Problem Name | Online Judge | Contest | Difficulty Level | |
---|---|---|---|---|

1 | Registration System | Codeforces | Codeforces Beta Round #4 (Div. 2 Only) | 1 |

2 | Vitaliy and Pie | Codeforces | Codeforces Round #297 (Div. 2) | 1 |

3 | Winner | Codeforces | Codeforces Beta Round #2 | 1 |

4 | OR in Matrix | Codeforces | Codeforces Round #277 (Div. 2) | 1 |

5 | Bear and Three Musketeers | Codeforces | Codeforces Round #318 [RussianCodeCup Thanks-Round] (Div. 2) | 2 |

6 | Password | Codeforces | Codeforces Beta Round #93 (Div. 1 Only) & Codeforces Beta Round #93 (Div. 2 Only) | 2 |

7 | FIGUREFUL | SPOJ | 2 | |

8 | Equivalent Strings | Codeforces | Codeforces Round #313 (Div. 1) & Codeforces Round #313 (Div. 2) | 2 |

9 | Simple Minded Hashing | UVA | 2 | |

10 | Good Substrings | Codeforces | Codeforces Round #166 (Div. 2) | 3 |

11 | Gargari and Bishops | Codeforces | Codeforces Round #264 (Div. 2) | 3 |

12 | VOI 2013 - Trao ?ổi thông tin | SPOJ Vietnam | 3 | |

13 | Common Divisors | Codeforces | Codeforces Round #117 (Div. 2) | 3 |

14 | Watto and Mechanism | Codeforces | Codeforces Round #291 (Div. 2) | 3 |

15 | Long Jumps | Codeforces | Codeforces Round #274 (Div. 2) & Codeforces Round #274 (Div. 1) | 3 |

16 | Almost Arithmetical Progression | Codeforces | Codeforces Round #156 (Div. 2) & Codeforces Round #156 (Div. 1) | 4 |

17 | Queries for Number of Palindromes | Codeforces | CROC-MBTU 2012, Elimination Round (ACM-ICPC) | 4 |

18 | King's Path | Codeforces | Codeforces Round #149 (Div. 2) | 4 |

19 | Tavas and Malekas | Codeforces | Codeforces Round #299 (Div. 2) & Codeforces Round #299 (Div. 1) | 4 |

20 | Train and Peter | Codeforces | Codeforces Beta Round #8 | 4 |

21 | Replacing Digits | Codeforces | VK Cup 2012 Round 2 (Unofficial Div. 2 Edition) | 5 |

22 | Correcting Mistakes | Codeforces | VK Cup 2015 - Round 2 (unofficial online mirror, Div. 1 only) | 5 |

23 | Fibonacci-ish | Codeforces | Manthan, Codefest 16 | 5 |

24 | Spy Syndrome 2 | Codeforces | Manthan, Codefest 16 | 5 |

25 | Petr# | Codeforces | Codeforces Beta Round #86 (Div. 1 Only) & Codeforces Beta Round #86 (Div. 2 Only) | 5 |

26 | Sets | Codeforces | Yandex.Algorithm 2011 Qualification 2 | 5 |

27 | New Year and Ancient Prophecy | Codeforces | Good Bye 2015 | 5 |

28 | Palindrome Degree | Codeforces | Codeforces Beta Round #7 | 5 |

29 | Kefa and Watch | Codeforces | Codeforces Round #321 (Div. 2) | 6 |

30 | Fedor and Essay | Codeforces | Codeforces Round #267 (Div. 2) | 6 |

31 | Double Profiles | Codeforces | Codeforces Round #109 (Div. 1) & Codeforces Round #109 (Div. 2) | 6 |

32 | Spelling Check | Codeforces | School Team Contest #1 (Winter Computer School 2010/11) | 6 |

33 | Bear and Polynomials | Codeforces | VK Cup 2016 - Round 1 | 6 |

34 | String | Codeforces | Codeforces Beta Round #94 (Div. 1 Only) & Codeforces Beta Round #94 (Div. 2 Only) | 6 |

