On Tuesday, July 11, 2017, at 16:35 UTC Codeforces Round #423 will be held. Some of the problems will be from VK Cup 2017 Finals, some are prepared by Codeforces team to complete the problemset.
Note that there will be two rounds based on VK Cup Finals, so I want to ask finalists not to discuss problems until the end of the second round.
There will be six problems in each division, four of them shared. The problems of this round are proposed, prepared and tested by: vintage_Vlad_Makeev, demon1999, fcspartakm, Perforator, MikeMirzayanov, PavelKunyavskiy, qwerty787788, Belonogov, izban, tourist, vepifanov, AlexFetisov, winger, Errichto, Gassa, naagi, I_Remember_Olya_ashmelev, Endagorion, ifsmirnov, Arterm and me. Huge thanks to all who helped with the preparation!
There will be prizes from VK social network in this round! Namely, among participants solved five or more problems in second division, or three or more problems in first division, five are to be selected randomly. They will receive championship souvenirs. There is no country nor language restriction, everyone can win a prize. One don't have to have participated in VK Cup to receive the prize. Exact selection algorithm will be announced before the start of the round. There will be prizes in the second round using Finals' problems as well!
Congratulations to the winners!
The analysis is here.
Corresponding problems from VK Cup 2017 - Finals:
- Problem 827B - High Load is problem 823A - High Load, the author is MikeMirzayanov;
- Problem 827C - DNA Evolution is problem 823B - DNA Evolution, the authors are MikeMirzayanov and me;
- Problem 827E - Rusty String is problem 823D - Rusty String, the authors are vintage_Vlad_Makeev and demon1999;
- Problem 827F - Dirty Arkady's Kitchen is problem 823G - Dirty Arkady's Kitchen, the authors are demon1999 and vintage_Vlad_Makeev.
The souvenirs winners are:
|Eligible list place||Contest||Rank||Handle|