1 
P1  Count on Cantor 
UVA 

2 
P2  Calculating Function 
Codeforces 
Codeforces Round #277 (Div. 2) 
3 
P3  Dreamoon and WiFi 
Codeforces 
Codeforces Round #272 (Div. 2) 
4 
P4  Meme Problem 
Codeforces 
Educational Codeforces Round 54 (Rated for Div. 2) 
5 
P5  Soldier and Number Game 
Codeforces 
Codeforces Round #304 (Div. 2) 
6 
P6  Binary Numbers AND Sum 
Codeforces 
Codeforces Round #515 (Div. 3) 
7 
P7  Little Girl and Maximum XOR 
Codeforces 
Codeforces Round #169 (Div. 2) 
8 
P8  Points and Powers of Two 
Codeforces 
Codeforces Round #486 (Div. 3) 
9 
P9  Iterated Linear Function 
Codeforces 
Educational Codeforces Round 13 