| Problem Name | Online Judge | Contest | Difficulty Level | |
|---|---|---|---|---|
| 1 | Long Long Message | PKU | 1 | |
| 2 | Longest Common Substring | SPOJ | 1 | |
| 3 | Lexicographical Substring Search | SPOJ | 1 | |
| 4 | Longest Common Substring II | SPOJ | 2 | |
| 5 | Substrings | SPOJ | 2 | |
| 6 | Password | Codeforces | Codeforces Beta Round #93 (Div. 1 Only) & Codeforces Beta Round #93 (Div. 2 Only) | 2 |
| 7 | Substring Query | CodeChef | 3 | |
| 8 | Substrings on a Tree | CodeChef | 4 | |
| 9 | Prefixes and Suffixes | Codeforces | Codeforces Round #246 (Div. 2) | 4 |
| 10 | Martian Strings | Codeforces | Codeforces Round #106 (Div. 2) | 6 |
| 11 | Cyclical Quest | Codeforces | Codeforces Round #146 (Div. 1) & Codeforces Round #146 (Div. 2) | 7 |
| 12 | Three strings | Codeforces | MemSQL Start[c]UP 2.0 - Round 1 | 8 |
| 13 | String | Codeforces | Codeforces Beta Round #92 (Div. 1 Only) | 8 |
| 14 | Deletion of Repeats | Codeforces | Codeforces Beta Round #19 | 8 |