1 
P1  Bits 
Codeforces 
Codeforces Round #276 (Div. 1) & Codeforces Round #276 (Div. 2) 
2 
P2  Preparing Olympiad 
Codeforces 
Codeforces Round #306 (Div. 2) 
3 
P3  The Child and Set 
Codeforces 
Codeforces Round #250 (Div. 2) 
4 
P4  Raising Bacteria 
Codeforces 
Codeforces Round #320 (Div. 2) [Bayan ThanksRound] 
5 
P5  Kquery 
SPOJ 

6 
P6  Greg and Array 
Codeforces 
Codeforces Round #179 (Div. 1) & Codeforces Round #179 (Div. 2) 
7 
P7  Coder Ratings 
SPOJ 

8 
P8  Pashmak and Parmida's problem 
Codeforces 
Codeforces Round #261 (Div. 2) 