1 |
P1 - Megacity |
Codeforces |
Codeforces Round #242 (Div. 2) |

2 |
P2 - University Classes |
Codeforces |
2017-2018 ACM-ICPC, NEERC, Southern Subregional Contest, qualification stage (Online Mirror, ACM-ICPC Rules, Teams Preferred) |

3 |
P3 - Oleg and shares |
Codeforces |
Tinkoff Challenge - Elimination Round |

4 |
P4 - Enlarge GCD |
Codeforces |
Codeforces Round #511 (Div. 1) & Codeforces Round #511 (Div. 2) |

5 |
P5 - Alyona and Spreadsheet |
Codeforces |
Codeforces Round #401 (Div. 2) |

6 |
P6 - Barcode |
Codeforces |
Codeforces Round #139 (Div. 2) |

7 |
P7 - Point on Spiral |
Codeforces |
Codeforces Round #171 (Div. 2) |

8 |
P8 - Mahmoud and Ehab and the wrong algorithm |
Codeforces |
Codeforces Round #473 (Div. 2) |

9 |
P9 - Vanya and Label |
Codeforces |
Codeforces Round #355 (Div. 2) |

10 |
P10 - Kuro and Walking Route |
Codeforces |
Codeforces Round #482 (Div. 2) |

11 |
P11 - Recycling Bottles |
Codeforces |
Codeforces Round #352 (Div. 1) & Codeforces Round #352 (Div. 2) |

12 |
P12 - Cows and Sequence |
Codeforces |
Codeforces Round #174 (Div. 1) & Codeforces Round #174 (Div. 2) |

13 |
P13 - Make a Permutation! |
Codeforces |
Codeforces Round #436 (Div. 2) |

14 |
P14 - Three-level Laser |
Codeforces |
VK Cup 2018 - Round 2 |

15 |
P15 - Ladder |
Codeforces |
Codeforces Round #171 (Div. 2) |

16 |
P16 - Exams |
Codeforces |
Codeforces Round #377 (Div. 2) |

17 |
P17 - Postcards and photos |
Codeforces |
Codeforces Beta Round #98 (Div. 2) |

18 |
P18 - DNA Alignment |
Codeforces |
Codeforces Round #295 (Div. 2) & Codeforces Round #295 (Div. 1) |

19 |
P19 - Minimum Value Rectangle |
Codeforces |
Educational Codeforces Round 49 (Rated for Div. 2) |

20 |
P20 - Win or Freeze |
Codeforces |
Codeforces Round #107 (Div. 1) & Codeforces Round #107 (Div. 2) |

21 |
P21 - Modular Equations |
Codeforces |
Codeforces Round #282 (Div. 2) |

22 |
P22 - Mr. Kitayuta, the Treasure Hunter |
Codeforces |
Codeforces Round #286 (Div. 2) & Codeforces Round #286 (Div. 1) |

23 |
P23 - Longest Regular Bracket Sequence |
Codeforces |
Codeforces Beta Round #5 |

24 |
P24 - Longtail Hedgehog |
Codeforces |
Codeforces Round #338 (Div. 2) |

25 |
P25 - Bear and String Distance |
Codeforces |
Educational Codeforces Round 8 |

26 |
P26 - Walking Between Houses |
Codeforces |
Codeforces Round #501 (Div. 3) |

27 |
P27 - Good Sequences |
Codeforces |
Codeforces Round #162 (Div. 1) & Codeforces Round #162 (Div. 2) |

28 |
P28 - Military Problem |
Codeforces |
Codeforces Round #498 (Div. 3) |

29 |
P29 - Fair |
Codeforces |
Codeforces Round #485 (Div. 1) & Codeforces Round #485 (Div. 2) |

30 |
P30 - Guest From the Past |
Codeforces |
Codeforces Round #342 (Div. 2) |