Privacy Policy

Last updated: June 2026

What we store

When you sign in with an OAuth provider (GitHub or Google) we receive and store your name, e-mail and avatar. We store the solutions you submit, their results and quality scores, so we can show your history and progress.

Cookies

We only use the session cookies required to keep you signed in (NextAuth). There are no advertising or third-party tracking cookies.

Code execution

The C++ code you submit is compiled and run on our infrastructure; if it is unavailable, it may be sent to the public Wandbox compilation service. Do not include personal data or secrets in your solutions.

Solution sharing

Your solutions are visible to other users only if you explicitly opted in when submitting. You can revoke sharing at any time.

Deleting your data

You can delete your account and all associated data (solutions, sessions, OAuth links) at any time from the profile page, "Danger zone" section. Deletion is irreversible.

Sharing with third parties

We do not sell or share your data with third parties beyond what is described above (code execution) and what the law requires.