Asia/Jerusalem', 'Jerusalem'), ('Asia/Kabul', 'Kabul'), ('Asia/Kamchatka', 'Kamchatka'), ('Asia/Karachi', 'Karachi'), ('Asia/Kashgar', 'Kashgar'), ('Asia/Kathmandu', 'Kathmandu'), ('Asia/Katmandu', 'Katmandu'), ('Asia/Khandyga', 'Khandyga'), ('Asia/Kolkata', 'Kolkata'), ('Asia/Krasnoyarsk', 'Krasnoyarsk'), ('Asia/Kuala_Lumpur', 'Kuala_Lumpur'), ('Asia/Kuching', 'Kuching'), ('Asia/Kuwait', 'Kuwait'), ('Asia/Macao', 'Macao'), ('Asia/Macau', 'Macau'), ('Asia/Magadan', 'Magadan'), ('Asia/Makassar', 'Makassar'), ('Asia/Manila', 'Manila'), ('Asia/Muscat', 'Muscat'), ('Asia/Nicosia', 'Nicosia'), ('Asia/Novokuznetsk', 'Novokuznetsk'), ('Asia/Novosibirsk', 'Novosibirsk'), ('Asia/Omsk', 'Omsk'), ('Asia/Oral', 'Oral'), ('Asia/Phnom_Penh', 'Phnom_Penh'), ('Asia/Pontianak', 'Pontianak'), ('Asia/Pyongyang', 'Pyongyang'), ('Asia/Qatar', 'Qatar'), ('Asia/Qostanay', 'Qostanay'), ('Asia/Qyzylorda', 'Qyzylorda'), ('Asia/Rangoon', 'Rangoon'), ('Asia/Riyadh', 'Riyadh'), ('Asia/Saigon', 'Saigon'), ('Asia/Sakhalin', 'Sakhalin'), ('Asia/Samarkand', 'Samarkand'), ('Asia/Seoul', 'Seoul'), ('Asia/Shanghai', 'Shanghai'), ('Asia/Singapore', 'Singapore'), ('Asia/Srednekolymsk', 'Srednekolymsk'), ('Asia/Taipei', 'Taipei'), ('Asia/Tashkent', 'Tashkent'), ('Asia/Tbilisi', 'Tbilisi'), ('Asia/Tehran', 'Tehran'), ('Asia/Tel_Aviv', 'Tel_Aviv'), ('Asia/Thimbu', 'Thimbu'), ('Asia/Thimphu', 'Thimphu'), ('Asia/Tokyo', 'Tokyo'), ('Asia/Tomsk', 'Tomsk'), ('Asia/Ujung_Pandang', 'Ujung_Pandang'), ('Asia/Ulaanbaatar', 'Ulaanbaatar'), ('Asia/Ulan_Bator', 'Ulan_Bator'), ('Asia/Urumqi', 'Urumqi'), ('Asia/Ust-Nera', 'Ust-Nera'), ('Asia/Vientiane', 'Vientiane'), ('Asia/Vladivostok', 'Vladivostok'), ('Asia/Yakutsk', 'Yakutsk'), ('Asia/Yangon', 'Yangon'), ('Asia/Yekaterinburg', 'Yekaterinburg'), ('Asia/Yerevan', 'Yerevan')]), ('Atlantic', [('Atlantic/Azores', 'Azores'), ('Atlantic/Bermuda', 'Bermuda'), ('Atlantic/Canary', 'Canary'), ('Atlantic/Cape_Verde', 'Cape_Verde'), ('Atlantic/Faeroe', 'Faeroe'), ('Atlantic/Faroe', 'Faroe'), ('Atlantic/Jan_Mayen', 'Jan_Mayen'), ('Atlantic/Madeira', 'Madeira'), ('Atlantic/Reykjavik', 'Reykjavik'), ('Atlantic/South_Georgia', 'South_Georgia'), ('Atlantic/St_Helena', 'St_Helena'), ('Atlantic/Stanley', 'Stanley')]), ('Australia', [('Australia/ACT', 'ACT'), ('Australia/Adelaide', 'Adelaide'), ('Australia/Brisbane', 'Brisbane'), ('Australia/Broken_Hill', 'Broken_Hill'), ('Australia/Canberra', 'Canberra'), ('Australia/Currie', 'Currie'), ('Australia/Darwin', 'Darwin'), ('Australia/Eucla', 'Eucla'), ('Australia/Hobart', 'Hobart'), ('Australia/LHI', 'LHI'), ('Australia/Lindeman', 'Lindeman'), ('Australia/Lord_Howe', 'Lord_Howe'), ('Australia/Melbourne', 'Melbourne'), ('Australia/NSW', 'NSW'), ('Australia/North', 'North'), ('Australia/Perth', 'Perth'), ('Australia/Queensland', 'Queensland'), ('Australia/South', 'South'), ('Australia/Sydney', 'Sydney'), ('Australia/Tasmania', 'Tasmania'), ('Australia/Victoria', 'Victoria'), ('Australia/West', 'West'), ('Australia/Yancowinna', 'Yancowinna')]), ('Brazil', [('Brazil/Acre', 'Acre'), ('Brazil/DeNoronha', 'DeNoronha'), ('Brazil/East', 'East'), ('Brazil/West', 'West')]), ('Canada', [('Canada/Atlantic', 'Atlantic'), ('Canada/Central', 'Central'), ('Canada/Eastern', 'Eastern'), ('Canada/Mountain', 'Mountain'), ('Canada/Newfoundland', 'Newfoundland'), ('Canada/Pacific', 'Pacific'), ('Canada/Saskatchewan', 'Saskatchewan'), ('Canada/Yukon', 'Yukon')]), ('Chile', [('Chile/Continental', 'Continental'), ('Chile/EasterIsland', 'EasterIsland')]), ('Etc', [('Etc/Greenwich', 'Greenwich'), ('Etc/UCT', 'UCT'), ('Etc/UTC', 'UTC'), ('Etc/Universal', 'Universal'), ('Etc/Zulu', 'Zulu')]), ('Europe', [('Europe/Amsterdam', 'Amsterdam'), ('Europe/Andorra', 'Andorra'), ('Europe/Astrakhan', 'Astrakhan'), ('Europe/Athens', 'Athens'), ('Europe/Belfast', 'Belfast'), ('Europe/Belgrade', 'Belgrade'), ('Europe/Berlin', 'Berlin'), ('Europe/Bratislava', 'Bratislava'), ('Europe/Brussels', 'Brussels'), ('Europe/Bucharest', 'Bucharest'), ('Europe/Budapest', 'Budapest'), ('Europe/Busingen', 'Busingen'), ('Europe/Chisinau', 'Chisinau'), ('Europe/Copenhagen', 'Copenhagen'), ('Europe/Dublin', 'Dublin'), ('Europe/Gibraltar', 'Gibraltar'), ('Europe/Guernsey', 'Guernsey'), ('Europe/Helsinki', 'Helsinki'), ('Europe/Isle_of_Man', 'Isle_of_Man'), ('Europe/Istanbul', 'Istanbul'), ('Europe/Jersey', 'Jersey'), ('Europe/Kaliningrad', 'Kaliningrad'), ('Europe/Kiev', 'Kiev'), ('Europe/Kirov', 'Kirov'), ('Europe/Lisbon', 'Lisbon'), ('Europe/Ljubljana', 'Ljubljana'), ('Europe/London', 'London'), ('Europe/Luxembourg', 'Luxembourg'), ('Europe/Madrid', 'Madrid'), ('Europe/Malta', 'Malta'), ('Europe/Mariehamn', 'Mariehamn'), ('Europe/Minsk', 'Minsk'), ('Europe/Monaco', 'Monaco'), ('Europe/Moscow', 'Moscow'), ('Europe/Nicosia', 'Nicosia'), ('Europe/Oslo', 'Oslo'), ('Europe/Paris', 'Paris'), ('Europe/Podgorica', 'Podgorica'), ('Europe/Prague', 'Prague'), ('Europe/Riga', 'Riga'), ('Europe/Rome', 'Rome'), ('Europe/Samara', 'Samara'), ('Europe/San_Marino', 'San_Marino'), ('Europe/Sarajevo', 'Sarajevo'), ('Europe/Saratov', 'Saratov'), ('Europe/Simferopol', 'Simferopol'), ('Europe/Skopje', 'Skopje'), ('Europe/Sofia', 'Sofia'), ('Europe/Stockholm', 'Stockholm'), ('Europe/Tallinn', 'Tallinn'), ('Europe/Tirane', 'Tirane'), ('Europe/Tiraspol', 'Tiraspol'), ('Europe/Ulyanovsk', 'Ulyanovsk'), ('Europe/Uzhgorod', 'Uzhgorod'), ('Europe/Vaduz', 'Vaduz'), ('Europe/Vatican', 'Vatican'), ('Europe/Vienna', 'Vienna'), ('Europe/Vilnius', 'Vilnius'), ('Europe/Volgograd', 'Volgograd'), ('Europe/Warsaw', 'Warsaw'), ('Europe/Zagreb', 'Zagreb'), ('Europe/Zaporozhye', 'Zaporozhye'), ('Europe/Zurich', 'Zurich')]), ('Indian', [('Indian/Antananarivo', 'Antananarivo'), ('Indian/Chagos', 'Chagos'), ('Indian/Christmas', 'Christmas'), ('Indian/Cocos', 'Cocos'), ('Indian/Comoro', 'Comoro'), ('Indian/Kerguelen', 