1 |
P1 - Primes on Interval |
Codeforces |
Codeforces Round #147 (Div. 2) |

2 |
P2 - Bear and Poker |
Codeforces |
Codeforces Round #318 [RussianCodeCup Thanks-Round] (Div. 1) & Codeforces Round #318 [RussianCodeCup Thanks-Round] (Div. 2) |

3 |
P3 - Sherlock and his girlfriend |
Codeforces |
ICM Technex 2017 and Codeforces Round #400 (Div. 1 + Div. 2, combined) |

4 |
P4 - Amr and Music |
Codeforces |
Codeforces Round #287 (Div. 2) |

5 |
P5 - Little Elephant and Bits |
Codeforces |
Codeforces Round #157 (Div. 1) & Codeforces Round #157 (Div. 2) |

6 |
P6 - USB Flash Drives |
Codeforces |
Educational Codeforces Round 3 |

7 |
P7 - Dishonest Sellers |
Codeforces |
Codeforces Round #402 (Div. 2) |

8 |
P8 - Little Girl and Maximum Sum |
Codeforces |
Codeforces Round #169 (Div. 2) |

9 |
P9 - Gravity Flip |
Codeforces |
Codeforces Round #238 (Div. 2) |

10 |
P10 - Pashmak and Flowers |
Codeforces |
Codeforces Round #261 (Div. 2) |

11 |
P11 - Worms |
Codeforces |
Codeforces Round #271 (Div. 2) |

12 |
P12 - To Add or Not to Add |
Codeforces |
Codeforces Round #143 (Div. 2) |

13 |
P13 - Stones on the Table |
Codeforces |
Codeforces Round #163 (Div. 2) |

14 |
P14 - Young Physicist |
Codeforces |
Codeforces Beta Round #63 (Div. 2) |

15 |
P15 - Game With Sticks |
Codeforces |
Codeforces Round #258 (Div. 2) |

16 |
P16 - Anton and Letters |
Codeforces |
Codeforces Round #253 (Div. 2) |

17 |
P17 - Fox And Snake |
Codeforces |
Codeforces Round #290 (Div. 2) |

18 |
P18 - New Year Candles |
Codeforces |
Good Bye 2013 |

19 |
P19 - Cheap Travel |
Codeforces |
Codeforces Round #266 (Div. 2) |

20 |
P20 - Initial Bet |
Codeforces |
Codeforces Round #273 (Div. 2) |

21 |
P21 - Crazy Computer |
Codeforces |
Codeforces Round #372 (Div. 2) |