Codeforces Round #570 (Div. 3)

Revision en6, by vovuh, 2019-06-27 17:09:48


Hello! Codeforces Round #570 (Div. 3) will start at Jun/26/2019 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 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.


UPD: I also would like to thank Ashishgup and kocko for help with round preparation and testing!

UPD2: The contest will be extended for 15 minutes because the problems are more interesting than we thought. We also advise to read all the problems because some of them may have the same difficulty and we cannot know which one will be easier for you than the other.

UPD3: Editorial is published!


Congratulations to the winners:

Rank Competitor Problems Solved Penalty
1 Mbah1937 8 248
2 rtbmnie 8 450
3 BaiBatyr 8 455
4 LJF007 7 305
5 old_boo 7 322

Congratulations to the best hackers:

Rank Competitor Hack Count
1 MathY 120:-90
2 Radewoosh 75:-21
3 yzm10 36:-2
4 csegura 31
5 shaker007 30:-11
798 successful hacks and 492 unsuccessful hacks were made in total!

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

Problem Competitor Penalty
A blast 0:01
B Kirill_Kudr22 0:04
C I_love_HellHoleStudios 0:04
D divya_rawat 0:10
E llbra9z 0:13
F FlyInTheSky 0:42
G Mbah1937 0:27
H UMP45 0:25

Tags codeforces, 570, third division


  Rev. Lang. By When Δ Comment
ru5 Russian vovuh 2019-06-27 17:10:12 2740
en6 English vovuh 2019-06-27 17:09:48 2760
en5 English vovuh 2019-06-27 17:04:03 80
ru4 Russian vovuh 2019-06-27 17:03:40 76
ru3 Russian vovuh 2019-06-26 17:20:08 279
en4 English vovuh 2019-06-26 17:18:58 274
ru2 Russian vovuh 2019-06-26 15:43:45 141
en3 English vovuh 2019-06-26 15:43:20 138
en2 English vovuh 2019-06-25 09:26:34 0 (published)
ru1 Russian vovuh 2019-06-25 09:26:22 2178 Первая редакция перевода на Русский
en1 English vovuh 2019-06-25 09:25:02 2165 Initial revision (saved to drafts)