| Problem Name | Online Judge | Year | Contest | Difficulty Level | |
|---|---|---|---|---|---|
| 1 | Periodic Strings | UVA | 1 | ||
| 2 | Power Strings | UVA | 1 | ||
| 3 | Extend to Palindrome | SPOJ | 1 | ||
| 4 | A Needle in the Haystack | SPOJ | 1 | ||
| 5 | I Love Strings!! | UVA | 1 | ||
| 6 | Period | SPOJ | 1 | ||
| 7 | Period | Live Archive | 2004 | Europe - Southeastern | 1 |
| 8 | Pattern Find | SPOJ | 1 | ||
| 9 | Find String Roots | SPOJ | 1 | ||
| 10 | The hunt for Gollum | SPOJ | 2 | ||
| 11 | String Tale | Timus | 2 | ||
| 12 | File Recover Testing | SPOJ | 2 | ||
| 13 | Remove The String | SPOJ | 2 | ||
| 14 | Password | Codeforces | Codeforces Beta Round #93 (Div. 1 Only) & Codeforces Beta Round #93 (Div. 2 Only) | 2 | |
| 15 | Extend to Palindrome | UVA | 2 | ||
| 16 | String Factoring | UVA | 3 | ||
| 17 | Abnormal 89's | UVA | 3 | ||
| 18 | Scrolling Sign | UVA | 3 | ||
| 19 | Finding Palindromes | SPOJ | 3 | ||
| 20 | Test | SPOJ | 3 | ||
| 21 | Dancing the Cheeky-Cheeky | UVA | 3 | ||
| 22 | Secret Word | UVA | 3 | ||
| 23 | Sevenk Love Oimaster | SPOJ | 4 | ||
| 24 | Tavas and Malekas | Codeforces | Codeforces Round #299 (Div. 2) & Codeforces Round #299 (Div. 1) | 4 | |
| 25 | Prefixes and Suffixes | Codeforces | Codeforces Round #246 (Div. 2) | 4 | |
| 26 | Matrix Matcher | UVA | 4 | ||
| 27 | MUH and Cube Walls | Codeforces | Codeforces Round #269 (Div. 2) | 4 | |
| 28 | Cow Patterns | SPOJ | 5 | ||
| 29 | Lucky Common Subsequence | Codeforces | Codeforces Round #201 (Div. 1) & Codeforces Round #201 (Div. 2) | 5 | |
| 30 | Obsessive String | Codeforces | Codeforces Round #282 (Div. 1) & Codeforces Round #282 (Div. 2) | 5 | |
| 31 | Match Maker | SPOJ | 6 | ||
| 32 | Caesar Cipher | UVA | 6 | ||
| 33 | Messenger | Codeforces | Codeforces Round #344 (Div. 2) | 6 | |
| 34 | Untitled Problem | SPOJ | 7 | ||
| 35 | String Transformation | Codeforces | Codeforces Beta Round #90 | 9 |