Coming soon

IOI 2023 will be hosted by Hungary. Visit the official website to learn more.

Coming soon   IOI 2023 in Hungary

IOI 2010

The 22nd International Olympiad in Informatics was held in Waterloo, Canada in 2010. There were two competition days, with 4 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below.

Day 1:
      Hotter Colder
      Quality of Living

Day 2:
      Save It

Other materials:
      Test cases
      Solutions to all problems

Note that the grading model changed at IOI'94 and beyond.
Before IOI 1994, a human evaluator would sit behind the competitor's computer and do the testing manually (enter test data through the keyboard, check the output on the screen). Starting from IOI 1994, an automatic grading process is used, with test input defined in files.

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.