IOI 2023 was hosted by Hungary. Visit the official website to learn more.
Just finished IOI 2023 in Hungary
The 33rd International Olympiad in Informatics was held online in June 2021. 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 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.