As a part of the IOI 2026 China Team Selection, the IOI 2026 China Mutual Tests will be held on QOJ. The contest is in IOI format and opened for everyone.
- Round 1: Oct/18/2025 03:00 (Moscow time) registration link
- Round 2: Oct/25/2025 03:00 (Moscow time) registration link
- Round 3: Nov/08/2025 03:00 (Moscow time) registration link
- Round 4: Nov/15/2025 03:00 (Moscow time)
Statements will be provided in Chinese only. Each contest is 5 hours long with the IOI ruleset. In other words, you will receive feedback of your submissions, and you can get partial scores.
Q&A s
Q: What's the difficulty of the contest? Can I participate if my rating is 1500/2000/2500/3000/4000?
A: The contest is typically harder than most Domestic/Regional Olympiad. We recommend you to participate in the contest if you can find joys in Codeforces Div. 1 contest.
Q: Can I use pre-written code / Google / AI during the contest?
A: We do not have any rules for non-official contestants (i.e. if you are not a member of IOI 2026 finalists in China). However, we encourage you to follow the IOI rule (i.e. Language Document is the only available reference material).
Q: What is the purpose of such contests?
A: It is a part of the IOI 2026 China Team Selection. Contestants are asked to submit their tasks and host Mutual Tests ("集训队互测") to get bonus points. Previously, all the contests are hosted privately. You may find the tasks from previous years here.
Q: Are the contests a part of the Universal Cup? Or will they be used in future U-Cup contests?
A: No.
Auto comment: topic has been updated by Qingyu (previous revision, new revision, compare).
Kevin114514 will AK IOI 2026 TST!
I’d also like to know the difficulty order and the standings.
Reminder: Round 3 will start in about 10.5 hours later.
Orz !
Why bother posting on (international based) CF and encouraging people not to use AI when you only give statements in chinese? It takes like 10 minutes to machine-translate a problemset.