1 
P1  Hulk 
Codeforces 
Codeforces Round #366 (Div. 2) 
2 
P2  Pangram 
Codeforces 
Codeforces Round #295 (Div. 2) 
3 
P3  Wet Shark and Odd and Even 
Codeforces 
Codeforces Round #341 (Div. 2) 
4 
P4  Subprime 
UVA 

5 
P5  Burger Time? 
UVA 

6 
P6  Is it rated? 
Codeforces 
Codeforces Round #412 (rated, Div. 2, base on VK Cup 2017 Round 3) 
7 
P7  Multiplication Table 
Codeforces 
Codeforces Round #319 (Div. 2) 
8 
P8  Bear and Finding Criminals 
Codeforces 
Codeforces Round #356 (Div. 2) 
9 
P9  Punctuation 
Codeforces 
Codeforces Testing Round #4 
10 
P10  Bachgold Problem 
Codeforces 
Codeforces Round #388 (Div. 2) 
11 
P11  Taymyr is calling you 
Codeforces 
Codeforces Round #395 (Div. 2) 
12 
P12  Vitya in the Countryside 
Codeforces 
Codeforces Round #373 (Div. 2) 
13 
P13  Currency System in Geraldion 
Codeforces 
Codeforces Round #313 (Div. 2) 
14 
P14  Mahmoud and Longest Uncommon Subsequence 
Codeforces 
Codeforces Round #396 (Div. 2) 
15 
P15  Case of the Zeros and Ones 
Codeforces 
Codeforces Round #310 (Div. 2) 
16 
P16  Infinite Sequence 
Codeforces 
Codeforces Round #353 (Div. 2) 
17 
P17  Inna and Choose Options 
Codeforces 
Codeforces Round #234 (Div. 2) 
18 
P18  Buses Between Cities 
Codeforces 
Educational Codeforces Round 12 
19 
P19  Bus Game 
Codeforces 
Codeforces Beta Round #71 