
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 
Persescript 
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 