Hello everybody!

Congratulations to the platform Codeforces with an 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!

UPD: Contest is finished! I hope you enjoyed the round:)

UPD: Editorial. The problem E will be posted soon.

UPD: The problem E was posted.

Congratulations to the winners!!!

Div 1

1. KrK

2. zscc

3. wwwwodddd

4. uwi

5. oversolver

6. Shayan

7. dreamoon_love_AA

8. please_delete_account

9. alexrcoleman

10. guille

Div 2

1. zeronumber

2. Brightness

3. UBICA

4. Lyon_71

5. mmkh

6. I_Love_Adriana_Chechik

7. Ant_Man

8. yuvalsalant

9. Natsume_Mio

10. PuriceLoh420