1 
P1  Building designing 
UVA 

2 
P2  Number of Ways 
Codeforces 
Codeforces Round #266 (Div. 2) 
3 
P3  Books 
Codeforces 
Codeforces Round #171 (Div. 2) 
4 
P4  They Are Everywhere 
Codeforces 
Codeforces Round #364 (Div. 2) 
5 
P5  Vasya and Robot 
Codeforces 
Codeforces Round #206 (Div. 1) & Codeforces Round #206 (Div. 2) 
6 
P6  Sereja and Dima 
Codeforces 
Codeforces Round #223 (Div. 2) 
7 
P7  Kefa and Company 
Codeforces 
Codeforces Round #321 (Div. 2) 
8 
P8  Complete the Word 
Codeforces 
Codeforces Round #372 (Div. 2) 