Hi, everyone.
The first stage of the IOI 2026 China Team Selection has ended today. The top 48 participants from the 2025 National Olympiad in Informatics (NOI) will compete for a spot on the Chinese national team for IOI 2026.
The rule of selecting CHN team this year:
- Homework (10%). The participants are asked to choose 4 tasks for homework and complete 60 tasks of them.
- First stage (CTT; 54%; Dec 2, 2025 — Dec 4, 2025): three contests in classic olympiad format, where each contest worthes 18% of the score. Top 30 participants will advance to the final stage.
- Final stage (CTS; 36%; Feb 10, 2026 — Feb 12, 2026): two contests in classic olympiad format, where each contest worthes 18% of the score.
The current scoreboard can be found here. Tasks of the first round can be found here
UPD1: The Day1 contest of CTS have ended.
UPD2: The Day2 contest of CTS have ended. Kevin114514,fake_banana,Z-301,NKheyuxiang,flying,Flamire will enter the thesis defense stage.



