Codeforces Round #615 (Div. 3)

Revision en4, by vovuh, 2020-01-23 13:43:51


Hello! Codeforces Round #615 (Div. 3) will start at Jan/22/2020 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.

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.


This is unusual, but good news! Our friends at Harbour.Space have a message for you:

Hello Muscat

Hi Codeforces!

As a special prize for the Codeforces Round #615, we would like to invite the top 3 participants to take part in our Hello Muscat ICPC Programming Bootcamp, which will take place in Oman, from March 19 to March 25, 2020. The prize will cover the participation fee, accommodation, and half-board meals for the entire duration of the bootcamp (except flights)!

There are three requirements to satisfy:

  • You took part in at least 10 rated contests on Codeforces
  • Your max rating should be less than 1900
  • You should be eligible for ICPC and/or IOI 2020+
Fill out the form→

So unofficial participants are also in a game (if meet the requirements).

Good luck to everyone!

UPD: I want to thank Artem Rox Plotkin and Dmitrii _overrated_ Umnov for invaluable help with the round preparation!

UPD2: Editorial is published!

Tags codeforces, 615, third division


  Rev. Lang. By When Δ Comment
en4 English vovuh 2020-01-23 13:43:51 80
ru5 Russian vovuh 2020-01-23 13:43:28 76
en3 English vovuh 2020-01-22 16:50:39 158
ru4 Russian vovuh 2020-01-22 16:49:27 164
ru3 Russian Una_Shem 2020-01-21 15:47:30 27
ru2 Russian Una_Shem 2020-01-21 15:42:01 1387 (опубликовано)
en2 English Una_Shem 2020-01-21 15:35:05 1339 (published)
en1 English vovuh 2020-01-20 23:04:23 2213 Initial revision for English translation (saved to drafts)
ru1 Russian vovuh 2020-01-20 23:03:31 2225 Первая редакция (сохранено в черновиках)