| Problem Name | Online Judge | Contest | Difficulty Level | |
|---|---|---|---|---|
| 1 | The Decoder | UVA | 1 | |
| 2 | Query on a tree V | SPOJ | 2 | |
| 3 | Distance in Tree | Codeforces | VK Cup 2012 Round 1 | 3 |
| 4 | Prime Distance On Tree | CodeChef | 3 | |
| 5 | Gao on a tree | SPOJ | 3 | |
| 6 | Ciel the Commander | Codeforces | Codeforces Round #190 (Div. 1) & Codeforces Round #190 (Div. 2) | 4 |
| 7 | Xenia and Tree | Codeforces | Codeforces Round #199 (Div. 2) | 4 |
| 8 | Vacation | CodeChef | 6 | |
| 9 | Black and White Tree | CodeChef | 6 | |
| 10 | New Year Tree | Codeforces | Good Bye 2013 | 6 |
| 11 | Union on Tree | CodeChef | 7 | |
| 12 | Rowena Ravenclaw's Diadem | Codeforces | Manthan, Codefest 17 | 8 |
| 13 | Sagheer and Kindergarten | Codeforces | Codeforces Round #417 (Div. 2) | 9 |
| 14 | Arkady and a Nobody-men | Codeforces | Codeforces Round #434 (Div. 1, based on Technocup 2018 Elimination Round 1) | 9 |