'Kerguelen'), ('Indian/Mahe', 'Mahe'), ('Indian/Maldives', 'Maldives'), ('Indian/Mauritius', 'Mauritius'), ('Indian/Mayotte', 'Mayotte'), ('Indian/Reunion', 'Reunion')]), ('Mexico', [('Mexico/BajaNorte', 'BajaNorte'), ('Mexico/BajaSur', 'BajaSur'), ('Mexico/General', 'General')]), ('Other', [('CET', 'CET'), ('CST6CDT', 'CST6CDT'), ('Cuba', 'Cuba'), ('EET', 'EET'), ('EST', 'EST'), ('EST5EDT', 'EST5EDT'), ('Egypt', 'Egypt'), ('Eire', 'Eire'), ('GB', 'GB'), ('GB-Eire', 'GB-Eire'), ('Greenwich', 'Greenwich'), ('HST', 'HST'), ('Hongkong', 'Hongkong'), ('Iceland', 'Iceland'), ('Iran', 'Iran'), ('Israel', 'Israel'), ('Jamaica', 'Jamaica'), ('Japan', 'Japan'), ('Kwajalein', 'Kwajalein'), ('Libya', 'Libya'), ('MET', 'MET'), ('MST', 'MST'), ('MST7MDT', 'MST7MDT'), ('NZ', 'NZ'), ('NZ-CHAT', 'NZ-CHAT'), ('Navajo', 'Navajo'), ('PRC', 'PRC'), ('PST8PDT', 'PST8PDT'), ('Poland', 'Poland'), ('Portugal', 'Portugal'), ('ROC', 'ROC'), ('ROK', 'ROK'), ('Singapore', 'Singapore'), ('Turkey', 'Turkey'), ('UCT', 'UCT'), ('UTC', 'UTC'), ('Universal', 'Universal'), ('W-SU', 'W-SU'), ('WET', 'WET'), ('Zulu', 'Zulu')]), ('Pacific', [('Pacific/Apia', 'Apia'), ('Pacific/Auckland', 'Auckland'), ('Pacific/Bougainville', 'Bougainville'), ('Pacific/Chatham', 'Chatham'), ('Pacific/Chuuk', 'Chuuk'), ('Pacific/Easter', 'Easter'), ('Pacific/Efate', 'Efate'), ('Pacific/Enderbury', 'Enderbury'), ('Pacific/Fakaofo', 'Fakaofo'), ('Pacific/Fiji', 'Fiji'), ('Pacific/Funafuti', 'Funafuti'), ('Pacific/Galapagos', 'Galapagos'), ('Pacific/Gambier', 'Gambier'), ('Pacific/Guadalcanal', 'Guadalcanal'), ('Pacific/Guam', 'Guam'), ('Pacific/Honolulu', 'Honolulu'), ('Pacific/Johnston', 'Johnston'), ('Pacific/Kiritimati', 'Kiritimati'), ('Pacific/Kosrae', 'Kosrae'), ('Pacific/Kwajalein', 'Kwajalein'), ('Pacific/Majuro', 'Majuro'), ('Pacific/Marquesas', 'Marquesas'), ('Pacific/Midway', 'Midway'), ('Pacific/Nauru', 'Nauru'), ('Pacific/Niue', 'Niue'), ('Pacific/Norfolk', 'Norfolk'), ('Pacific/Noumea', 'Noumea'), ('Pacific/Pago_Pago', 'Pago_Pago'), ('Pacific/Palau', 'Palau'), ('Pacific/Pitcairn', 'Pitcairn'), ('Pacific/Pohnpei', 'Pohnpei'), ('Pacific/Ponape', 'Ponape'), ('Pacific/Port_Moresby', 'Port_Moresby'), ('Pacific/Rarotonga', 'Rarotonga'), ('Pacific/Saipan', 'Saipan'), ('Pacific/Samoa', 'Samoa'), ('Pacific/Tahiti', 'Tahiti'), ('Pacific/Tarawa', 'Tarawa'), ('Pacific/Tongatapu', 'Tongatapu'), ('Pacific/Truk', 'Truk'), ('Pacific/Wake', 'Wake'), ('Pacific/Wallis', 'Wallis'), ('Pacific/Yap', 'Yap')]), ('US', [('US/Alaska', 'Alaska'), ('US/Aleutian', 'Aleutian'), ('US/Arizona', 'Arizona'), ('US/Central', 'Central'), ('US/East-Indiana', 'East-Indiana'), ('US/Eastern', 'Eastern'), ('US/Hawaii', 'Hawaii'), ('US/Indiana-Starke', 'Indiana-Starke'), ('US/Michigan', 'Michigan'), ('US/Mountain', 'Mountain'), ('US/Pacific', 'Pacific'), ('US/Samoa', 'Samoa')])], default='America/Mexico_City', max_length=50, verbose_name='location'),
+        ),
+    ]
diff --git a/judge/migrations/0099_custom_checker.py b/judge/migrations/0099_custom_checker.py
new file mode 100644
index 0000000..b2552b7
--- /dev/null
+++ b/judge/migrations/0099_custom_checker.py
@@ -0,0 +1,30 @@
+# Generated by Django 2.2.9 on 2020-01-23 22:28
+from django.db import migrations, models
+
+import judge.models.problem_data
+import judge.utils.problem_data
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('judge', '0098_auto_20200123_2136'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='problemdata',
+            name='custom_checker',
+            field=models.FileField(blank=True, null=True, storage=judge.utils.problem_data.ProblemDataStorage(), upload_to=judge.models.problem_data.problem_directory_file, verbose_name='custom checker file'),
+        ),
+        migrations.AlterField(
+            model_name='problemdata',
+            name='checker',
+            field=models.CharField(blank=True, choices=[('standard', 'Standard'), ('floats', 'Floats'), ('floatsabs', 'Floats (absolute)'), ('floatsrel', 'Floats (relative)'), ('rstripped', 'Non-trailing spaces'), ('sorted', 'Unordered'), ('identical', 'Byte identical'), ('linecount', 'Line-by-line'), ('custom', 'Custom checker')], max_length=10, verbose_name='checker'),
+        ),
+        migrations.AlterField(
+            model_name='problemtestcase',
+            name='checker',
+            field=models.CharField(blank=True, choices=[('standard', 'Standard'), ('floats', 'Floats'), ('floatsabs', 'Floats (absolute)'), ('floatsrel', 'Floats (relative)'), ('rstripped', 'Non-trailing spaces'), ('sorted', 'Unordered'), ('identical', 'Byte identical'), ('linecount', 'Line-by-line'), ('custom', 'Custom checker')], max_length=10, verbose_name='checker'),
+        ),
+    ]
diff --git a/judge/migrations/0100_auto_20200127_0059.py b/judge/migrations/0100_auto_20200127_0059.py
new file mode 100644
index 0000000..e070f7a
--- /dev/null
+++ b/judge/migrations/0100_auto_20200127_0059.py
@@ -0,0 +1,21 @@
+# Generated by Django 2.2.9 on 2020-01-27 00:59
+
+import django.core.validators
+from django.db import migrations, models
+import judge.models.problem_data
+import judge.utils.problem_data
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('judge', '0099_custom_checker'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='problemdata',
+            name='custom_checker',
+            field=models.FileField(blank=True, null=True, storage=judge.utils.problem_data.ProblemDataStorage(), upload_to=judge.models.problem_data.problem_directory_file, validators=[django.core.validators.FileExtensionValidator(allowed_extensions=['py'])], verbose_name='custom checker file'),
+        ),
+    ]
diff --git a/judge/models/problem_data.py b/judge/models/problem_data.py
index 8ae25b7..6f6c88c 100644
--- a/judge/models/problem_data.py
+++ b/judge/models/problem_data.py
@@ -1,6 +1,7 @@
 import errno
 import os
 
