Codeforces Round #486 (Div. 3)

Revision en8, by Vovuh, 2018-06-02 17:41:35


Codeforces Round #486 (Div. 3) will start on June 1 (Friday) at 14:35 (UTC). It will be the third Div.3 round in the history of Codeforces. You will be offered 6 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. Probably, participants from the first division will not be at all interested by this problems. And for 1600-1899 the problems will be too easy. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially.

The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests — just like you will be upset if many solutions fail after the contest is over.

Remember that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a trusted participants of the third division, you must:

  • take part in at least two rated rounds (and solve at least one problem in each of them),
  • do not have a point of 1900 or higher in the rating.

Regardless of whether you are a trusted participant of the third division or not, if your rating is less than 1600, then the round will be rated for you.

Thanks to MikeMirzayanov for the platform, help with ideas for problems and for coordination of my work. Thanks to Maksim Ne0n25 Mescheryakov and Ivan BledDest Androsov for testing the round.

UPD: I also would like to thank step_by_step and eddy1021 for testing the round and help with it preparation!

UPD2: You will be given 6 problems and 2 hours to solve them.

UPD3: Editorial is published. Thanks to Mikhail PikMike Piklyaev for the help with translation.


Congratulations to the winners (official results):

Rank Competitor Problems Solved Penalty
1 volamtruyenkyii 6 196
2 IOI2018 6 238
3 Student_of_Husayn 6 303
4 Omoshiroi_ 6 311
5 Deadpool 6 313
6 AHDPIYKO 6 341

Congratulations to the best hackers:

Rank Competitor Hack Count
1 jhonber 70:-1
2 djm03178 61:-4
3 applese 53:-1
4 WAI95 41:-3
5 step_by_step 38:-5
6 greencis 57:-45

530 successful hacks and 401 unsuccessful hacks were made in total!

And finally people who were the first to solve each problem:

Problem Competitor Penalty
A AhmedMohamd-BeatMeIFUCAN 0:02
B S1mplest_gu1 0:06
C S1mplest_gu1 0:12
D volamtruyenkyii 0:23
E Ycrpro 0:19
F MuieEcaterina 0:49

I hope that you will like the problems. If the problems in this round are too easy or too hard, then we will adjust the difficulties in the next Div. 3 rounds.

Good luck!

Tags codefroces, 486, third division


  Rev. Lang. By When Δ Comment
ru8 Russian Vovuh 2018-06-02 17:42:58 2871
en8 English Vovuh 2018-06-02 17:41:35 2876 Tiny change: 'he winners:\n<table ' -> 'he winners (official results):\n<table '
ru7 Russian Vovuh 2018-06-02 17:37:59 9 Мелкая правка: '18-06-02] за помощь' -> '18-06-02] Пикляеву за помощь'
en7 English Vovuh 2018-06-02 17:37:17 164
ru6 Russian Vovuh 2018-06-02 17:36:06 147
ru5 Russian Vovuh 2018-05-31 19:55:14 66
en6 English Vovuh 2018-05-31 19:53:40 69
en5 English Vovuh 2018-05-31 17:17:37 71
ru4 Russian Vovuh 2018-05-31 15:50:27 147
en4 English Vovuh 2018-05-31 15:49:45 153
en3 English Vovuh 2018-05-31 11:54:42 9 Tiny change: 'll be the second Div.3 ro' -> 'll be the third Div.3 ro'
ru3 Russian Vovuh 2018-05-31 11:54:22 6 Мелкая правка: '] &mdash; второй в истори' -> '] &mdash; третий в истори'
en2 English Vovuh 2018-05-31 11:13:39 0 (published)
ru2 Russian Vovuh 2018-05-31 11:13:32 0 (опубликовано)
en1 English Vovuh 2018-05-31 11:12:14 2073 Initial revision for English translation (saved to drafts)
ru1 Russian Vovuh 2018-05-31 11:08:52 1961 Первая редакция (сохранено в черновиках)