IOI 2023 was hosted by Hungary. Visit the official website to learn more.
Just finished IOI 2023 in Hungary
This is the official Syllabus for IOI 2023.
The most recent batch of small changes was published in March 2022 and presented during IOI 2022.
The Syllabus is an official document related to the IOI. For each IOI, an up-to-date version of the Syllabus is produced by the ISC, as described in the IOI Regulations, Statue 3.13.
The original proposal of the IOI Syllabus was co-authored by Tom Verhoeff, Gyula Horvath, Krzysztof Diks, and Gordon Cormack.
Since 2007, the following people have maintained the syllabus and made significant contributions: Michal Forisek, Jakub Lacki and Richard Peng.
More information on the history and evolution of the Syllabus is available here: https://people.ksp.sk/~misof/ioi-syllabus/
It might also be a good idea to look at problems from past Olympiads, which are available on the Editions page.