+from django.core.validators import FileExtensionValidator
 from django.db import models
 from django.utils.translation import gettext_lazy as _
 
@@ -28,6 +29,7 @@ CHECKERS = (
     ('sorted', _('Unordered')),
     ('identical', _('Byte identical')),
     ('linecount', _('Line-by-line')),
+    ('custom', _('Custom checker')),
 )
 
 
@@ -44,7 +46,12 @@ class ProblemData(models.Model):
     checker = models.CharField(max_length=10, verbose_name=_('checker'), choices=CHECKERS, blank=True)
     checker_args = models.TextField(verbose_name=_('checker arguments'), blank=True,
                                     help_text=_('checker arguments as a JSON object'))
-
+    custom_checker = models.FileField(verbose_name=_('custom checker file'),
+                                      storage=problem_data_storage,
+                                      null=True,
+                                      blank=True,
+                                      upload_to=problem_directory_file,
+                                      validators=[FileExtensionValidator(allowed_extensions=['py'])])
     __original_zipfile = None
 
     def __init__(self, *args, **kwargs):
@@ -69,6 +76,8 @@ class ProblemData(models.Model):
             self.zipfile.name = _problem_directory_file(new, self.zipfile.name)
         if self.generator:
             self.generator.name = _problem_directory_file(new, self.generator.name)
+        if self.custom_checker:
+            self.custom_checker.name = _problem_directory_file(new, self.custom_checker.name)
         self.save()
     _update_code.alters_data = True
 
diff --git a/judge/utils/problem_data.py b/judge/utils/problem_data.py
index 9655f76..9c185fd 100644
--- a/judge/utils/problem_data.py
+++ b/judge/utils/problem_data.py
@@ -64,6 +64,11 @@ class ProblemDataCompiler(object):
             cases.append(batch)
 
         def make_checker(case):
+            if (case.checker == 'custom'):
+                custom_checker_path = split_path_first(case.custom_checker.name)
+                if len(custom_checker_path) != 2:
+                    raise ProblemDataError(_('How did you corrupt the custom checker path?'))
+                return(custom_checker_path[1])
             if case.checker_args:
                 return {
                     'name': case.checker,
diff --git a/judge/views/about.py b/judge/views/about.py
new file mode 100644
index 0000000..d328066
--- /dev/null
+++ b/judge/views/about.py
@@ -0,0 +1,14 @@
+from django.shortcuts import render
+from django.utils.translation import gettext as _
+
+
+def about(request):
+    return render(request, 'about/about.html', {
+        'title': _('About'),
+    })
+
+
+def custom_checker_sample(request):
+    return render(request, 'about/custom-checker-sample.html', {
+        'title': _('Custom Checker Sample'),
+    })
diff --git a/judge/views/problem_data.py b/judge/views/problem_data.py
index 0223170..2c392aa 100644
--- a/judge/views/problem_data.py
+++ b/judge/views/problem_data.py
@@ -50,7 +50,7 @@ class ProblemDataForm(ModelForm):
 
     class Meta:
         model = ProblemData
-        fields = ['zipfile', 'generator', 'output_limit', 'output_prefix', 'checker', 'checker_args']
+        fields = ['zipfile', 'generator', 'output_limit', 'output_prefix', 'checker', 'checker_args', 'custom_checker']
         widgets = {
             'checker_args': HiddenInput,
         }
diff --git a/judge/views/submission.py b/judge/views/submission.py
index bb496e6..d7ebfc0 100644
--- a/judge/views/submission.py
+++ b/judge/views/submission.py
@@ -1,28 +1,51 @@
 import json
+import os.path
+import zipfile
 from operator import attrgetter
 
 from django.conf import settings
 from django.contrib.auth.mixins import LoginRequiredMixin
 from django.core.cache import cache
-from django.core.exceptions import ImproperlyConfigured, ObjectDoesNotExist, PermissionDenied
-from django.db.models import Prefetch, Q
-from django.http import Http404, HttpResponse, HttpResponseBadRequest, HttpResponseRedirect, JsonResponse
-from django.shortcuts import get_object_or_404, render
+from django.core.exceptions import ImproperlyConfigured
+from django.core.exceptions import ObjectDoesNotExist
+from django.core.exceptions import PermissionDenied
+from django.db.models import Prefetch
+from django.db.models import Q
+from django.http import Http404
+from django.http import HttpResponse
+from django.http import HttpResponseBadRequest
+from django.http import HttpResponseRedirect
+from django.http import JsonResponse
+from django.shortcuts import get_object_or_404
+from django.shortcuts import render
 from django.urls import reverse
 from django.utils import timezone
 from django.utils.functional import cached_property
-from django.utils.html import escape, format_html
+from django.utils.html import escape
+from django.utils.html import format_html
 from django.utils.safestring import mark_safe
-from django.utils.translation import gettext as _, gettext_lazy
+from django.utils.translation import gettext as _
+from django.utils.translation import gettext_lazy
 from django.views.decorators.http import require_POST
-from django.views.generic import DetailView, ListView
+from django.views.generic import DetailView
+from django.views.generic import ListView
 
