Codeforces Round #555 (Div. 3)

Revision en10, by vovuh, 2019-04-27 16:40:23

Suddenly, this round will consist of 7 different problems also!

UPD2: The round will consist of 7 problems and one of them will be in easy and hard editions!


Hello! Codeforces Round #555 (Div. 3) will start at Apr/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. 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.

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.


UPD0: I also would like to thank my friend Adilbek adedalic Dalabaev for helping me with understanding problems difficulty and other help with round preparation!

UPD1: Big thanks to dreamoon_love_AA, Ashishgup, Jeel_Vaishnav and love.zy for testing the round!

UPD3: Editorial is published!


Congratulations to the winners:

Rank Competitor Problems Solved Penalty
1 FloodBenz 8 282
2 maguihong123 7 347
3 dreagonm 7 373
4 DeathYmz 7 571
5 BaiBatyr 6 189

Congratulations to the best hackers:

Rank Competitor Hack Count
1 WileE.Coyote 448:-33
2 Disappointment 127:-20
3 wzw19991105 39
4 ismagilov.code 50:-23
5 Kucha 20:-3
919 successful hacks and 365 unsuccessful hacks were made in total!

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

Problem Competitor Penalty
A ImNotExpert 0:01
B BaiBatyr 0:06
C1 Darshit_99 0:10
C2 Injetzk 0:16
D iamnotacoder 0:21
E BaiBatyr 0:12
F Injetzk 0:29
G Injetzk 1:15

Tags codeforces, 555, third division


  Rev. Lang. By When Δ Comment
ru10 Russian vovuh 2019-04-27 16:40:49 2726
en10 English vovuh 2019-04-27 16:40:23 2752
ru9 Russian vovuh 2019-04-27 16:30:03 76
en9 English vovuh 2019-04-27 16:29:47 80
en8 English vovuh 2019-04-26 17:51:57 8 Tiny change: 'r:dreamoon,2019-04-26], [user:A' -> 'r:dreamoon_love_AA], [user:A'
ru8 Russian vovuh 2019-04-26 17:47:20 8 Мелкая правка: 'r:dreamoon,2019-04-26], [user:A' -> 'r:dreamoon_love_AA], [user:A'
en7 English vovuh 2019-04-26 16:57:41 4 Tiny change: ' also!\n\nUPD2: The roun' -> ' also!\n\n**UPD2**: The roun'
ru7 Russian vovuh 2019-04-26 16:57:19 4 Мелкая правка: 'ач! :)\n\nUPD2: В раунде' -> 'ач! :)\n\n**UPD2**: В раунде'
ru6 Russian vovuh 2019-04-26 16:56:06 87
en6 English vovuh 2019-04-26 16:55:17 97
ru5 Russian vovuh 2019-04-26 14:18:12 32
en5 English vovuh 2019-04-26 14:17:42 36
ru4 Russian vovuh 2019-04-26 13:56:25 143
en4 English vovuh 2019-04-26 13:55:46 142
ru3 Russian vovuh 2019-04-25 16:00:22 176
en3 English vovuh 2019-04-25 15:59:21 187
en2 English vovuh 2019-04-25 12:12:27 0 (published)
ru2 Russian vovuh 2019-04-25 12:11:43 0 (опубликовано)
en1 English vovuh 2019-04-25 12:11:25 2374 Initial revision for English translation (saved to drafts)
ru1 Russian vovuh 2019-04-25 12:09:42 2347 Первая редакция (сохранено в черновиках)