Contest

Tasks

IOI 2026 tasks are published under the Creative Commons Attribution license (CC-BY) license.

Practice Contest

The IOI 2026 practice tasks are available below:

aplusb — A + B Queries
- Statement: Official English
- Test data and supplementary material
bitstrings — Duplicated Binary Strings
- Statement: Official English
- Test data and supplementary material
boringgame — Boring Game
- Statement: Official English
- Test data and supplementary material
magic — Magic Trick
- Statement: Official English
- Test data and supplementary material