Due to the COVID-19 pandemic, IOI 2020 will be held online. More info is available on the official website.

Update   IOI 2020 will be held online

IOI 2000

The 12th International Olympiad in Informatics was held in Beijing, China in 2000. 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:
      Car Parking
      Median Strength

Day 2:
      Post Office
      Building with Blocks

Other materials:
      Test cases and some source codes
      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.

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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.