 from judge import event_poster as event
 from judge.highlight_code import highlight_code
-from judge.models import Contest, Language, Problem, ProblemTranslation, Profile, Submission
-from judge.utils.problems import get_result_data, user_authored_ids, user_completed_ids, user_editable_ids
+from judge.models import Contest
+from judge.models import Language
+from judge.models import Problem
+from judge.models import ProblemTestCase
+from judge.models import ProblemTranslation
+from judge.models import Profile
+from judge.models import Submission
+from judge.utils.problems import get_result_data
+from judge.utils.problems import user_authored_ids
+from judge.utils.problems import user_completed_ids
+from judge.utils.problems import user_editable_ids
 from judge.utils.raw_sql import use_straight_join
-from judge.utils.views import DiggPaginatorMixin, TitleMixin
+from judge.utils.views import DiggPaginatorMixin
+from judge.utils.views import TitleMixin
 
 
 def submission_related(queryset):
@@ -66,10 +89,12 @@ class SubmissionDetailBase(LoginRequiredMixin, TitleMixin, SubmissionMixin, Deta
         submission = self.object
         return mark_safe(escape(_('Submission of %(problem)s by %(user)s')) % {
             'problem': format_html('<a href="{0}">{1}</a>',
-                                   reverse('problem_detail', args=[submission.problem.code]),
+                                   reverse('problem_detail', args=[
+                                           submission.problem.code]),
                                    submission.problem.translated_name(self.request.LANGUAGE_CODE)),
             'user': format_html('<a href="{0}">{1}</a>',
-                                reverse('user_page', args=[submission.user.user.username]),
+                                reverse('user_page', args=[
+                                        submission.user.user.username]),
                                 submission.user.user.username),
         })
 
@@ -84,7 +109,8 @@ class SubmissionSource(SubmissionDetailBase):
         context = super(SubmissionSource, self).get_context_data(**kwargs)
         submission = self.object
         context['raw_source'] = submission.source.source.rstrip('\n')
-        context['highlighted_source'] = highlight_code(submission.source.source, submission.language.pygments)
+        context['highlighted_source'] = highlight_code(
+            submission.source.source, submission.language.pygments)
         return context
 
 
@@ -111,6 +137,42 @@ def group_test_cases(cases):
     return result
 
 
+def get_visible_content(data):
+    data = data or b''
+    data = data.replace(b'\r\n', b'\r').replace(b'\r', b'\n')
+    if (len(data) > settings.TESTCASE_VISIBLE_LENGTH):
+        data = data[:settings.TESTCASE_VISIBLE_LENGTH]
+        data += b'.' * 3
+    elif not data.endswith(b'\n'):
+        data += b'\n'
+    return data.decode('utf-8')
+
+
+def get_input_answer(case, archive):
+    result = {}
+    result['input'] = get_visible_content(archive.read(case.input_file))
+    result['answer'] = get_visible_content(archive.read(case.output_file))
+    return result
+
+
+def get_problem_data(submission):
+    archive_path = os.path.join(settings.DMOJ_PROBLEM_DATA_ROOT,
+                                str(submission.problem.data_files.zipfile))
+    if not os.path.exists(archive_path):
+        raise Exception(
+            'archive file "%s" does not exist' % archive_path)
+    try:
+        archive = zipfile.ZipFile(archive_path, 'r')
+    except zipfile.BadZipfile:
+        raise Exception('bad archive: "%s"' % archive_path)
+    testcases = ProblemTestCase.objects.filter(dataset=submission.problem)\
+        .order_by('order')
+
+    problem_data = {case.order: get_input_answer(case, archive)
+                    for case in testcases}
+    return problem_data
+
+
 class SubmissionStatus(SubmissionDetailBase):
     template_name = 'submission/status.html'
 
@@ -120,8 +182,10 @@ class SubmissionStatus(SubmissionDetailBase):
         context['last_msg'] = event.last()
         context['batches'] = group_test_cases(submission.test_cases.all())
         context['time_limit'] = submission.problem.time_limit
+        context['cases_data'] = get_problem_data(submission)
         try:
-            lang_limit = submission.problem.language_limits.get(language=submission.language)
+            lang_limit = submission.problem.language_limits.get(
+                language=submission.language)
         except ObjectDoesNotExist:
             pass
         else:
@@ -135,7 +199,8 @@ class SubmissionTestCaseQuery(SubmissionStatus):
     def get(self, request, *args, **kwargs):
         if 'id' not in request.GET or not request.GET['id'].isdigit():
             return HttpResponseBadRequest()
-        self.kwargs[self.pk_url_kwarg] = kwargs[self.pk_url_kwarg] = int(request.GET['id'])
+        self.kwargs[self.pk_url_kwarg] = kwargs[self.pk_url_kwarg] = int(
+            request.GET['id'])
         return super(SubmissionTestCaseQuery, self).get(request, *args, **kwargs)
 
 
@@ -195,19 +260,24 @@ class SubmissionsListBase(DiggPaginatorMixin, TitleMixin, ListView):
                                                           queryset=ProblemTranslation.objects.filter(
                                                               language=self.request.LANGUAGE_CODE), to_attr='_trans'))
         if self.in_contest:
-            queryset = queryset.filter(contest__participation__contest_id=self.contest.id)
+            queryset = queryset.filter(
+                contest__participation__contest_id=self.contest.id)
             if self.contest.hide_scoreboard and self.contest.is_in_contest(self.request.user):
-                queryset = queryset.filter(contest__participation__user=self.request.profile)
+                queryset = queryset.filter(
+                    contest__participation__user=self.request.profile)
         else:
-            queryset = queryset.select_related('contest_object').defer('contest_object__description')
+            queryset = queryset.select_related(
+                'contest_object').defer('contest_object__description')
 
             # This is not technically correct since contest organizers *should* see these, but
             # the join would be far too messy
             if not self.request.user.has_perm('judge.see_private_contest'):
-                queryset = queryset.exclude(contest_object_id__in=Contest.objects.filter(hide_scoreboard=True))
+                queryset = queryset.exclude(
+                    contest_object_id__in=Contest.objects.filter(hide_scoreboard=True))
 
         if self.selected_languages:
-            queryset = queryset.filter(language_id__in=Language.objects.filter(key__in=self.selected_languages))
+            queryset = queryset.filter(
+                language_id__in=Language.objects.filter(key__in=self.selected_languages))
         if self.selected_statuses:
             queryset = queryset.filter(result__in=self.selected_statuses)
 
@@ -221,7 +291,8 @@ class SubmissionsListBase(DiggPaginatorMixin, TitleMixin, ListView):
             if not self.request.user.has_perm('judge.see_organization_problem'):
                 filter = Q(problem__is_organization_private=False)
                 if self.request.user.is_authenticated:
-                    filter |= Q(problem__organizations__in=self.request.profile.organizations.all())
+                    filter |= Q(
+                        problem__organizations__in=self.request.profile.organizations.all())
                 queryset = queryset.filter(filter)
         return queryset
 
@@ -242,20 +313,26 @@ class SubmissionsListBase(DiggPaginatorMixin, TitleMixin, ListView):
         authenticated = self.request.user.is_authenticated
         context['dynamic_update'] = False
         context['show_problem'] = self.show_problem
-        context['completed_problem_ids'] = user_completed_ids(self.request.profile) if authenticated else []
-        context['authored_problem_ids'] = user_authored_ids(self.request.profile) if authenticated else []
-        context['editable_problem_ids'] = user_editable_ids(self.request.profile) if authenticated else []
+        context['completed_problem_ids'] = user_completed_ids(
+            self.request.profile) if authenticated else []
+        context['authored_problem_ids'] = user_authored_ids(
+            self.request.profile) if authenticated else []
+        context['editable_problem_ids'] = user_editable_ids(
+            self.request.profile) if authenticated else []
 
