Hello Codeforces community,
We are excited to invite you to TOKI KSN Open Contest 2021 — an online mirror contest for the Indonesia national olympiad in informatics. This national olympiad is one of the stages required for our students to qualify to represent Indonesia in the International Olympiad in Informatics (IOI). You may have seen our past open olympiads (2015, 2016, 2017, 2018, 2019, 2020) and you can check our past problems here.
The contest is similar to IOI: 2 competition days (+ 1 trial session), each consisting of 3 IOI-style (partial, subtasks) problems to be solved in 5 hours. The schedule is as follows:
- Day 0: 7 November 2021 09:00 — 8 November 2021 01:30 UTC (trial session)
- Day 1: 8 November 2021 06:30 — 9 November 2021 01:30 UTC
- Day 2: 9 November 2021 06:30 — 10 November 2021 01:30 UTC
Each contestant can select any 5-hour window within the time range to do the contest for each competition day. Each contestant may start the contest any time within the time range, by clicking the "start" button. The scoreboard will be hidden until the contest has ended.
All three contests are now available on TLX.
For more detailed information and rules, see our official website.
See you on the leaderboard!
UPD The official contest has ended, thanks for your participation!
The result of the open contest can be found on our website.
You can upsolve the problems here.
The editorials can be found in the contest link or upsolve link.
If you'd like to give feedback to the KSN Open, you may submit a response in this form.
We thank everyone who are involved:
- Scientific Committee: prabowo, Yoshiyuki, AMnu, steven.novaryo, vioalbert
- Technical Committee: fushar, faishol27, Samuel
- Authors: fushar, prabowo, AMnu, steven.novaryo, Pyqe
- Testers: rama_pang, hocky, jfcjaya
We hope we can conduct the open OI again, and see you next year!
