Real OI scoring
Subtask-based partial scoring instead of plain AC counts. Strategy, partials, and full solutions all show up in your score.
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OI Community Online JudgeHome of the largest OI'er community
Home of the largest OI'er community
on the planet.
DOJ is an online judge built for olympiad-in-informatics students. Subtask scoring, regular rated rounds, a public ladder, and verified profiles all live in one place.
Live pulse
No round is running or imminent.
The next schedule will be announced in notices.
Platform pulse
What's happening on DOJ right now
22
Public problems
7
Certified users
134
Total submissions
37%
Accepted rate
Why DOJ
More than a judge.
OI-style training, rated rounds, and a public record — connected end to end.
Regular rated rounds
We run our own contests on a recurring schedule with ELO-based rating updates. Practice and competition stay on the same track.
A community you can trust
Discord verification keeps the public ladder real. Your handle, tier, and solve history become your profile.
Top of the ladder
See full ranking →Currently leading the pack
Public rating ladder, updated every time a rated round ends.
- 01A@auroraCandidate Master0Solved
- 02B@binaryfoxExpert0Solved
- 03C@celloSpecialist0Solved
- 04D@dadasPupil17Solved
- 05P@pkPupil2Solved
Latest noticePinnedGENERAL
Welcome to the Spring Season
The invite-only OI community judge is now live. Please complete Discord certification to appear on public rankings.
Apr 21, 2026, 5:05 PM
Join the community
Put your handle on the ladder.
Sign up, finish Discord verification, then enter rated rounds and earn a spot on the public ranking.