I'd like to invite you to Codeforces Round #421 that will be held at June 27th, 2017 at 17:35 MSK.
Yes, it's my first round, and yes, it's another round from purple.
Great thanks to KAN for help in preparation of this round, dans for help on first stages and testing, Belonogov, white2302, hloya_ygrt, Perforator for testing the problems, and MikeMirzayanov for great systems Codeforces and Polygon.
As always, participants of both divisions will be given 5 problems and 2 hours to solve them. Scoring will be announced before the round.
Good Luck and Have Fun!
UPD1: Scoring is standart for both divisions: 500-1000-1500-2000-2500
We are working on the issue with problem A in div. 1. We will announce the decision later.
Due to the issue with problem A, the round is declared unrated. More details.
Nevermind all promblems, Editorial must be, so it's here.