| Problem Name | Online Judge | Contest | Difficulty Level | |
|---|---|---|---|---|
| 1 | Borze | Codeforces | Codeforces Beta Round #32 (Div. 2, Codeforces format) | 1 |
| 2 | Transform the Expression | SPOJ | 1 | |
| 3 | Complicated Expressions | SPOJ | 2 | |
| 4 | Any fool can do it | SPOJ | 2 | |
| 5 | Going to school | SPOJ | 3 | |
| 6 | Replace To Make Regular Bracket Sequence | Codeforces | Educational Codeforces Round 4 | 3 |
| 7 | Page Numbers | Codeforces | Codeforces Beta Round #34 (Div. 2) | 4 |
| 8 | Rebus | Codeforces | Codeforces Round #347 (Div. 1) & Codeforces Round #347 (Div. 2) | 4 |
| 9 | Facetook Priority Wall | Codeforces | Codeforces Beta Round #67 (Div. 2) | 5 |
| 10 | Bracket Sequence | Codeforces | Codeforces Round #138 (Div. 1) & Codeforces Round #138 (Div. 2) | 5 |
| 11 | Email address | Codeforces | Codeforces Beta Round #40 (Div. 2) | 5 |
| 12 | Boolean Logic | SPOJ | 5 | |
| 13 | Bitwise Formula | Codeforces | Codeforces Round #402 (Div. 1) & Codeforces Round #402 (Div. 2) | 5 |
| 14 | Cells | SPOJ | 5 | |
| 15 | Text Messaging | Codeforces | Codeforces Beta Round #64 | 6 |
| 16 | Title | Codeforces | Codeforces Beta Round #55 (Div. 2) | 6 |
| 17 | A - Comparison Expressions | SPOJ | 6 | |
| 18 | Vanya and Brackets | Codeforces | Codeforces Round #308 (Div. 2) | 6 |
| 19 | Programming Language | Codeforces | Codeforces Round #126 (Div. 2) | 7 |
| 20 | Try and Catch | Codeforces | Codeforces Round #123 (Div. 2) | 7 |
| 21 | Corporation Mail | Codeforces | Codeforces Beta Round #52 (Div. 2) | 7 |
| 22 | bHTML Tables Analisys | Codeforces | Codeforces Beta Round #48 | 7 |
| 23 | C*++ Calculations | Codeforces | School Team Contest #1 (Winter Computer School 2010/11) | 8 |
| 24 | Defining Macros | Codeforces | Codeforces Beta Round #7 | 8 |
| 25 | Expression | Codeforces | Unknown Language Round #1 | 8 |
| 26 | Widget Library | Codeforces | Codeforces Beta Round #74 (Div. 1 Only) & Codeforces Beta Round #74 (Div. 2 Only) | 8 |
| 27 | BHTML+BCSS | Codeforces | Croc Champ 2012 - Qualification Round | 9 |
| 28 | Formurosa | Codeforces | Codeforces Round #134 (Div. 1) & Codeforces Round #134 (Div. 2) | 9 |
| 29 | Unambiguous Arithmetic Expression | Codeforces | Codeforces Beta Round #87 (Div. 1 Only) | 9 |
| 30 | Perse-script | Codeforces | Unknown Language Round #2 | 10 |
| 31 | Domain | Codeforces | Unknown Language Round #1 | 10 |
| 32 | Stack | Codeforces | Surprise Language Round #6 | 10 |
| 33 | Boolean Function | Codeforces | Codeforces Round #323 (Div. 1) | 10 |