LCOJOnline judge

Documentation for students, problem setters, contest organizers and anyone self-hosting LCOJ.

Students

Submit solutions and read verdicts, take quizzes, and read past exams in the library.

Get started

Problem setters

Create problems, structure test data, write checkers, graders and generators, and author quizzes.

Write problems

Contest organizers

Pick the right contest format and download contest data.

Run contests

Site admins

Grant permissions to users and manage short links.

Administer

Operators

System architecture, installing with Docker, judge setup, backups and updates.

Self-host

Reference

Status codes, supported languages, management commands and the API.

Look it up

Support

If you have questions, open an issue on GitHub Issues.

Need help with installation? If you'd rather not set it up yourself, the LCOJ team will help you install it for free. Get in touch at behitek.com or luyencode.net/about/#lien-he.

Real problem examples are in the problem_examples folder.