Hello everyone!

Codeforces Round #258 (Div. 2) will take place on July 24, 19:30 MSK. Traditionally, Div. 1 users can take part out of the competition.

The round was prepared by PraveenDhinwa and me (JuanMata). This is our second Codeforces round, and hopefully not our last.

We have tried our best to make the problem statements as clear and interesting as possible. We hope that everyone will enjoy the round. :)

Special thanks to MikeMirzayanov for creating the wonderful Polygon and Codeforces platforms, Gerald for his extensive help in problem verification and testing, and Delinur for translation of problem statements into Russian. Without their help the contest would never have seen the day.

We wish all the participants good luck and high rating. :)

UPD: It is decided to use the dynamic scoring system.

UPD: Contest is finished. You can find the editorial here. :)

UPD: Congratulations to the winners. Here are the top 8 (the only ones to solve all the problems):

1. skank
2. western_theory
3. jurbhm538
4. chenrui9551
5. zhouhebin
6. MaxKU
7. jmas2711
8. hzwer

UPD: Wonderful statistics by DmitriyH can be found here. :)

Hello everyone! Codeforces Round #257 is coming soon.

In this round, you are going to meet our friend Jzzhu. Though my id is jzzhu, the real Jzzhu isn't me, and he is a very cute boy. Now he is facing some challenges. Can you help him to solve the problems?

The problem setters are gagaga5-gagaga and me, and thank ydc, jzc, fanhqme for testing.

Many thanks to Gerald for helping to prepare the round. Also I'd like to thank MikeMirzayanov for creating such a good platform.

Have a good time with Jzzhu!

UPD

In Div. 1, scores for each problem will be 500-1000-1500-2000-2500.

In Div. 2, scores for each problem will be 500-1000-1500-2000-2500.

UPD

The contest is over. Thanks for participating.

Congrats the winners.

Division 1:

1.semiexp

2.kutengine

3.rowdark

4.YuukaKazami

5.mruxim

Division 2:

1.swenyoo

2.chm517

3.Shinka

4.TBH

5.silly_girl

You can find editorial here.

Hello, CodeForces community! I'm happy to tell you about upcoming 256-th round, which will be held for the participants from second division. Participants from first division can take part out of the competition.

I hope, for all this anniversary round. For me it is the first round in which I am the author, in this I will be glad to see everyone. Want to say thanks Gerald for help with preparing contest, Delinur for translating, and of course MikeMirzayanov for CodeForces project.

I am from Krasnoyarsk, and the hero of tasks will be our team talisman Bizon-the-Champion. Hope you like to spend time with him :) See you and good luck!

UPD. Few hours before the start. Score distribution will be dynamic (see more information here)

UPD. Round is over! You can find editorial here.

Hello everyone! Codeforces Round #FF(255) is coming soon! We invite you to participate in this round, the round will be held in both divisions.

In this round, the boy DZY appears again! As we all know, he loves many things. This time he also brings us many interesting problems, which are easier than the problems in last round, but he still needs you help. In return, he will present rating to you.

Many thanks to Gerald for giving us much advice and helping us to prepare the round. Also many thanks to MikeMirzayanov, who created such a wonderful platform.

The problem setters are jcvb, jiry_2 and me. This is our first Codeforces round :)

Come and join us in helping DZY again, and you will take the high rating home!

Good luck and have fun! :)

UPD

In Div. 1, scores for each problem will be 500-1500-1500-2000-2500.

In Div. 2, scores for each problem will be 500-1000-1500-2500-2500.

UPD

The contest is over. Thanks for participating.

Congrats the winners.

Division 1:

1. vepifanov
2. subscriber
3. RAVEman
4. ztxz16
5. anta

Division 2:

1. llllllllllll
2. geniucos
3. Misha100896
4. Temirulan
5. wwt15

You can find editorial here.

Hello everyone! Codeforces Round #254 is coming soon.

In this round, there will be a really cute boy named DZY. He loves many things, we can even say everything. He has a great passion for the gorgeous world, but he can't deal with everything he's interested in. So he needs your help, and he will present rating in return.

My thanks go to Gerald, who gave me much advice and helped about the problems. And I also would like to thank MikeMirzayanov, who created such a wonderful platform.

The problem setters are FancyCoder and me, and thank vfleaking, jqdai0815 and lsmll for testing.

Come and join us in helping DZY.

Good luck and have fun.

UPD

In Div. 1, scores for each problem will be 500-1000-2000-2000-2500.

In Div. 2, scores for each problem will be 500-1000-1500-2000-3000.

UPD

For technical reasons, the round will be delayed by 5 minutes.

UPD

The contest is over. Thanks for participating.

Congrats the winners.

Division 1:

1. subscriber

2. flydutchman

3. uwi

4. Egor

5. stevenkplus

Division 2:

1. lost3030

2. laekov_

3. JongMan

4. Daumilas

5. nnahas

You can find editorial here

Oh yes! Only a few days left before the Championship finals! The teams have already gathered in Yekaterinburg, most of them have registered and are watching a game between Russia and Belgium.

I want to start from some history and remember that the tradition to publish travel notes about Saratov State University's trips to finals started back in 2005. The regular pattern is that almost every year when we made notes, our team won a medal. I won't try my luck, so here are some of the first impressions of this year.