Over the next six months we will organize seven online contests as a warm-up for the 2021 season of high school programming competitions. Everyone is welcome to participate! Each contest will be three hours long and will feature five tasks. 

The contestants will also have full feedback with at most 50 submissions per task. The tasks will be of widely varying difficulty; we hope that many beginner or up-and-coming contestants will participate, as well as the more experienced ones.

The first contest will be held this Saturday, October 17, starting at 14:00 (GMT/UTC).
You may use Python, Pascal, C/C++ or Java as your programming language of choice.

The contest will also be featured on a newly-developed judging system. If your students wish to get a bit more familiar with the system, we have uploaded the last 14 COCI seasons for them to practice on. Most problems (except for the very easy ones) have English translations.

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!

This is the fifteenth year in a row that we are hosting the COCI series. You can find the tasks (statements, test data and solutions) from the previous years at https://hsin.hr/coci/. There are over 600 original tasks for students to practice on!

With regards,
Kresimir Malnar
Croatian Computer Science Association