Good day to you, Codeforces!

Let me introduce you Codeforces Round #539, that will take place at Saturday, February 16, 2019 at 19:35. The round will be rated for both divisions.

The problems of this round were developed by markysha, xolm, aleex. That is our first round on Codeforces, and I hope not the last one :)

Thanks everyone who helped with tasks preparation:

• Our coordinator arsijo for his help with everything
• Thanks very much 244mhq, Mediocrity, sharepoLOVEDDD, austrian_artist, Adalbert, stanislav.bezkorovainyi, Fekete and Daryusz for testing this round (yeah, we approached testing thoroughly :))
• gepardo for playing a crutial role in the contest (what? you'll see)
• And of course MikeMirzayanov for Polygon and Codeforces.

There will be 6 tasks and 2 hours 30 minutes to solve them. As usual, the score distribution will be revealed shortly before the contest.

Wish you quick ideas and short solutions!

Upd.
Div. 1: 500 — 1250 — 1750 — 1750 — 2250 — 3000
Div. 2: 500 — 1000 — 1500 — 2250 — 2750 — 2750

Editorial

Final results are ready!

Div 1:
1. Um_nik
2. jqdai0815 (was so close...)
3. knightL
4. Swistakk
5. ToTLeS

Div 2:
1. schtamas
2. CheimaKH
3. revivedDevil
4. zhed
5. 1100011101

Congratulations to the winners!

Maybe see you later...

I could tell the story how my team trains to go to ACM ICPC (nohow), but it's not interesting)
It is more interesting to learn how to do nothing, but at the same time go to semi-final or final.
So I wonder if there are teams, that didn't train at all, but at the same time participated in semi-final (or were so close to it)? And how did you achieve such success?)

Some time ago I collected useful links from Codeforces, some of them are really cool, some are not.
Dtaft was created about a year ago, now it is June of 2019.
My friend asked me to give him some cool blogs from Codeforces, and I remembered about that blog.
So that is the reason why this blog is posted)
P.S. some blogs are only in russian