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Problem Name Online Judge Contest Difficulty Level
1 Registration System Categories Codeforces Codeforces Beta Round #4 (Div. 2 Only) 1
2 Winner Categories Codeforces Codeforces Beta Round #2 1
3 Vitaliy and Pie Categories Codeforces Codeforces Round #297 (Div. 2) 1
4 OR in Matrix Categories Codeforces Codeforces Round #277 (Div. 2) 1
5 Password Categories Codeforces Codeforces Beta Round #93 (Div. 1 Only) & Codeforces Beta Round #93 (Div. 2 Only) 2
6 Equivalent Strings Categories Codeforces Codeforces Round #313 (Div. 1) & Codeforces Round #313 (Div. 2) 2
7 Bear and Three Musketeers Categories Codeforces Codeforces Round #318 [RussianCodeCup Thanks-Round] (Div. 2) 2
8 FIGUREFUL Categories SPOJ 2
9 Watto and Mechanism Categories Codeforces Codeforces Round #291 (Div. 2) 3
10 VOI 2013 - Trao ?ổi thông tin Categories SPOJ Vietnam 3
11 Common Divisors Categories Codeforces Codeforces Round #117 (Div. 2) 3
12 Good Substrings Categories Codeforces Codeforces Round #166 (Div. 2) 3
13 Long Jumps Categories Codeforces Codeforces Round #274 (Div. 2) & Codeforces Round #274 (Div. 1) 3
14 Gargari and Bishops Categories Codeforces Codeforces Round #264 (Div. 2) 3
15 Almost Arithmetical Progression Categories Codeforces Codeforces Round #156 (Div. 2) & Codeforces Round #156 (Div. 1) 4
16 King's Path Categories Codeforces Codeforces Round #149 (Div. 2) 4
17 Queries for Number of Palindromes Categories Codeforces CROC-MBTU 2012, Elimination Round (ACM-ICPC) 4
18 Train and Peter Categories Codeforces Codeforces Beta Round #8 4
19 Tavas and Malekas Categories Codeforces Codeforces Round #299 (Div. 2) & Codeforces Round #299 (Div. 1) 4
20 Correcting Mistakes Categories Codeforces VK Cup 2015 - Round 2 (unofficial online mirror, Div. 1 only) 5
21 Spy Syndrome 2 Categories Codeforces Manthan, Codefest 16 5
22 Fibonacci-ish Categories Codeforces Manthan, Codefest 16 5
23 Caesar Cipher Categories UVA 5
24 New Year and Ancient Prophecy Categories Codeforces Good Bye 2015 5
25 Palindrome Degree Categories Codeforces Codeforces Beta Round #7 5
26 Petr# Categories Codeforces Codeforces Beta Round #86 (Div. 1 Only) & Codeforces Beta Round #86 (Div. 2 Only) 5
27 Replacing Digits Categories Codeforces VK Cup 2012 Round 2 (Unofficial Div. 2 Edition) 5
28 Sets Categories Codeforces Yandex.Algorithm 2011 Qualification 2 5
29 Om Nom and Necklace Categories Codeforces ZeptoLab Code Rush 2015 6
30 LIS of Sequence Categories Codeforces Codeforces Round #277 (Div. 2) 6
31 Test Categories Codeforces Codeforces Beta Round #25 (Div. 2 Only) 6
32 String Categories Codeforces Codeforces Beta Round #94 (Div. 1 Only) & Codeforces Beta Round #94 (Div. 2 Only) 6
33 Beaver Categories Codeforces Codeforces Beta Round #71 6
34 Bear and Polynomials Categories Codeforces VK Cup 2016 - Round 1 6
35 Double Profiles Categories Codeforces Codeforces Round #109 (Div. 1) & Codeforces Round #109 (Div. 2) 6
36 Fedor and Essay Categories Codeforces Codeforces Round #267 (Div. 2) 6
37 Kefa and Watch Categories Codeforces Codeforces Round #321 (Div. 2) 6
