1 |
P1 - Extra-terrestrial Intelligence |
Codeforces |
Codeforces Beta Round #36 |

2 |
P2 - Substring and Subsequence |
Codeforces |
VK Cup 2012 Round 2 |

3 |
P3 - Energy exchange |
Codeforces |
Codeforces Beta Round #62 |

4 |
P4 - Series of Crimes |
Codeforces |
Croc Champ 2012 - Round 2 (Unofficial Div. 2 Edition) |

5 |
P5 - Closest Equals |
Codeforces |
VK Cup 2015 - Qualification Round 1 |

6 |
P6 - Candies |
Codeforces |
Testing Round #6 |

7 |
P7 - Second price auction |
Codeforces |
Rockethon 2015 |

8 |
P8 - Land Lot |
Codeforces |
School Personal Contest #3 (Winter Computer School 2010/11) - Codeforces Beta Round #45 (ACM-ICPC Rules) |

9 |
P9 - Number Busters |
Codeforces |
Codeforces Round #224 (Div. 2) |

10 |
P10 - Magic Trick |
Codeforces |
MemSQL Start[c]UP 2.0 - Round 1 |

11 |
P11 - Segments |
Codeforces |
Codeforces Beta Round #22 (Div. 2 Only) |

12 |
P12 - Devu and Flowers |
Codeforces |
Codeforces Round #258 (Div. 2) |

13 |
P13 - Cola |
Codeforces |
School Team Contest #2 (Winter Computer School 2010/11) |

14 |
P14 - Martian Architecture |
Codeforces |
Codeforces Beta Round #53 |

15 |
P15 - Team Work |
Codeforces |
ICM Technex 2018 and Codeforces Round #463 (Div. 1 + Div. 2, combined) |

16 |
P16 - Petya and Spiders |
Codeforces |
Codeforces Beta Round #85 (Div. 1 Only) & Codeforces Beta Round #85 (Div. 2 Only) |

17 |
P17 - Seating of Students |
Codeforces |
Codeforces Round #454 (Div. 1, based on Technocup 2018 Elimination Round 4) & Codeforces Round #454 (Div. 2, based on Technocup 2018 Elimination Round 4) |

18 |
P18 - Distributed Join |
Codeforces |
MemSQL Start[c]UP 2.0 - Round 2 |

19 |
P19 - Three Base Stations |
Codeforces |
Codeforces Beta Round #48 |

20 |
P20 - Squares |
Codeforces |
Codeforces Beta Round #92 (Div. 1 Only) & Codeforces Beta Round #92 (Div. 2 Only) |

21 |
P21 - Bear and Drawing |
Codeforces |
Codeforces Round #318 [RussianCodeCup Thanks-Round] (Div. 1) & Codeforces Round #318 [RussianCodeCup Thanks-Round] (Div. 2) |

22 |
P22 - Digits Permutations |
Codeforces |
Codeforces Beta Round #99 (Div. 1) & Codeforces Beta Round #99 (Div. 2) |

23 |
P23 - Numbers |
Codeforces |
Codeforces Beta Round #94 (Div. 1 Only) |

24 |
P24 - Bulmart |
Codeforces |
2016-2017 ACM-ICPC, NEERC, Southern Subregional Contest (Online Mirror, ACM-ICPC Rules, Teams Preferred) |

25 |
P25 - Teams Formation |
Codeforces |
Codeforces Round #443 (Div. 1) & Codeforces Round #443 (Div. 2) |

26 |
P26 - Alice, Bob, Oranges and Apples |
Codeforces |
Codeforces Round #325 (Div. 1) & Codeforces Round #325 (Div. 2) |

27 |
P27 - Ghd |
Codeforces |
Codeforces Round #213 (Div. 1) |

28 |
P28 - Gift |
Codeforces |
All-Ukrainian School Olympiad in Informatics |

29 |
P29 - Vowels |
Codeforces |
Codeforces Round #225 (Div. 1) |

30 |
P30 - Mashmokh and Water Tanks |
Codeforces |
Codeforces Round #240 (Div. 1) |

31 |
P31 - Running Over The Bridges |
Codeforces |
2016-2017 ACM-ICPC, NEERC, Southern Subregional Contest (Online Mirror, ACM-ICPC Rules, Teams Preferred) |

32 |
P32 - Numbers |
Codeforces |
Codeforces Beta Round #72 (Div. 1 Only) |

33 |
P33 - Petya and Post |
Codeforces |
Codeforces Beta Round #61 (Div. 2) |

34 |
P34 - Beautiful Set |
Codeforces |
Codeforces Round #213 (Div. 1) & Codeforces Round #213 (Div. 2) |

35 |
P35 - Beautiful Road |
Codeforces |
Codeforces Beta Round #73 (Div. 1 Only) |

36 |
P36 - Memory for Arrays |
Codeforces |
Croc Champ 2013 - Finals (online version, Div. 1) |

37 |
P37 - Place Your Ad Here |
Codeforces |
VK Cup 2015 - Round 3 (unofficial online mirror, Div. 1 only) |

38 |
P38 - Playing with String |
Codeforces |
Codeforces Round #184 (Div. 2) |