Codeforces Round #587 (Div. 3)

Revision en3, by vovuh, 2019-09-21 12:09:58

Hello everyone! This round will be a little bit special because it is composed from the problemset of Saratov school elimination stage to the all-russian olympiad of school students. The problems were invented and prepared by Alexander fcspartakm Frolov, Ivan BledDest Androsov and me, Vladimir vovuh Petrov. Good luck to everyone!

UPD: Thanks to Daria nooinenoojno Stepanova and Danila sad101010 Smirnov for testing!

UPD2: We will open solutions to view and start the hacking phase a little bit later because the school elimination stage is not over yet. We will open all in about two hours.


Hello! Codeforces Round #587 (Div. 3) will start at Sep/21/2019 10:05 (Moscow time). You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. 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.

You will be given 6 or 7 (or 8) problems and 2 hours to solve them.

Note that the penalty for the wrong submission in this round (and the following Div. 3 rounds) is 10 minutes.

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 my good friends Mikhail awoo Piklyaev, Maksim Neon Mescheryakov and Ivan BledDest Androsov for help in round preparation and testing the round.

Good luck!

I also would like to say that participants who will submit wrong solutions on purpose and hack them afterwards (example) will not be shown in the hacking leaders table.


Tags codeforces, 587, third division


  Rev. Lang. By When Δ Comment
ru11 Russian vovuh 2019-09-21 22:03:47 76
en8 English vovuh 2019-09-21 22:03:27 80
ru10 Russian vovuh 2019-09-21 14:17:41 48
en7 English vovuh 2019-09-21 14:17:25 43 Tiny change: 'urs**.\n\n&lt;a' -> 'urs**.\n\n**UPD3**: Now you can discuss problems.\n\n&lt;a'
en6 English vovuh 2019-09-21 14:02:11 0 (published)
ru9 Russian vovuh 2019-09-21 14:02:04 0 (опубликовано)
en5 English vovuh 2019-09-21 13:02:21 0 (saved to drafts)
ru8 Russian vovuh 2019-09-21 13:02:16 0 (сохранено в черновиках)
ru7 Russian vovuh 2019-09-21 12:12:45 76
en4 English vovuh 2019-09-21 12:12:13 62
ru6 Russian vovuh 2019-09-21 12:10:59 174
en3 English vovuh 2019-09-21 12:09:58 182
ru5 Russian vovuh 2019-09-20 10:14:09 131
en2 English vovuh 2019-09-20 10:13:26 129
ru4 Russian vovuh 2019-09-20 10:08:37 1 Мелкая правка: 'де Саратове. Задачи д' -> 'де Саратов. Задачи д'
ru3 Russian vovuh 2019-09-20 10:07:17 0 (опубликовано)
en1 English vovuh 2019-09-20 10:07:08 2554 Initial revision for English translation
ru2 Russian vovuh 2019-09-20 10:05:41 12 Мелкая правка: '0] Петров.\n\n&lt;al' -> '0] Петров. Удачи всем!\n\n&lt;al'
ru1 Russian vovuh 2019-09-20 10:01:36 2523 Первая редакция (сохранено в черновиках)