-        context['all_languages'] = Language.objects.all().values_list('key', 'name')
+        context['all_languages'] = Language.objects.all(
+        ).values_list('key', 'name')
         context['selected_languages'] = self.selected_languages
 
         context['all_statuses'] = self.get_searchable_status_codes()
         context['selected_statuses'] = self.selected_statuses
 
         context['results_json'] = mark_safe(json.dumps(self.get_result_data()))
-        context['results_colors_json'] = mark_safe(json.dumps(settings.DMOJ_STATS_SUBMISSION_RESULT_COLORS))
+        context['results_colors_json'] = mark_safe(
+            json.dumps(settings.DMOJ_STATS_SUBMISSION_RESULT_COLORS))
 
-        context['page_suffix'] = suffix = ('?' + self.request.GET.urlencode()) if self.request.GET else ''
+        context['page_suffix'] = suffix = (
+            '?' + self.request.GET.urlencode()) if self.request.GET else ''
         context['first_page_href'] = (self.first_page_href or '.') + suffix
         context['my_submissions_link'] = self.get_my_submissions_page()
         context['all_submissions_link'] = self.get_all_submissions_page()
@@ -280,14 +357,16 @@ class UserMixin(object):
     def get(self, request, *args, **kwargs):
         if 'user' not in kwargs:
             raise ImproperlyConfigured('Must pass a user')
-        self.profile = get_object_or_404(Profile, user__username=kwargs['user'])
+        self.profile = get_object_or_404(
+            Profile, user__username=kwargs['user'])
         self.username = kwargs['user']
         return super(UserMixin, self).get(request, *args, **kwargs)
 
 
 class ConditionalUserTabMixin(object):
     def get_context_data(self, **kwargs):
-        context = super(ConditionalUserTabMixin, self).get_context_data(**kwargs)
+        context = super(ConditionalUserTabMixin,
+                        self).get_context_data(**kwargs)
         if self.request.user.is_authenticated and self.request.profile == self.profile:
             context['tab'] = 'my_submissions_tab'
         else:
@@ -355,19 +434,22 @@ class ProblemSubmissionsBase(SubmissionsListBase):
         if 'problem' not in kwargs:
             raise ImproperlyConfigured(_('Must pass a problem'))
         self.problem = get_object_or_404(Problem, code=kwargs['problem'])
-        self.problem_name = self.problem.translated_name(self.request.LANGUAGE_CODE)
+        self.problem_name = self.problem.translated_name(
+            self.request.LANGUAGE_CODE)
         return super(ProblemSubmissionsBase, self).get(request, *args, **kwargs)
 
     def get_all_submissions_page(self):
         return reverse('chronological_submissions', kwargs={'problem': self.problem.code})
 
     def get_context_data(self, **kwargs):
-        context = super(ProblemSubmissionsBase, self).get_context_data(**kwargs)
+        context = super(ProblemSubmissionsBase,
+                        self).get_context_data(**kwargs)
         if self.dynamic_update:
             context['dynamic_update'] = context['page_obj'].number == 1
             context['dynamic_problem_id'] = self.problem.id
             context['last_msg'] = event.last()
-        context['best_submissions_link'] = reverse('ranked_submissions', kwargs={'problem': self.problem.code})
+        context['best_submissions_link'] = reverse('ranked_submissions', kwargs={
+                                                   'problem': self.problem.code})
         return context
 
 
@@ -402,14 +484,17 @@ class UserProblemSubmissions(ConditionalUserTabMixin, UserMixin, ProblemSubmissi
     def get_content_title(self):
         if self.request.user.is_authenticated and self.request.profile == self.profile:
             return format_html('''My submissions for <a href="{3}">{2}</a>''',
-                               self.username, reverse('user_page', args=[self.username]),
+                               self.username, reverse(
+                                   'user_page', args=[self.username]),
                                self.problem_name, reverse('problem_detail', args=[self.problem.code]))
         return format_html('''<a href="{1}">{0}</a>'s submissions for <a href="{3}">{2}</a>''',
-                           self.username, reverse('user_page', args=[self.username]),
+                           self.username, reverse(
+                               'user_page', args=[self.username]),
                            self.problem_name, reverse('problem_detail', args=[self.problem.code]))
 
     def get_context_data(self, **kwargs):
-        context = super(UserProblemSubmissions, self).get_context_data(**kwargs)
+        context = super(UserProblemSubmissions,
+                        self).get_context_data(**kwargs)
         context['dynamic_user_id'] = self.profile.id
         return context
 
@@ -417,7 +502,8 @@ class UserProblemSubmissions(ConditionalUserTabMixin, UserMixin, ProblemSubmissi
 def single_submission(request, submission_id, show_problem=True):
     request.no_profile_update = True
     authenticated = request.user.is_authenticated
-    submission = get_object_or_404(submission_related(Submission.objects.all()), id=int(submission_id))
+    submission = get_object_or_404(submission_related(
+        Submission.objects.all()), id=int(submission_id))
 
     if not submission.problem.is_accessible_by(request.user):
         raise Http404()
@@ -515,11 +601,14 @@ class UserContestSubmissions(ForceContestMixin, UserProblemSubmissions):
         if self.problem.is_accessible_by(self.request.user):
             return format_html(_('<a href="{1}">{0}</a>\'s submissions for '
                                  '<a href="{3}">{2}</a> in <a href="{5}">{4}</a>'),
-                               self.username, reverse('user_page', args=[self.username]),
-                               self.problem_name, reverse('problem_detail', args=[self.problem.code]),
+                               self.username, reverse(
+                                   'user_page', args=[self.username]),
+                               self.problem_name, reverse(
+                                   'problem_detail', args=[self.problem.code]),
                                self.contest.name, reverse('contest_view', args=[self.contest.key]))
         return format_html(_('<a href="{1}">{0}</a>\'s submissions for '
                              'problem {2} in <a href="{4}">{3}</a>'),
-                           self.username, reverse('user_page', args=[self.username]),
+                           self.username, reverse(
+                               'user_page', args=[self.username]),
                            self.get_problem_number(self.problem),
                            self.contest.name, reverse('contest_view', args=[self.contest.key]))
diff --git a/judge/widgets/pagedown.py b/judge/widgets/pagedown.py
index d8d4de9..0968107 100644
--- a/judge/widgets/pagedown.py
+++ b/judge/widgets/pagedown.py
@@ -31,7 +31,6 @@ else:
             kwargs.setdefault('css', ('pagedown_widget.css',))
             super(PagedownWidget, self).__init__(*args, **kwargs)
 
-
     class AdminPagedownWidget(PagedownWidget, admin_widgets.AdminTextareaWidget):
         class Media:
             css = {'all': [
@@ -40,7 +39,6 @@ else:
             ]}
             js = ['admin/js/pagedown.js']
 
-
     class MathJaxPagedownWidget(PagedownWidget):
         class Media:
             js = [
@@ -49,11 +47,9 @@ else:
                 'pagedown_math.js',
             ]
 
-
     class MathJaxAdminPagedownWidget(AdminPagedownWidget, MathJaxPagedownWidget):
         pass
 