35 | Om Nom and Necklace | Codeforces | ZeptoLab Code Rush 2015 | 6 |

36 | Test | Codeforces | Codeforces Beta Round #25 (Div. 2 Only) | 6 |

37 | Messenger | Codeforces | Codeforces Round #344 (Div. 2) | 6 |

38 | Caesar Cipher | UVA | 6 | |

39 | Beaver | Codeforces | Codeforces Beta Round #71 | 6 |

40 | LIS of Sequence | Codeforces | Codeforces Round #277 (Div. 2) | 6 |

41 | Acyclic Organic Compounds | Codeforces | Codeforces Round #333 (Div. 1) | 7 |

42 | Encoding | Codeforces | VK Cup 2015 - Round 2 (unofficial online mirror, Div. 1 only) | 7 |

43 | Peterson Polyglot | Codeforces | Codeforces Round #402 (Div. 1) & Codeforces Round #402 (Div. 2) | 7 |

44 | Good Substrings | Codeforces | ABBYY Cup 3.0 | 7 |

45 | President and Roads | Codeforces | Codeforces Round #Pi (Div. 2) | 7 |

46 | The Untended Antiquity | Codeforces | Codeforces Round #439 (Div. 2) | 7 |

47 | The angry professor | SPOJ | 7 | |

48 | Sereja and Squares | Codeforces | Codeforces Round #243 (Div. 1) | 7 |

49 | Tree-String Problem | Codeforces | Croc Champ 2013 - Qualification Round | 7 |

50 | Counter Attack | Codeforces | Codeforces Round #120 (Div. 2) | 7 |

51 | Marbles | Codeforces | Codeforces Round #336 (Div. 1) & Codeforces Round #336 (Div. 2) | 7 |

52 | Cutting Jigsaw Puzzle | Codeforces | Codeforces Beta Round #50 | 8 |

53 | Tricky and Clever Password | Codeforces | Codeforces Beta Round #30 (Codeforces format) | 8 |

54 | Permutation | Codeforces | MemSQL Start[c]UP 2.0 - Round 1 | 8 |

55 | Fractal Detector | Codeforces | Codeforces Round #141 (Div. 2) | 8 |

56 | Don't fear, DravDe is kind | Codeforces | Codeforces Beta Round #28 (Codeforces format) | 8 |

57 | DZY Loves Strings | Codeforces | Codeforces Round #254 (Div. 1) | 8 |

58 | Two Permutations | Codeforces | Codeforces Round #131 (Div. 1) | 8 |

59 | Restoring the Expression | Codeforces | Codeforces Round #451 (Div. 2) | 8 |

60 | Deletion of Repeats | Codeforces | Codeforces Beta Round #19 | 8 |

61 | Have You Ever Heard About the Word? | Codeforces | Codeforces Round #189 (Div. 1) | 9 |

62 | Timofey and a flat tree | Codeforces | Codeforces Round #395 (Div. 1) | 9 |

63 | String Transformation | Codeforces | Codeforces Beta Round #90 | 9 |

64 | Superhero's Job | Codeforces | VK Cup 2015 - Round 3 (unofficial online mirror, Div. 1 only) | 9 |

65 | And Yet Another Bracket Sequence | Codeforces | VK Cup 2015 - Round 1 | 9 |

66 | Polycarpus is Looking for Good Substrings | Codeforces | VK Cup 2012 Finals (unofficial online-version) | 9 |

67 | Largest Submatrix 3 | Codeforces | Codeforces Round #239 (Div. 1) | 9 |

68 | The Next Good String | Codeforces | Codeforces Round #124 (Div. 1) | 9 |

69 | Simplified Nonogram | Codeforces | Codeforces Round #298 (Div. 2) | 9 |

70 | Xenia and String Problem | Codeforces | Codeforces Round #207 (Div. 1) | 9 |

71 | Harry Potter and the Sorting Hat | Codeforces | Codeforces Beta Round #60 | 9 |

72 | Berland Local Positioning System | Codeforces | Codeforces Round #298 (Div. 2) | 9 |

73 | Rap God | Codeforces | Codeforces Round #406 (Div. 1) | 10 |

74 | Puzzle Lover | Codeforces | Codeforces Round #339 (Div. 1) | 10 |

75 | Misha and LCP on Tree | Codeforces | Codeforces Round #285 (Div. 1) | 10 |

76 | Looking for Owls | Codeforces | Codeforces Round #203 (Div. 2) | 10 |