| Problem Name | Online Judge | Contest | Difficulty Level | |
|---|---|---|---|---|
| 1 | Yet another Number Sequence | UVA | 2 | |
| 2 | Sum of products | SPOJ | 3 | |
| 3 | Plant | Codeforces | Codeforces Round #118 (Div. 1) & Codeforces Round #118 (Div. 2) | 3 |
| 4 | Blocks for kids | SPOJ | 5 | |
| 5 | Decoding Genome | Codeforces | Codeforces Round #137 (Div. 2) | 6 |