Codeforces Global Round 17

Revision en7, by AliShahali1382, 2021-11-20 18:39:47

Hello, Codeforces!

On Nov/23/2021 17:35 (Moscow time) we will host Codeforces Global Round 17.

It is the fifth round of a 2021 series of Codeforces Global Rounds. The rounds are open and rated for everybody.

The prizes for this round:

  • 30 best participants get a t-shirt.
  • 20 t-shirts are randomly distributed among those with ranks between 31 and 500, inclusive.

The prizes for the 6-round series in 2021:

  • In each round top-100 participants get points according to the table.
  • The final result for each participant is equal to the sum of points he gets in the four rounds he placed the highest.
  • The best 20 participants over all series get sweatshirts and place certificates.

Thanks to XTX, which in 2021 supported the global rounds initiative!

The problems were written and prepared by AliShahali1382(Ali Shahali), DeadlyCritic(MohammadHossein Paydar), AmShZ(AmirMohammad ShahRezaei), Soroush(Soroush Sahraei), Keshi(Alireza Keshavarz), Davoth(Alireza Samimi), alireza_kaviani(Alireza Kaviani).

We would like to thank these people:

isaf27, the one who did a lot of things for the round to happen Shinchan01, Absyarka, Ziware, ijxjdjd, m371, Kotehok3, 221,physics0523, Igorbunov, kpw29, Kirill22, 1-gon, pashka for testing Kirill22 for submitting many different solutions 1-gon for being a VIP tester and his hilarious greetings in russian kpw29 for spending much time discussing the problems with me physics0523 for making researches about the tasks (as he always does) MikeMirzayanov for Codeforces and Polygon platforms and for his immeasurable contribution to the development of the community! You will have 2.5 hours to solve 8 problems. As always, we highly recommend reading all problems. Moreover, we really hope you upsolve the problems after the round, there are some interesting things to find out!

History

 
 
 
 
Revisions
 
 
  Rev. Lang. By When Δ Comment
en29 English DeadlyCritic 2021-11-24 03:57:55 67
en28 English AliShahali1382 2021-11-23 17:28:56 4
en27 English DeadlyCritic 2021-11-23 17:28:00 133
en26 English DeadlyCritic 2021-11-23 17:26:35 0 (published)
en25 English DeadlyCritic 2021-11-23 17:25:32 101 Reverted to en21
en24 English DeadlyCritic 2021-11-23 17:24:37 49
en23 English DeadlyCritic 2021-11-23 17:23:48 42
en22 English DeadlyCritic 2021-11-23 17:23:09 76 (saved to drafts)
en21 English AliShahali1382 2021-11-22 21:09:38 13 Tiny change: '021-11-20]و [user:moh' -> '021-11-20], [user:moh' (published)
en20 English AliShahali1382 2021-11-22 21:08:55 26 Tiny change: '021-11-20].\n<li> a' -> '021-11-20]و [user:mohammad_rastegar].\n<li> a' (saved to drafts)
en19 English AliShahali1382 2021-11-22 14:44:56 33 Tiny change: 'ser:aarr],[user:Pars' -> 'ser:aarr], [user:Pars'
en18 English AmShZ 2021-11-21 19:51:49 3
en17 English AmShZ 2021-11-21 19:51:03 25 Tiny change: '21-11-20], [user:nor' -> '21-11-20],[user:Parsa84] [user:nor'
en16 English AmShZ 2021-11-21 19:49:37 26 Tiny change: '0], [user:Parsa84, 2021-11-20][user:nor,' -> '0], [user:nor,'
en15 English AmShZ 2021-11-21 19:48:21 26 Tiny change: '0], [user:nor,' -> '0], [user:Parsa84, 2021-11-20][user:nor,'
en14 English AliShahali1382 2021-11-21 01:46:25 0 (published)
en13 English AliShahali1382 2021-11-21 01:45:29 63
en12 English AliShahali1382 2021-11-21 01:44:12 31 Tiny change: '21-11-20], [user:prab' -> '21-11-20],[user:ArshiaDadras] ,[user:prab'
en11 English AliShahali1382 2021-11-20 20:06:59 70
en10 English AliShahali1382 2021-11-20 19:53:20 70
en9 English AliShahali1382 2021-11-20 19:46:48 889
en8 English AliShahali1382 2021-11-20 19:14:04 669
en7 English AliShahali1382 2021-11-20 18:39:47 256
en6 English AliShahali1382 2021-11-20 18:33:05 320
en5 English AliShahali1382 2021-11-20 18:21:47 33
en4 English AliShahali1382 2021-11-20 18:19:17 37
en3 English DeadlyCritic 2021-11-20 18:16:38 97
en2 English AliShahali1382 2021-11-20 18:15:13 28
en1 English AliShahali1382 2021-11-20 18:12:35 1663 Initial revision (saved to drafts)