Croatian Open Competition in Informatics — COCI 2021/2022

Internet online contest series

As part of the COCI series, we are hosting an Internet online contest with problems from the Croatian Olympiad in Informatics 2022. The contest is primarily intended for high school contestants, but is open to all interested!

This contest is used in Croatia to select members of the IOI 2022 team. There will be three to five tasks and the contest will be five hours long. The contestants will have full feedback with at most 50 submissions per task.

It will be held on Sunday, May 29, starting at 15:00 (GMT/UTC).

Check out your local times at https://hsin.hr/coci/next_contest.html

You may use Python, Pascal, C, C++ or Java as your programming language of choice.

The two relevant websites are:

https://hsin.hr/coci/ — information about the contest

https://evaluator.hsin.hr/ — judging system

We hope that you will join us or encourage your students to do so!

Hi everyone!

The sixth round of COCI will be held tomorrow, April 9th at 14:00 UTC. You can access the judging system here. If you are not familiar with the COCI contest format, we encourage you to read the announcement.

The round was prepared by ominikfistric, Bartol, pavkal5, and me.

Feel free to discuss the problems in the comment section after the contest ends.

Hope to see you tomorrow!

Hi everyone!

The fifth round of COCI will be held tomorrow, March 5th at 14:00 UTC. You can access the judging system here. If you are not familiar with COCI contest format, we encourage you to read the announcement.

The round was prepared by ominikfistric, Bartol, pavkal5, and me.

Feel free to discuss the problems in the comment section after the contest ends.

Support for rust will be added either for the next round or for the next season.

Hope to see you tomorrow!

Hi everyone!

The fourth round of COCI will be held tomorrow, January 29th at 14:00 UTC. You can access the judging system here. If you are not familiar with COCI contest format, we encourage you to read the announcement.

The round was prepared by ominikfistric, Bartol, paula, pavkal5, and me.

Feel free to discuss the problems in the comment section after the contest ends.

Hope to see you tomorrow!

Hi everyone!

The third round of COCI will be held tomorrow, December 11th at 14:00 UTC. You can access the judging system here. If you are not familiar with COCI contest format, we encourage you to read the announcement.

The round was prepared by Bartol, pavkal5, ominikfistric, and me.

Feel free to discuss the problems in the comment section after the contest ends.

Hope to see you tomorrow!

Hi everyone!

The second round of COCI will be held tomorrow, November 13th at 14:00 UTC. You can access the judging system here. If you are not familiar with COCI contest format, we encourage you to read the announcement.

The round was prepared by Bartol, paula, pavkal5, ominikfistric, Shtef and me.

Feel free to discuss the problems in the comment section after the contest ends.

Hope to see you tomorrow!

Hi everyone!

The 16th season of COCI is starting soon! The first round will be held tomorrow, October 16th at 14:00 UTC. You can access the judging system here. If you are not familiar with the COCI contest format, we encourage you to read the announcement.

The round was prepared by pavkal5, paula, ominikfistric, Shtef and me.

Feel free to discuss the problems in the comment section after the contest ends.

Hope to see you tomorrow!