Codebreaker is the official platform for Singapore Informatics Olympiad training and contests. We have run selection for the International Olympiad in Informatics for the delegations of Singapore and Indonesia, as well as countless official national and school training programmes.
All problems
Recent submissions
Rankings
Countries of the World
Click here to start tour
| Problem | Users |
|---|---|
| japan2026 | 203 |
| evilbz | 201 |
| addition | 184 |
| cpicsort | 177 |
| urarareader | 174 |
| Problem | Submissions |
|---|---|
| evilbz | 939 |
| cpicgame | 756 |
| exam | 689 |
| addition | 633 |
| urarareader | 618 |