On Thursday, July 13, 2017, at 15:05 UTC Codeforces Round #424 will be held. Some of the problems will be from VK Cup 2017 Finals, some are prepared by Codeforces team to complete the problemset.
There will be six problems in the second division, five as usual in the first, three of them shared. The problems of this round are proposed, prepared and tested by: send_nodes, akvasha, ilya_the_lamer, fcspartakm, Perforator, MikeMirzayanov, PavelKunyavskiy, qwerty787788, Belonogov, izban, tourist, vepifanov, AlexFetisov, winger, Errichto, Gassa, naagi, 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 as well! Namely, among participants solved five or more problems in second division, or two 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.
Congratulations to the winners!
The analysis is here.
The problems correspond to problems of VK Cup 2017 - Finals as follows:
- Problem 830C - Bamboo Partition — is problem 823C - Bamboo Partition, author is me;
- Problem 830D - Singer House — is problem 823E - Singer House, authors are send_nodes and me;
- Problem 830E - Perpetual Motion Machine — is problem 823F - Perpetual Motion Machine, authors are akvasha and ilya_the_lamer.