-
     class HeavyPreviewPageDownWidget(PagedownWidget):
         def __init__(self, *args, **kwargs):
             kwargs.setdefault('template', 'pagedown.html')
@@ -86,7 +82,6 @@ else:
             css = {'all': ['dmmd-preview.css']}
             js = ['dmmd-preview.js']
 
-
     class HeavyPreviewAdminPageDownWidget(AdminPagedownWidget, HeavyPreviewPageDownWidget):
         class Media:
             css = {'all': [
diff --git a/requirements.txt b/requirements.txt
index 7df0c72..564fa30 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,3 +30,7 @@ packaging
 celery
 -e git://github.com/DMOJ/ansi2html.git#egg=ansi2html
 sqlparse
+channels
+channels-redis
+docker
+
diff --git a/resources/libs b/resources/libs
new file mode 160000
index 0000000..2681309
--- /dev/null
+++ b/resources/libs
@@ -0,0 +1 @@
+Subproject commit 2681309a5ddd3482e699761488c75d9a62a626ec
diff --git a/resources/pagedown b/resources/pagedown
new file mode 160000
index 0000000..fce395c
--- /dev/null
+++ b/resources/pagedown
@@ -0,0 +1 @@
+Subproject commit fce395c1e71920e065dbde3e184ffb61ef86996c
diff --git a/templates/about/about.html b/templates/about/about.html
new file mode 100644
index 0000000..70b97b9
--- /dev/null
+++ b/templates/about/about.html
@@ -0,0 +1,7 @@
+{% extends "base.html" %}
+
+{% block body %}
+    <p style="font-size:40px;">
+        I am <b><a href="https://codeforces.com/profile/cuom1999" style="color:red;" target="_blank">cuom1999</a></b>.
+    </p>
+{% endblock %}
\ No newline at end of file
diff --git a/templates/about/custom-checker-sample.html b/templates/about/custom-checker-sample.html
new file mode 100644
index 0000000..a2a74da
--- /dev/null
+++ b/templates/about/custom-checker-sample.html
@@ -0,0 +1,1106 @@
+{% extends "base.html" %}
+
+{% block body %}
+    <!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><style>body {
+  max-width: 980px;
+  border: 1px solid #ddd;
+  outline: 1300px solid #fff;
+  margin: 16px auto;
+}
+
+body .markdown-body
+{
+  padding: 45px;
+}
+
+@font-face {
+  font-family: fontawesome-mini;
+  src: url(data:font/woff;charset=utf-8;base64,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) format('woff');
+}
+
+.markdown-body {
+  font-family: sans-serif;
+  -ms-text-size-adjust: 100%;
+  -webkit-text-size-adjust: 100%;
+  color: #333333;
+  overflow: hidden;
+  font-family: "Helvetica Neue", Helvetica, "Segoe UI", Arial, freesans, sans-serif;
+  font-size: 16px;
+  line-height: 1.6;
+  word-wrap: break-word;
+}
+
+.markdown-body a {
+  background: transparent;
+}
+
+.markdown-body a:active,
+.markdown-body a:hover {
+  outline: 0;
+}
+
+.markdown-body b,
+.markdown-body strong {
+  font-weight: bold;
+}
+
+.markdown-body mark {
+  background: #ff0;
+  color: #000;
+  font-style: italic;
+  font-weight: bold;
+}
+
+.markdown-body sub,
+.markdown-body sup {
+  font-size: 75%;
+  line-height: 0;
+  position: relative;
+  vertical-align: baseline;
+}
+.markdown-body sup {
+  top: -0.5em;
+}
+.markdown-body sub {
+  bottom: -0.25em;
+}
+
+.markdown-body h1 {
+  font-size: 2em;
+  margin: 0.67em 0;
+}
+
+.markdown-body img {
+  border: 0;
+}
+
+.markdown-body hr {
+  -moz-box-sizing: content-box;
+  box-sizing: content-box;
+  height: 0;
+}
+
+.markdown-body pre {
+  overflow: auto;
+}
+
+.markdown-body code,
+.markdown-body kbd,
+.markdown-body pre,
+.markdown-body samp {
+  font-family: monospace, monospace;
+  font-size: 1em;
+}
+
+.markdown-body input {
+  color: inherit;
+  font: inherit;
+  margin: 0;
+}
+
+.markdown-body html input[disabled] {
+  cursor: default;
+}
+
+.markdown-body input {
+  line-height: normal;
+}
+
+.markdown-body input[type="checkbox"] {
+  box-sizing: border-box;
+  padding: 0;
+}
+
+.markdown-body table {
+  border-collapse: collapse;
+  border-spacing: 0;
+}
+
+.markdown-body td,
+.markdown-body th {
+  padding: 0;
+}
+
+.markdown-body .codehilitetable {
+  border: 0;
+  border-spacing: 0;
+}
+
+.markdown-body .codehilitetable tr {
+  border: 0;
+}
+
+.markdown-body .codehilitetable pre,
+.markdown-body .codehilitetable div.codehilite {
+  margin: 0;
+}
+
+.markdown-body .linenos,
+.markdown-body .code,
+.markdown-body .codehilitetable td {
+  border: 0;
+  padding: 0;
+}
+
+.markdown-body td:not(.linenos) .linenodiv {
+  padding: 0 !important;
+}
+
+.markdown-body .code {
+  width: 100%;
+}
+
+.markdown-body .linenos div pre,
+.markdown-body .linenodiv pre,
+.markdown-body .linenodiv {
+  border: 0;
+  -webkit-border-radius: 0;
+  -moz-border-radius: 0;
+  border-radius: 0;
+  -webkit-border-top-left-radius: 3px;
+  -webkit-border-bottom-left-radius: 3px;
+  -moz-border-radius-topleft: 3px;
+  -moz-border-radius-bottomleft: 3px;
+  border-top-left-radius: 3px;
+  border-bottom-left-radius: 3px;
+}
+
+.markdown-body .code div pre,
+.markdown-body .code div {
+  border: 0;
+  -webkit-border-radius: 0;
+  -moz-border-radius: 0;
+  border-radius: 0;
+  -webkit-border-top-right-radius: 3px;
+  -webkit-border-bottom-right-radius: 3px;
+  -moz-border-radius-topright: 3px;
+  -moz-border-radius-bottomright: 3px;
+  border-top-right-radius: 3px;
+  border-bottom-right-radius: 3px;
+}
+
+.markdown-body * {
+  -moz-box-sizing: border-box;
+  box-sizing: border-box;
+}
+
+.markdown-body input {
+  font: 13px Helvetica, arial, freesans, clean, sans-serif, "Segoe UI Emoji", "Segoe UI Symbol";
+  line-height: 1.4;
+}
+
+.markdown-body a {
+  color: #4183c4;
+  text-decoration: none;
+}
+
+.markdown-body a:hover,
+.markdown-body a:focus,
+.markdown-body a:active {
+  text-decoration: underline;
+}
+
+.markdown-body hr {
+  height: 0;
+  margin: 15px 0;
+  overflow: hidden;
+  background: transparent;
+  border: 0;
+  border-bottom: 1px solid #ddd;
+}
+
+.markdown-body hr:before,
+.markdown-body hr:after {
+  display: table;
+  content: " ";
+}
+
+.markdown-body hr:after {
+  clear: both;
+}
+
+.markdown-body h1,
+.markdown-body h2,
+.markdown-body h3,
+.markdown-body h4,
+.markdown-body h5,
+.markdown-body h6 {
+  margin-top: 15px;
+  margin-bottom: 15px;
+  line-height: 1.1;
+}
+
+.markdown-body h1 {
+  font-size: 30px;
+}
+
+.markdown-body h2 {
+  font-size: 21px;
+}
+
+.markdown-body h3 {
+  font-size: 16px;
+}
+
+.markdown-body h4 {
+  font-size: 14px;
+}
+
+.markdown-body h5 {
+  font-size: 12px;
+}
+
+.markdown-body h6 {
+  font-size: 11px;
+}
+
+.markdown-body blockquote {
+  margin: 0;
+}
+
+.markdown-body ul,
+.markdown-body ol {
+  padding: 0;
+  margin-top: 0;
+  margin-bottom: 0;
+}
+
+.markdown-body ol ol,
+.markdown-body ul ol {
+  list-style-type: lower-roman;
+}
+
+.markdown-body ul ul ol,
+.markdown-body ul ol ol,
+.markdown-body ol ul ol,
+.markdown-body ol ol ol {
+  list-style-type: lower-alpha;
+}
