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