CMO
22 problems here, rated 5.2 to 7.6 on our scale (AIME, harder to National Olympiad, round 2). 22 of them ask for a proof. Years covered: 2003–2024.
| # | Topic | Diff | Type | Year | |
|---|---|---|---|---|---|
| 1 | Geometry | 5.2 | proof | — | open |
| 2 | Algebra | 5.3 | proof | 2003 | open |
| 3 | Geometry | 5.5 | proof | 2003 | open |
| 4 | Number theory | 5.6 | proof | — | open |
| 5 | Geometry | 5.6 | proof | 2017 | open |
| 6 | Number theory | 5.7 | proof | 2003 | open |
| 7 | Geometry | 6.0 | proof | 2003 | open |
| 8 | Number theory | 6.1 | proof | — | open |
| 9 | Geometry | 6.3 | proof | 2003 | open |
| 10 | Combinatorics | 6.5 | proof | 2023 | open |
| 11 | Geometry | 6.6 | proof | 2017 | open |
| 12 | Combinatorics | 6.6 | proof | 2023 | open |
| 13 | Algebra | 6.6 | proof | 2023 | open |
| 14 | Combinatorics | 6.8 | proof | 2017 | open |
| 15 | Geometry | 6.8 | proof | 2024 | open |
| 16 | Geometry | 7.0 | proof | 2023 | open |
| 17 | Number theory | 7.2 | proof | 2024 | open |
| 18 | Geometry | 7.2 | proof | — | open |
| 19 | Combinatorics | 7.2 | proof | — | open |
| 20 | Algebra | 7.3 | proof | 2024 | open |
| 21 | Algebra | 7.5 | proof | 2024 | open |
| 22 | Combinatorics | 7.6 | proof | 2023 | open |
These are sorted by difficulty within the competition, but they aren't a course.
The track is the route through, drawn from all the sources at once.