Hope that the last few days were quite productive for all of you in terms of rest and pleasure. Time to forget about messing with handle colors and get back to coding!
I'm proud to usher the first contest of the year — Codeforces Round #456, which is going to be held on Friday, 17:35 MSK. The round will be rated for all division 2 participants. Anyway, we will be glad to see whoever decides to join us out-of-competition :)
The authors are — GreenGrape and rek (don't worry, it's all about New Year magic ^^). My heartfelt gratitude to Kolya (KAN) for his invaluable help in round coordination, Grisha (gritukan) and Oleg (x3n) for testing and correcting statements, Dima (cdkrot) and Gleb (glebodin) for preliminary solving, AmirReza (Arpa) for close reading and Mike (MikeMirzayanov) for awesome Codeforces and Polygon platforms.
We look forward to brightening up your cold winter evening :)
GL & HF!
UPD. There will be five problems with the following scoring:
500 — 1000 — 1750 — 2000 — 2500
As usual, it's strictly recommended to look through all problems :)
UPD. Please note that the registration was delayed for a few hours.
UPD. The contest is over.
It turned out to be a little bit more complicated than we expected. Still we hope you learned something new :)
UPD. Congratulations to the winners!
Div. 1 (unofficial):