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Due to the COVID-19 pandemic, IOI 2020 was hosted by Singapore online. Visit the official website to learn more.

Just finished   IOI 2020 was held online

IOI 2011

The 23rd International Olympiad in Informatics was held in Pattaya, Thailand in 2011. 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:
      Tropical Garden
      Race
      Ricehub

Day 2:
      Crocodile
      Elephants
      Parrots

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.

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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.