| Problem Name | Online Judge | Year | Contest | Difficulty Level | |
|---|---|---|---|---|---|
| 1 | Lowest Common Ancestor | SPOJ | 1 | ||
| 2 | Query on a tree II | SPOJ | 1 | ||
| 3 | Query on a tree | SPOJ | 1 | ||
| 4 | Ancestor | TJU | 2 | ||
| 5 | Closest Common Ancestors | TJU | 2 | ||
| 6 | Joining Couples | Live Archive | 2012 | Latin America | 2 |
| 7 | Distance Query | SPOJ | 2 | ||
| 8 | Flea circus | UVA | 3 | ||
| 9 | Ants Colony | UVA | 3 | ||
| 10 | Fools and Roads | Codeforces | Codeforces Round #121 (Div. 1) & Codeforces Round #121 (Div. 2) | 4 | |
| 11 | A and B and Lecture Rooms | Codeforces | Codeforces Round #294 (Div. 2) | 4 | |
| 12 | Children Trips | CodeChef | 5 | ||
| 13 | Duff in the Army | Codeforces | Codeforces Round #326 (Div. 1) & Codeforces Round #326 (Div. 2) | 5 | |
| 14 | Beard Graph | Codeforces | Codeforces Round #112 (Div. 2) | 7 |