| Problem Name | Online Judge | Year | Contest | Difficulty Level | |
|---|---|---|---|---|---|
| 1 | Query on a tree | SPOJ | 1 | ||
| 2 | Query on a tree II | SPOJ | 1 | ||
| 3 | Count on a tree | SPOJ | 1 | ||
| 4 | Query on a tree again! | SPOJ | 1 | ||
| 5 | OTOCI | SPOJ | 2 | ||
| 6 | Can you answer these queries VII | SPOJ | 2 | ||
| 7 | Query on a tree IV | SPOJ | 2 | ||
| 8 | Query on a tree V | SPOJ | 2 | ||
| 9 | Count on a tree II | SPOJ | 2 | ||
| 10 | Tree | CodeChef | 3 | ||
| 11 | Gao on a tree | SPOJ | 3 | ||
| 12 | Prime Distance On Tree | CodeChef | 3 | ||
| 13 | Coloring Trees | SPOJ | 3 | ||
| 14 | Query on a tree VI | SPOJ | 3 | ||
| 15 | Dynamic GCD | CodeChef | 3 | ||
| 16 | Grass Planting | SPOJ | 4 | ||
| 17 | Tree Again | CodeChef | 4 | ||
| 18 | Propagating tree | Codeforces | Codeforces Round #225 (Div. 1) & Codeforces Round #225 (Div. 2) | 4 | |
| 19 | Query on a tree VI | CodeChef | 4 | ||
| 20 | Caves and Tunnels | Timus | 4 | ||
| 21 | Xenia and Tree | Codeforces | Codeforces Round #199 (Div. 2) | 4 | |
| 22 | Idols and Fans | CodeChef | 4 | ||
| 23 | Combat on a tree | SPOJ | 5 | ||
| 24 | Duff in the Army | Codeforces | Codeforces Round #326 (Div. 1) & Codeforces Round #326 (Div. 2) | 5 | |
| 25 | Observing the Tree | CodeChef | 5 | ||
| 26 | Imperial roads | Live Archive | 2017 | Latin America | 5 |
| 27 | Fibonacci Numbers on Tree | CodeChef | 6 | ||
| 28 | Black and White Tree | CodeChef | 6 | ||
| 29 | Case of Computer Network | Codeforces | Codeforces Round #310 (Div. 1) | 7 | |
| 30 | Push the Flow! | CodeChef | 7 | ||
| 31 | Happy Tree Party | Codeforces | Codeforces Round #329 (Div. 2) | 7 | |
| 32 | Beard Graph | Codeforces | Codeforces Round #112 (Div. 2) | 7 | |
| 33 | Scheme | Codeforces | Codeforces Beta Round #22 (Div. 2 Only) | 8 | |
| 34 | Graph Game | Codeforces | Codeforces Round #146 (Div. 1) | 9 | |
| 35 | ...Wait for it... | Codeforces | Codeforces Round #362 (Div. 1) | 9 | |
| 36 | Tree or not Tree | Codeforces | Codeforces Beta Round #88 | 10 |