Congratulations to the platform Codeforces with a Anniversary 450th round!
We are glad to report that Codeforces Round #450 (Div.2) takes place on December 11 19:05 MSK. The round will be rated for Div.2 participants. Traditionally, we invite Div.1 participants to join out of competition. I hope stronger participants also will find interesting problems for themselves:)
The problems are created by me and Nikita slelaron Kostlivcev. We want to show our great appreciation to Nikolay KAN Kalinin for round coordination, mike_live and Arpa for testing the problems and of course Mike MikeMirzayanov Mirzayanov for great platforms Codeforces and Polygon.
You will have 5 problems to solve in 2 hours.
Scoring as usual: 500 — 1000 — 1500 — 2000 — 2500.
Good luck to all and enjoy the problems!