Just happened

IOI 2018 took place in Japan in September, 2018. More info is available on the official website.

Just happened   IOI 2018 in Japan

IOI 2005

The 17th International Olympiad in Informatics was held in Nowy Sacz, Poland in 2005. There were two competition days, with 3 tasks given to the competitors on each day. You can see the tasks, test cases and solutions below.

Day 1:
      Garden
      Mean Sequence
      Mountain

Day 2:
      Birthday
      Rectangle Game
      Rivers

Other materials:
      Test cases
      Solutions and booklet


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?

Beginners

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.

Statistics

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

Journal

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