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+</style><title>custom</title></head><body><article class="markdown-body"><h2 id="original-document"><a href="https://docs.dmoj.ca/#/problem_format/custom_checkers">Original Document</a><a class="headerlink" href="#original-document" title="Permanent link"></a></h2>
+<p>A <code>checker</code> Python script must implement a function that is called by the judge:</p>
+<div class="codehilite"><pre><span class="k">def</span> <span class="nf">check</span><span class="p">(</span><span class="n">process_output</span><span class="p">,</span> <span class="n">judge_output</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
+    <span class="c1"># return True/False</span>
+</pre></div>
+
+<p>Variables in global scope will exist throughout the grading process.</p>
+<p><code>**kwargs</code> is a directory containing</p>
+<ul>
+<li><code>submission_source</code>: the source code of the submission</li>
+<li><code>judge_input</code>: the judge&rsquo;s input</li>
+<li><code>point_value</code>: the point value of the test case</li>
+<li><code>case_position</code>: the index of the test case</li>
+<li><code>batch</code>: the batched the test case belongs to</li>
+<li><code>submission_language</code>: the language the submission was submitted in</li>
+<li><code>binary_data</code>: a boolean, which is <code>True</code> if the data was not normalized to Linux line endings, and <code>False</code> otherwise</li>
+<li><code>execution_time</code>: the runtime of the program, in seconds</li>
+</ul>
+<p>Additionally, if the <code>check</code> method has the flag <code>run_on_error</code> set, it will be run against the submission&rsquo;s output, even if it receives an IR/TLE/RTE/MLE verdict.
+The only built-in checker that has this flag set is the <code>linecount</code> checker.</p>
+<h2 id="return">Return:<a class="headerlink" href="#return" title="Permanent link"></a></h2>
+<p><code>True</code> for correct output, <code>False</code> for incorrect one</p>
+<h2 id="sample-checker">Sample Checker:<a class="headerlink" href="#sample-checker" title="Permanent link"></a></h2>
+<p>Here is the checker for the problem: Print 2 integers having sum equal to n (n is read from input).</p>
+<div class="codehilite"><pre><span class="k">def</span> <span class="nf">check</span><span class="p">(</span><span class="n">process_output</span><span class="p">,</span> <span class="n">judge_output</span><span class="p">,</span> <span class="n">judge_input</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
+    <span class="c1"># process the input</span>
+    <span class="n">input_arr</span> <span class="o">=</span> <span class="n">judge_input</span><span class="o">.</span><span class="n">split</span><span class="p">()</span>
+    <span class="k">assert</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">input_arr</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">)</span>
+    <span class="n">n</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">input_arr</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span>
+
+    <span class="c1">#  process the contestant&#39;s output</span>
+    <span class="n">output_arr</span> <span class="o">=</span> <span class="n">process_output</span><span class="o">.</span><span class="n">split</span><span class="p">()</span>
+
+    <span class="k">if</span> <span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">output_arr</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">2</span><span class="p">):</span>
+        <span class="k">return</span> <span class="bp">False</span>
+
+    <span class="k">try</span><span class="p">:</span>
+        <span class="n">a</span><span class="p">,</span> <span class="n">b</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">output_arr</span><span class="p">[</span><span class="mi">0</span><span class="p">]),</span> <span class="nb">int</span><span class="p">(</span><span class="n">output_arr</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span>
+    <span class="k">except</span><span class="p">:</span>
+        <span class="k">return</span> <span class="bp">False</span>
+
+    <span class="k">if</span> <span class="p">(</span><span class="n">n</span> <span class="o">==</span> <span class="n">a</span> <span class="o">+</span> <span class="n">b</span><span class="p">):</span>
+        <span class="k">return</span> <span class="bp">True</span>
+    <span class="k">return</span> <span class="bp">False</span>
+</pre></div></article></body></html>
+{% endblock body %}
\ No newline at end of file
diff --git a/templates/blog/list.html b/templates/blog/list.html
index c5976d0..a28c442 100644
--- a/templates/blog/list.html
+++ b/templates/blog/list.html
@@ -266,3 +266,11 @@
     </div>
     {% block after_posts %}{% endblock %}
 {% endblock %}
+
+{% block bodyend %}
+    {{ super() }}
+    {% if REQUIRE_JAX %}
+        {% include "mathjax-load.html" %}
+    {% endif %}
+    {% include "comments/math.html" %}
+{% endblock %}
diff --git a/templates/chat/chat.html b/templates/chat/chat.html
new file mode 100644
index 0000000..7b1eb9a
--- /dev/null
+++ b/templates/chat/chat.html
@@ -0,0 +1,40 @@
+{% extends "base.html" %}
+
+{% block js_media %}
+<script type="text/javascript">
+    var chatSocket = new WebSocket(
+        'ws://' + window.location.host +
+        '/ws/chat/');
+</script>
+<script type="text/javascript">
+    $(function() {
+        chatSocket.onmessage = function(e) {
+            var data = JSON.parse(e.data);
+            var message = data['message'];
+            $('#chat-log').append(message + '\n');
+        };
+        chatSocket.onclose = function(e) {
+            console.error('Chat socket closed unexpectedly');
+        };
+        $('#chat-message-input').focus();
+        $('#chat-message-input').keyup(function(e) {
+            if (e.keyCode === 13) {  // enter, return
+                $('#chat-message-submit').click();
+            }
+        });
+        $("#chat-message-submit").click(function() {
+            var message = "{{ request.user }}: " + $('input#chat-message-input').val();
+            chatSocket.send(JSON.stringify({
+                'message': message,
+            }));
+            $('input#chat-message-input').val('');
+        });
+    });
+</script>
+{% endblock js_media %}
+
+{% block body %}
+    <textarea id="chat-log" cols="100" rows="20"></textarea><br/>
+    <input id="chat-message-input" type="text" size="100"/><br/>
+    <button id="chat-message-submit"> Send </button>
+{% endblock body %}
diff --git a/templates/problem/data.html b/templates/problem/data.html
index 83d16ed..389ec64 100644
--- a/templates/problem/data.html
+++ b/templates/problem/data.html
@@ -26,7 +26,7 @@
 
