LQDOJ: Le Quy Don Online Judge

Overview

Homepage: https://lqdoj.edu.vn

Based on DMOJ.

Supported languages:

• Assembly (x64)
• AWK
• C
• C++03 / C++11 / C++14 / C++17
• Java 11
• Pascal
• Perl
• Python 2 / Python 3

Support plagiarism detection via Stanford MOSS.

Installation

Most of the setup are the same as DMOJ installations. You can view the installation guide of DMOJ here: https://docs.dmoj.ca/#/site/installation. There is one minor change: Instead of git clone https://github.com/DMOJ/site.git, you clone this repo git clone https://github.com/LQDJudge/online-judge.git.

Some frequent difficulties when installation:

1. Missing the local_settings.py. You need to copy the local_settings.py in order to pass the check.
2. Missing the problem folder in local_settings.py. You need to create a folder to contain all problem packages and configure in local_settings.py.
3. Missing static folder in local_settings.py. Similar to problem folder, make sure to configure STATIC_FILES inside local_settings.py.
4. Missing configure file for judges. Each judge must have a seperate configure file. To create this file, you can run python dmojauto-conf. Checkout all sample files here https://github.com/DMOJ/docs/blob/master/sample_files.
5. Missing timezone data for SQL. If you're using Ubuntu and you're following DMOJ's installation guide for the server, and you are getting the error mentioned in https://github.com/LQDJudge/online-judge/issues/45, then you can follow this method to fix:

mysql
-- You may have to do this if you haven't set root password for MySQL, replace mypass with your password
-- SET PASSWORD FOR 'root'@'localhost' = PASSWORD('mypass');
-- FLUSH PRIVILEGES;
exit
mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -D mysql -u root -p 
mysql -u root -p -e "flush tables;" mysql

6. Missing the chat secret key, you must generate a Fernet key, and assign a variable in local_settings.py like this

CHAT_SECRET_KEY = "81HqDtbqAywKSOumSxxxxxxxxxxxxxxxxx="

Usage

Suppose you finished all the installation. Everytime you want to run a local server, follow these steps:

1. Activate virtualenv:

source dmojsite/bin/activate

2. Run server:

python3 manage.py runserver 0.0.0.0:8000

3. Create a bridge (this is opened in a different terminal with the second step if you are using the same machine)

python3 manage.py runbridged

4. Create a judge (another terminal)

dmoj 0.0.0.0 -p 9999 -c <path to yml configure file>

Here we suppose you use the default port 9999 for bridge in settings.py. You can create multiple judges, each should be in a seperate terminal.

Optional

5. Run celery worker (This is server's queue. It may be necessary in some functions)

celery -A dmoj_celery worker

6. Run a live event server (So everything is updated lively like in the production)

node websocket/daemon.js

Deploy

Most of the steps are similar to Django tutorials. Here are two usual steps:

1. Update vietnamese translation:

• If you add any new phrases in the code, python3 manage.py makemessages
• go to locale/vi
• modify .po file
• python3 manage.py compilemessages
• python3 manage.py compilejsi18n

2. Update styles (using SASS)

• Change .css/.scss files in resources folder
• ./make_style.sh && python3 manage.py collectstatic
• Sometimes you need to Ctrl + F5 to see the new user interface in browser.

Screenshots

Leaderboard

Leaderboard with information about contest rating, performance points and real name of all users.

Admin dashboard

Admin dashboard helps you easily managing problems, users, contests and blog posts.

Statement editor

You can write the problems' statement in Markdown with LaTeX figures and formulas supported.

Chat

Users can communicate with each other and can see who's online.