| Problem Name | Online Judge | Year | Contest | Difficulty Level | |
|---|---|---|---|---|---|
| 1 | Frequent values | SPOJ | 1 | ||
| 2 | Largest Rectangle in a Histogram | SPOJ | 1 | ||
| 3 | Query on a tree II | SPOJ | 1 | ||
| 4 | Frequent values | TJU | 2 | ||
| 5 | Binary Search Heap Construction | SPOJ | 3 | ||
| 6 | Imperial roads | Live Archive | 2017 | Latin America | 5 |