1 |
P1 - The Meeting Place Cannot Be Changed |
Codeforces |
Codeforces Round #484 (Div. 2) |

2 |
P2 - Minimal k-covering |
Codeforces |
Educational Codeforces Round 43 (Rated for Div. 2) |

3 |
P3 - Lightsabers (hard) |
Codeforces |
Helvetic Coding Contest 2018 online mirror (teams allowed, unrated) |

4 |
P4 - Binary Cards |
Codeforces |
Codeforces Round #469 (Div. 1) |

5 |
P5 - Erasing Substrings |
Codeforces |
Educational Codeforces Round 38 (Rated for Div. 2) |

6 |
P6 - Stranger Trees |
Codeforces |
Codeforces Round #459 (Div. 1) |

7 |
P7 - Strongly Connected Tournament |
Codeforces |
Hello 2018 |

8 |
P8 - Arkady and a Nobody-men |
Codeforces |
Codeforces Round #434 (Div. 1, based on Technocup 2018 Elimination Round 1) |

9 |
P9 - Karen and Cards |
Codeforces |
Codeforces Round #419 (Div. 1) |

10 |
P10 - Mister B and Flight to the Moon |
Codeforces |
Codeforces Round #421 (Div. 1) |

11 |
P11 - Madness |
Codeforces |
Codeforces Round #422 (Div. 2) |

12 |
P12 - Strange Radiation |
Codeforces |
Codeforces Round #425 (Div. 2) |

13 |
P13 - Vasya and Shifts |
Codeforces |
Codeforces Round #425 (Div. 2) |

14 |
P14 - Ever-Hungry Krakozyabra |
Codeforces |
Codeforces Round #426 (Div. 1) & Codeforces Round #426 (Div. 2) |

15 |
P15 - Red-Black Cobweb |
Codeforces |
Codeforces Round #426 (Div. 1) |

16 |
P16 - Functions On The Segments |
Codeforces |
Educational Codeforces Round 26 |

17 |
P17 - Upgrading Tree |
Codeforces |
AIM Tech Round 4 (Div. 1) & AIM Tech Round 4 (Div. 2) |

18 |
P18 - Nikita and game |
Codeforces |
Codeforces Round #430 (Div. 2) |

19 |
P19 - Tournament Construction |
Codeforces |
Codeforces Round #432 (Div. 1, based on IndiaHacks Final Round 2017) |

20 |
P20 - Random Elections |
Codeforces |
Codeforces Round #432 (Div. 1, based on IndiaHacks Final Round 2017) |

21 |
P21 - Rainbow Balls |
Codeforces |
Codeforces Round #432 (Div. 1, based on IndiaHacks Final Round 2017) |