1 
P1  Alternating Current 
Codeforces 
Codeforces Round #200 (Div. 1) & Codeforces Round #200 (Div. 2) 
2 
P2  String Task 
Codeforces 
Codeforces Beta Round #89 (Div. 2) 
3 
P3  Petya and Strings 
Codeforces 
Codeforces Beta Round #85 (Div. 2 Only) 
4 
P4  Sonya and Queries 
Codeforces 
Codeforces Round #371 (Div. 1) & Codeforces Round #371 (Div. 2) 
5 
P5  A and B and Compilation Errors 
Codeforces 
Codeforces Round #294 (Div. 2) 
6 
P6  Registration System 
Codeforces 
Codeforces Beta Round #4 (Div. 2 Only) 
7 
P7  Unary 
Codeforces 
Codeforces Beta Round #96 (Div. 2) 
8 
P8  Sereja and Suffixes 
Codeforces 
Codeforces Round #215 (Div. 2) 
9 
P9  Throwing cards away I 
UVA 

10 
P10  Just Prune The List 
UVA 

11 
P11  Hardwood Species 
UVA 

12 
P12  Different is Good 
Codeforces 
Codeforces Round #352 (Div. 2) 
13 
P13  Letter 
Codeforces 
Codeforces Beta Round #42 (Div. 2) 
14 
P14  Hay Points 
UVA 

15 
P15  Babelfish 
UVA 

16 
P16  I Can Guess the Data Structure! 
UVA 
