Coming soon

IOI 2019 will take place in Azerbaijan, from August 4-11, 2019. More info is available on the official website.

Coming soon   IOI 2019 in Azerbaijan

Croatian Open Competition in Informatics

The fourth contest will be held on Saturday, 16th December 2017, starting at 14:00 (GMT/UTC). Check out your local times at

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

The two relevant websites are: - information about the contest - contest system


Need more info?


Not sure where to go? Click here to view some basic information on how to learn programming and prepare to win a medal at the IOI.


A couple of volunteers maintain a separate page with stats about people who participated at the International Olympiad in Informatics.


The IOI publishes a journal every year, with original high-quality scientific papers related to education, contests and algorithms.