             var $table = $('#case-table');
             $table.on('add-row', function (e, $tr) {
-                update_select2();
+                // update_select2();
                 $tr.find('input').filter('[id$=file]').each(function () {
                     var $select, val = $(this).replaceWith($select = $('<select>').attr({
                         id: $(this).attr('id'),
@@ -95,6 +95,22 @@
                 }).change();
             }
 
+            function checker_custom($checker, $custom_checker) {
+                $tr = $custom_checker.parent().parent();
+                $td = $checker.parent();
+                var $sample = $("<a/>",{
+                    text: "Sample Checker",
+                    style: "margin-left:3em;",
+                    target: "_blank",
+                    href: "{{url('custom_checker_sample')}}"
+                }).appendTo($td);
+
+                $checker.change(function () {
+                    $tr.toggle($checker.val().startsWith('custom')).change();
+                    $sample.toggle($checker.val().startsWith('custom')).change();
+                }).change();
+            }
+
             function swap_row($a, $b) {
                 var $a_order = $a.find('input[id$=order]'), $b_order = $b.find('input[id$=order]');
                 var order = $a_order.val();
@@ -107,6 +123,7 @@
             }
 
             checker_precision($('#id_problem-data-checker'));
+            checker_custom($('#id_problem-data-checker'), $('#id_problem-data-custom_checker'));
 
             $table.on('add-row', function (e, $tr) {
                 var $order = $tr.find('input').filter('[id$=order]').attr('type', 'hidden').val(++order);
@@ -205,6 +222,47 @@
                 return false;
             });
 
+            $('a#fill-testcases').click(function () {
+                var inFiles = [], outFiles = [];
+                for (var i = 0; i < window.valid_files.length; i++) {
+                    if (window.valid_files[i].endsWith(".in")) {
+                        inFiles.push(window.valid_files[i]);
+                    }
+                    if (window.valid_files[i].endsWith(".out")) {
+                        outFiles.push(window.valid_files[i]);
+                    }
+                }
+                if (inFiles.length == 0) {
+                    alert("No input/output files. Make sure your files' suffices are .in/.out");
+                    return false;
+                }
+                if (inFiles.length != outFiles.length) {
+                    alert("The input files do not match the output files!");
+                    return false;
+                }
+                // add boxes
+                while ($total.val() < inFiles.length) {
+                    $('a#add-case-row').click();
+                }
+                // fill cases
+                for (var i = 0; i < inFiles.length; i++) {
+                    $("#id_cases-" + i + "-input_file").val(inFiles[i]).change();
+                }
+                // add points
+                if ($('#problem-type').val() == "ICPC") {
+                    for (i = 0; i + 1 < inFiles.length; i++) {
+                        $("#id_cases-" + i + "-points").val("0").change();
+                    }
+                    $("#id_cases-" + (inFiles.length - 1) + "-points").val("100").change();
+                }
+                else {
+                    for (i = 0; i < inFiles.length; i++) {
+                        $("#id_cases-" + i + "-points").val("1").change();
+                    }
+                }
+                return false;
+            });
+
             var oldIndex;
             $table.sortable({
                 containerSelector: 'table',
@@ -237,6 +295,15 @@
                 }
             });
 
+            $('input#delete-all').change(function() {
+                if (this.checked) {
+                    $("input[name$='DELETE']").attr('checked', true);
+                }
+                else {
+                    $("input[name$='DELETE']").attr('checked', false);
+                }
+            });
+
             var $controls = $('#column-visible');
             var problem = $controls.attr('data-problem');
             $controls.find('input').change(function () {
@@ -256,7 +323,7 @@
                 }
                 $this.prop('checked', filled).trigger('change');
             });
-        });
+        }).change();
     </script>
 {% endblock %}
 
@@ -324,7 +391,7 @@
             height: 8em;
         }
 
-        .generator-args-editor .button {
+        .generator-args-editor #submit-button {
             display: block;
             float: right;
         }
@@ -364,7 +431,23 @@
     <form action="" method="POST" enctype="multipart/form-data">
         {% csrf_token %}
         {{ cases_formset.management_form }}
-        <table class="table">{{ data_form.as_table() }}</table>
+        <table class="table">
+            {{ data_form.as_table() }}
+            <th>
+                <label>Autofill testcases:</label>
+            </th>
+            <td>
+                Problem type:
+                <select id="problem-type">
+                    <option value="ICPC">ICPC</option>
+                    <option value="OI">OI</option>
+                </select>
+                <a id="fill-testcases" href="#">
+                    <i class="fa fa-circle"></i>
+                    Fill testcases
+                </a>
+            </td>
+        </table>
         <div id="column-visible" data-problem="{{ problem.code }}">
             <strong>{{ _('Show columns:') }}</strong>
             <label>
@@ -383,6 +466,10 @@
                 <input type="checkbox" data-suffix="generator_args">
                 {{ _('Generator args') }}
             </label>
+            <label>
+                <input type="checkbox" id="delete-all">
+                {{ _('Delete all') }}
+            </label>
         </div>
         <table id="case-table" class="table">
             <thead>
@@ -398,7 +485,8 @@
                 <th class="checker">{{ _('Checker') }}</th>
                 <th class="generator-args">{{ _('Generator args') }}</th>
                 {% if cases_formset.can_delete %}
-                    <th>{{ _('Delete?') }}</th>
+                    <th>{{ _('Delete?') }} 
+                    </th>
                 {% endif %}
             </tr>
             </thead>
@@ -444,7 +532,7 @@
             {% endfor %}
             </tbody>
         </table>
-        <input type="submit" value="{{ _('Submit!') }}" class="button">
+        <input type="submit" value="{{ _('Submit!') }}" class="button" id="submit-button">
         <a id="add-case-row" href="#"><i class="fa fa-plus"></i> {{ _('Add new case') }}</a>
     </form>
     <div style="display: none" class="generator-args-editor"><textarea></textarea><a class="button">Save</a></div>
diff --git a/templates/submission/status-testcases.html b/templates/submission/status-testcases.html
index 2c5740b..b9d9520 100644
--- a/templates/submission/status-testcases.html
+++ b/templates/submission/status-testcases.html
@@ -36,7 +36,7 @@
         <table>{% for case in batch.cases %}
             <tr id="{{ case.id }}" class="case-row toggle closed">
                 <td>
-                    {%- if case.status != 'AC' and case.output and (prefix_length is none or prefix_length > 0) -%}
+                    {%- if ((prefix_length is none or prefix_length > 0) or (request.user.is_superuser)) -%}
                         <i class="fa fa-chevron-right fa-fw"></i>
                     {%- endif -%}
                     {%- if batch.id -%}
@@ -72,16 +72,17 @@
                 {% endif %}
             </tr>
 
-            {% if case.status != 'AC' and case.output and (prefix_length is none or prefix_length > 0) %}
+            {% if ((prefix_length is none or prefix_length > 0) or (request.user.is_superuser)) %}
                 <tr id="{{ case.id }}-output" style="display:none" class="case-feedback toggled">
                     <td colspan="5">
                         <div class="case-info">
-                            <strong>{{ _('Your output (clipped)') }}</strong>
-                            {% if prefix_length is none %}
-                                <pre class="case-output">{{ case.output|linebreaksbr }}</pre>
-                            {% else %}
-                                <pre class="case-output">{{ case.output[:prefix_length]|linebreaksbr }}</pre>
-                            {% endif %}
+                            {% set curr_data = cases_data[case.case] %}
+                            <strong>{{ _('Input:') }}</strong>
+                            <pre class="case-output">{{ curr_data['input']|linebreaksbr }}</pre>
+                            <strong>{{ _('Your output:') }}</strong>
+                            <pre class="case-output">{{ case.output|linebreaksbr }}</pre>
+                            <strong>{{ _('Answer:') }}</strong>
+                            <pre class="case-output">{{ curr_data['answer']|linebreaksbr }}</pre>
                         </div>
                     </td>
                     {% if case.extended_feedback %}