1 |
P1 - Watermelon |
Codeforces |
Codeforces Beta Round #4 (Div. 2 Only) |

2 |
P2 - Anton and Danik |
Codeforces |
Codeforces Round #379 (Div. 2) |

3 |
P3 - Bit++ |
Codeforces |
Codeforces Round #173 (Div. 2) |

4 |
P4 - Team |
Codeforces |
Codeforces Round #143 (Div. 2) |

5 |
P5 - Bear and Big Brother |
Codeforces |
Codeforces Round #405 (rated, Div. 2, based on VK Cup 2017 Round 1) |

6 |
P6 - Even Odds |
Codeforces |
Codeforces Round #188 (Div. 2) |

7 |
P7 - Anton and Letters |
Codeforces |
Codeforces Round #253 (Div. 2) |

8 |
P8 - Juicer |
Codeforces |
AIM Tech Round 3 (Div. 2) |

9 |
P9 - Anton and Danik |
Codeforces |
Codeforces Round #379 (Div. 2) |

10 |
P10 - Bulbs |
Codeforces |
Codeforces Round #338 (Div. 2) |

11 |
P11 - Army |
Codeforces |
School Personal Contest #1 (Winter Computer School 2010/11) - Codeforces Beta Round #38 (ACM-ICPC Rules) |

12 |
P12 - The number of positions |
Codeforces |
Codeforces Beta Round #92 (Div. 2 Only) |

13 |
P13 - Dasha and Stairs |
Codeforces |
Codeforces Round #394 (Div. 2) |

14 |
P14 - King Moves |
Codeforces |
Educational Codeforces Round 16 |

15 |
P15 - The number of positions |
Codeforces |
Codeforces Beta Round #92 (Div. 2 Only) |

16 |
P16 - Dasha and Stairs |
Codeforces |
Codeforces Round #394 (Div. 2) |

17 |
P17 - King Moves |
Codeforces |
Educational Codeforces Round 16 |

18 |
P18 - System of Equations |
Codeforces |
Codeforces Round #131 (Div. 2) |

19 |
P19 - Vasya and Socks |
Codeforces |
Codeforces Round #262 (Div. 2) |

20 |
P20 - Way Too Long Words |
Codeforces |
Codeforces Beta Round #65 (Div. 2) |