Hello everyone!
We are excited to announce that the International Invitational Math Optimization Challenge (IIMOC) 2025 has officially begun!
IIMOC is a month-long algorithmic optimization contest featuring a single NP-hard optimization problem, designed for competitive programmers, university teams, and advanced high-schoolers. This year’s edition already includes signups from MIT, HKUST, top IITs, and dozens of other universities and national Olympiad teams.
Contest dates: November 22 – December 21, 2025
Signups remain open throughout the competition. You can register anytime at https://iimoc.org — the process is quick and requires no verification. We encourage new teams to join; most teams haven’t submitted yet, and losing a few days makes very little difference in an optimization-style contest.
We hope your heuristics converge faster than the submission deadline!
EDIT: Contest ends December 21, 9:00PM PST exactly.
Is the website down?
Sorry, I handled the leaderboard loading in a ridiculous way so too many people loading at the same time crashed the server, it should be up now. Thanks for the report.
trinh minh anh
This will be one amazing contest
Thanks lol
Auto comment: topic has been updated by iimoc (previous revision, new revision, compare).
Is the sample test part of the 30 pre-tests?
The sample test is not included in the pretests.
Why is the problem not visible ?
It works for me and other contestants, I believe that your school wifi is blocking the API call. What is the error you are getting?
It shows a "Could not load problem statement" message.
Thanks i can see it now using vpn.
In the console, using inspect element.
I am receiving a
500 Internal Server Errorwhen submitting a solution.issue has been resolved for me thanks