| Problem Name | Online Judge | Contest | Difficulty Level | |
|---|---|---|---|---|
| 1 | Dima and Lisa | Codeforces | Codeforces Round #324 (Div. 2) | 2 |
| 2 | Taxes | Codeforces | Codeforces Round #382 (Div. 2) & Codeforces Round #382 (Div. 1) | 2 |
| 3 | Troublemakers | UVA | 4 | |
| 4 | Interactive LowerBound | Codeforces | AIM Tech Round 4 (Div. 1) & AIM Tech Round 4 (Div. 2) | 5 |
| 5 | Ghd | Codeforces | Codeforces Round #213 (Div. 1) | 8 |
| 6 | Oranges and Apples | Codeforces | Codeforces Beta Round #23 | 8 |
| 7 | Lost Root | Codeforces | Codeforces Round #523 (Div. 2) | 9 |
| 8 | Digits | Codeforces | Bubble Cup X - Finals [Online Mirror] | 9 |