Postponed

Due to the COVID-19 pandemic, IOI 2020 has been postponed. More info is available on the official website.

Update   IOI 2020 is postponed

IOI 2017

The 29th International Olympiad in Informatics was held in Tehran, Iran in 2017. 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:
      Nowruz
      Wiring
      Toy Train

Day 2:
      The Big Prize
      Simurgh
      Ancient Books

Other materials:
      Test cases
      Solutions to all problems
      Practice 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?

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.