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By Nickolas, 10 years ago, translation,

Hello,

Codeforces Round #105 will take place on February 2nd, 20:00 Moscow time.

This is a themed round, based on the fairy tales I write in Russian.

In this round we decided to conduct an experiment on smoothing the effects of problem setters misestimating the complexities of the problems: all problems have point values of 1000. We tried to order the problems by increasing difficulty, but this is a subjective opinion, so surprises are possible.

Thanks to MikeMirzayanov for the problem contributed to the round (who can guess which one of the five is not mine?) and to RAD for his help in preparing the problems.

Good luck at the round!

• +166

By freopen, 10 years ago, translation,

Hi there. I invite you to participate in my contest. It will take place in Codeforces::Gym at 15:00 (Moscow timezone — UTC+4) (Time in other regions).

Problems are rather easy, so it will be more interesting for div2 participants.

** Warning: I have only russian statements. This contest is only for those who can understand russian statements.**

Good luck

Alexey freopen Zolotov

• +67

By MikeMirzayanov, 10 years ago, translation,

Since almost every member of the community Codeforces know how to write programs, we decided to abandon the wysiwyg HTML editor, and introduce a geek method. Of course, technical texts will gain much more convenient, and text will look uniform.

Now we use modified Markdown as a markup language for blog posts and comments. Since we use an additional extensions, we called markup simply Codeforces Markup. Codeforces custom tags are available in the editor, I will publish a description of the rest here a little later. In a few words it looks like simplified previous version — double square brackets are replaced by single square bracket.

See description Markdown using the links:

Here's a short list of features:

1. insert user handle (use ~tourist);
2. italic and bold;
3. inline code — return a == 0 ? b : gcd(b % a, a); (place it between );
4. numerated, unnumerated and nested lists;
6. autocorrection hyphens with dashes;
7. smart URL detection (makes them to be links) http://codeforces.com/;
8. tables and images;
9. source code highlighting;
10. "smart" quotes;
11. separate paragraphs with a blank lines;
12. special Codeforces tags;
13. insert photos like [photoalbum:PicasaPublicAlbumURL]`;
14. and much more!

I recall that on Codeforces implement preview, so you do not need crazy experiments on the Markdown in comments:)

MikeMirzayanov

• +97

By MikeMirzayanov, 10 years ago, translation,

On January, 27 we summed up the results and rewarded the laureates. They are:

 tourist The Best Codeforces Participant 2011 Ripatti The Best Codeforces Problemsetter 2011 Alex_KPR The Best Codeforces Blogger 2011
• The Best Codeforces Participant 2011: Gennady tourist Korotkyevich. We've recounted the rating taking only the 2011 rounds into consideration. Gennady topped the table well ahead of everybody else! You can follow the link to track his success on Codeforces contests.
• The Best Codeforces Problem Writer 2011: Artem Ripatti Ripatti. In 2011, Artem prepared about 10 rounds on Codeforces and proved to be an author of interesting problems as well as a responsible partner. We are grateful to Artem for the help to the project and we hope for further collaboration.
• The Best Codeforces Blogger 2011: Alexander Alex_KPR Kouprin. Alexander's blog (mostly in Russian) frequently delighted readers with interesting posts. His reports on the Russian Code Cup, the ACM-ICPC finals, Petrozavodsk training camp aroused interest not only in regular readers but also attracted some new ones. Thank you!

The Codeforces project thanks all participants and post authors for the interest towards the project. But we want to say our special thanks to all problem authors!

MikeMirzayanov

Great news! I've received congratulations to the winners from Thomas Cormen (thank you!). Here is the full text:

Mike,

My apologies for the delay in responding. It has been an exceptionally busy term for me, teaching our new introductory course in Python (I'm learning the language along with my students), supervising our senior capstone project course, and chairing our department. You may post the following statement on your website:

Congratulations to Gennady "tourist" Korotkyevich (Best Codeforces Participant 2011), Artem Ripatti (Best Codeforces Problem Writer 2011), and Alexander "Alex_KPR" Kouprin (Best Codeforces Blogger 2011). Although Mike Mirzayanov hinted that we might be in for a change this year, I was not too surprised to see that "tourist" took the top participant spot once again. I applaud the winners and everyone else who takes part in Codeforces.