38 Spelling Check Categories Codeforces School Team Contest #1 (Winter Computer School 2010/11) 6
39 Messenger Categories Codeforces Codeforces Round #344 (Div. 2) 6
40 Acyclic Organic Compounds Categories Codeforces Codeforces Round #333 (Div. 1) 7
41 Counter Attack Categories Codeforces Codeforces Round #120 (Div. 2) 7
42 Peterson Polyglot Categories Codeforces Codeforces Round #402 (Div. 1) & Codeforces Round #402 (Div. 2) 7
43 Tree-String Problem Categories Codeforces Croc Champ 2013 - Qualification Round 7
44 Marbles Categories Codeforces Codeforces Round #336 (Div. 1) & Codeforces Round #336 (Div. 2) 7
45 Encoding Categories Codeforces VK Cup 2015 - Round 2 (unofficial online mirror, Div. 1 only) 7
46 President and Roads Categories Codeforces Codeforces Round #Pi (Div. 2) 7
47 The Untended Antiquity Categories Codeforces Codeforces Round #439 (Div. 2) 7
48 The angry professor Categories SPOJ 7
49 Good Substrings Categories Codeforces ABBYY Cup 3.0 7
50 Sereja and Squares Categories Codeforces Codeforces Round #243 (Div. 1) 7
51 Deletion of Repeats Categories Codeforces Codeforces Beta Round #19 8
52 DZY Loves Strings Categories Codeforces Codeforces Round #254 (Div. 1) 8
53 Cutting Jigsaw Puzzle Categories Codeforces Codeforces Beta Round #50 8
54 Permutation Categories Codeforces MemSQL Start[c]UP 2.0 - Round 1 8
55 Restoring the Expression Categories Codeforces Codeforces Round #451 (Div. 2) 8
56 Don't fear, DravDe is kind Categories Codeforces Codeforces Beta Round #28 (Codeforces format) 8
57 Tricky and Clever Password Categories Codeforces Codeforces Beta Round #30 (Codeforces format) 8
58 Two Permutations Categories Codeforces Codeforces Round #131 (Div. 1) 8
59 Fractal Detector Categories Codeforces Codeforces Round #141 (Div. 2) 8
60 String Transformation Categories Codeforces Codeforces Beta Round #90 9
61 Have You Ever Heard About the Word? Categories Codeforces Codeforces Round #189 (Div. 1) 9
62 Timofey and a flat tree Categories Codeforces Codeforces Round #395 (Div. 1) 9
63 Superhero's Job Categories Codeforces VK Cup 2015 - Round 3 (unofficial online mirror, Div. 1 only) 9
64 The Next Good String Categories Codeforces Codeforces Round #124 (Div. 1) 9
65 Harry Potter and the Sorting Hat Categories Codeforces Codeforces Beta Round #60 9
66 Xenia and String Problem Categories Codeforces Codeforces Round #207 (Div. 1) 9
67 Berland Local Positioning System Categories Codeforces Codeforces Round #298 (Div. 2) 9
68 Polycarpus is Looking for Good Substrings Categories Codeforces VK Cup 2012 Finals (unofficial online-version) 9
69 And Yet Another Bracket Sequence Categories Codeforces VK Cup 2015 - Round 1 9
70 Largest Submatrix 3 Categories Codeforces Codeforces Round #239 (Div. 1) 9
71 Simplified Nonogram Categories Codeforces Codeforces Round #298 (Div. 2) 9
72 Looking for Owls Categories Codeforces Codeforces Round #203 (Div. 2) 10
73 Misha and LCP on Tree Categories Codeforces Codeforces Round #285 (Div. 1) 10
74 Puzzle Lover Categories Codeforces Codeforces Round #339 (Div. 1) 10
75 Rap God Categories Codeforces Codeforces Round #406 (Div. 1) 10