The IOI 2025 tasks are published under the Creative Commons Attribution license (CC-BY) license.

Practice Contest

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