Tom Cormen
Professor and Chair
Dartmouth College Department of Computer Science
http://www.cs.dartmouth.edu/~thc/

• +112

Hey everyone,

There are no CodeForces rounds coming up, so I thought I would set up a training round in the new Gym. The problems are from our local contest which I helped organize last October. We used it to select our team for the ACM-ICPC. There is a large range of problem difficulties, so I am sure everyone will have interesting problems to solve.

It will be held on Saturday, 1/28 at 8am Moscow time (4-hour contest) in the CodeForces Gym. I hope you enjoy the problems!

Update: The contest is over. Thanks for participating! If you didn't, please check out the problems anyway :) Feel free to discuss the problems in the comments below; I can outline solutions but I don't have a formal editorial.

• +92

By MikeMirzayanov, 10 years ago, translation,

Not so long ago in the English Wikipedia has been added to the article about Petr Mitrichev (Petr). Currently, there is a discussion of this article for removal due to the lack of significance. Here is a quote from the discussion: "I don't see how Petr is notable in Wikipedia standards. What makes him different from the hundreds or maybe even thousands of others who are on a similar level as him at competitive programming?".

By the way, there is the article about Reid Barton, the outstanding contestant from US. Who is more valuable for the history?

It would be nice if those who is familiar with the rules of Wikipedia, added to the discussion to support Petr.

By the way, the article actually seems incomplete and not disclosing the success of Peter. Maybe someone will undertake to improve?

• +192

By witua, 10 years ago, translation,

Hi!

Tomorrow, January, 22-nd at 11:00 o'clock (Moscow timezone), will have place Codeforces Round #104! The problemsetter will be me, Herasymiv Vitaliy (witua). Thanks a lot to Artem Rakhov (RAD) for help in praparing the problems and Maria Belova (Delinur) for problems translation.

I hope you will like this round.

See you tomorrow!

Points destribution today is:

DIV1: 500-1000-1500-2500-2500

DIV2: 500-1000-1500-2000-2500

Thanks to all, and here are the results:

Division 1:

Division 2:

Here is an editorial.

• +143

By Hohol, 10 years ago, translation,

Hi there. I invite you to participate in my first contest. It will take place in Codeforces::Gym at 19:30 (Moscow timezone — UTC+4).

Problems are rather easy, so it will be more interesting for div2 participants.

Warning: now statements are only in russian. But later we will translate all our trains in english, so everybody will be able to run them in virtual contest mode.

• +62

By MikeMirzayanov, 10 years ago, translation,

Today we open a new project Codeforces::Gym, it will be started on January 19, 08:00AM. 30 minutes later, оn Thursday, January, 19, 2012 08:30 (UTC) the testing training contest will be started. The duration of the training is 3 hours. We invite you to join us! As all the trainings in Codeforces::Gym it will be held according ACM-ICPC rules.

As it will be a training, we will use problems from some programming contest (thank you, authors!). Please do not take part in the training, if you've seen these problems. Do not spoil training to other members. Thank you for your understanding.

Please use the official project tracker to report about bugs and feature requests.

• +22

By Gerald, 10 years ago, translation,

Good day, friends!

Today another Codeforces round for Div2 participants will be. As the last Div2 only round, this round has been prepared by a team of three people: NALPPolichka and Gerald. Traditionally, we express our gratitude for their help to Artem Rakhov (RAD) Maria Belova(Delinurand Mike Mirzayanov (MikeMirzayanov).

Score distribution: 500-1000-1500-2000-2500

Good luck and have fun of solving problems! :)

UPD: Problem analysis