| Problem Name | Online Judge | Contest | Difficulty Level | |
|---|---|---|---|---|
| 1 | Count on a tree | SPOJ | 1 | |
| 2 | K-th Number | SPOJ | 1 | |
| 3 | D-query | SPOJ | 1 | |
| 4 | To the moon | SPOJ | 4 | |
| 5 | Persistent Bookcase | Codeforces | Codeforces Round #368 (Div. 2) | 5 |
| 6 | Pathwalks | Codeforces | Divide by Zero 2018 and Codeforces Round #474 (Div. 1 + Div. 2, combined) | 6 |
| 7 | Army Creation | Codeforces | Educational Codeforces Round 22 | 7 |
| 8 | Till I Collapse | Codeforces | Codeforces Round #406 (Div. 1) & Codeforces Round #406 (Div. 2) | 7 |
| 9 | Functions On The Segments | Codeforces | Educational Codeforces Round 26 | 9 |