Codeforces Round #656 (Div. 3)

Revision en4, by vovuh, 2020-07-18 00:18:31


Hello! Codeforces Round 656 (Div. 3) will start at Jul/17/2020 17:35 (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 Daria nooinenoojno Stepanova, Mikhail awoo Piklyaev, Maksim Neon Mescheryakov and Ivan BledDest Androsov for help in round preparation and testing the round. Also thanks to Artem Rox Plotkin and Dmitrii _overrated_ Umnov for the discussion of ideas and testing the round!

Good luck!


UPD: Also thanks to infinitepro for help with statements and testing the round!

UPD2: Editorial is published!

Tags codeforces, 656, third division


  Rev. Lang. By When Δ Comment
ru6 Russian vovuh 2020-07-18 00:18:52 74
en4 English vovuh 2020-07-18 00:18:31 78
en3 English vovuh 2020-07-17 13:00:38 105
ru5 Russian vovuh 2020-07-17 13:00:13 101
en2 English vovuh 2020-07-16 14:12:03 48 (published)
ru4 Russian vovuh 2020-07-16 14:11:46 48 (опубликовано)
ru3 Russian vovuh 2020-07-16 14:10:25 2797
en1 English vovuh 2020-07-16 14:09:52 2133 Initial revision for English translation (saved to drafts)
ru2 Russian vovuh 2020-07-16 14:09:28 2797
ru1 Russian vovuh 2020-07-16 14:08:59 2128 Первая редакция (сохранено в черновиках)