| Problem Name | Online Judge | Contest | Difficulty Level | |
|---|---|---|---|---|
| 1 | KATHTHI | SPOJ | 2 | |
| 2 | Ocean Currents | UVA | 4 | |
| 3 | Three States | Codeforces | Codeforces Round #327 (Div. 1) & Codeforces Round #327 (Div. 2) | 5 |
| 4 | Olya and Energy Drinks | Codeforces | Codeforces Round #442 (Div. 2) | 5 |
| 5 | Chamber of Secrets | Codeforces | Croc Champ 2012 - Round 1 | 6 |
| 6 | Error | A2 Online Judge | 7 |