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.

In addition, we improved typography posts and comments.

See description Markdown using the links:

• http://en.wikipedia.org/wiki/Markdown
• http://daringfireball.net/projects/markdown/syntax
• http://bywordapp.com/markdown/syntax.html

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;
5. headers;
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

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!

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?

Comments?

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.

We've made it! Or in any case, we are at least very close to it.

On January 19, 2012 at 12:00 we open a sub-project called "Gym". In short, its goal is to enable the Codeforces coders not only to participate in competitions and discuss them, but also to train and coach easily.

In fact, despite the wide diversity of online judges in the world, a well thought-out training service system does not exist. So, the expectations from this system are:

1. Collection of online contests, composed mainly of the past official contests.
2. Opportunity to integrate the final standings of past contests in the online contests to be able to train "against" the official participants.
3. Opportunity to participate in the training at any time whatsoever, without fear that something breaks down and the server will fall. In short, reliability.
4. Opportunity to write virtual contests and to solve the problems in a practice mode.
5. Opportunity to participate both individually and as part of a team.
6. Opportunity to keep the team while changing the team members.
7. Opportunity to view various statistics and participation history, the possibility to compile and publish reports on selected participants/contest.
8. Opportunity for a coach to add an online contest by him/herself, if this contest still does not exist. The process should be simple, reliable and maximally automated. The opportunity to parse the final standings of the past contests. The opportunity to add the attempts of the official participants to an online contest.
9. Opportunity to view tests or other players' solutions for those who have solved the problem.
10. Opportunity to find the training to one's taste, i.e. selecting by parameters.

The Codeforces Project:: The training aims to meet all these requirements. Already, nearly everything of the above list is available and whatever is not, will be available.

Hi everybody.

This change will not probably be among the most popular ones but nevertheless, vote counting rules and voting rules in general are going to change. Why? There are several reasons. The main is that we decided to give up the +2/-1 strategy that used to favor authors. This balance worked fine in the Coderofces's initial stage of development. However, it now leads to overrating many uninformative posts. Moreover, such rating is not valid. Thus, a positive vote and a negative vote now have the same value and the total rating sign now represents the actual attitude of the community members to the post or a comment.

Also, as Codeforces is a professional community of those who is interested in sports programming, it was decided to consider the participants' professional achievements. Thus, the value of a participant's vote now is delapnds on the participant's authority and the authority is determined by the rating. At this point I have to mention that the participant's authority is not influenced by his/her contribution. The votes' values do not differ dramatically: despite the fact that the red participants are 15+ times less that the blue ones, their votes' values differ less than their numbers.

We've introduced additional fraud detection heuristics (some of them had been used on Codeforces). These new strategies make it impossible to cheat in various ways or carry out a grudge, they make reverse engineering systems more complicated and influence some other stuff now and then. The exact details of the vote counting rules are not disclosed but the main principles are given above.

Of course, the change in vote counting will trigger considerable changes in some participants' contributions. I guess that's the indicator of the character of the votes' distribution and the voters' authority. All votes will be recounted that will lead to change in contribution.

MikeMirzayanov

Hello

We've scheduled Codeforces Testing Round #4 on January, 3 15:00 (UTC). It will be non-rated event, just to test system before important Codeforces Round #100. The round duration is 1 hour and it will contain just two problems. I do not promise something interesting and exciting, but as a small warm-up will be nice :)

I'll be glad to see you on the round,
MikeMirzayanov

The testing is successfully completed. Thank you for participation. I hope you like this sprint.

Codeforces project congratulates everybody who is into sport programming with New Year! A New Year is not just an increment of a year. Let this day be a starting point to your new achievements, accomplishments and success. Codeforces wishes you to find out by the end of 2012 that all your resolutions have been a success! We wish you to have interesting problems, nice solutions, correct code and more and more of beautiful green messages  Accepted.

As well as in the previous year, we enable handle change for ten days. The handle change is available from the "Settings → Handle" tab from your profile page. Handle change will be disabled on January 10, so don't lose the moment!

Happy New Year, Happy New Coding!
MikeMirzayanov

Hi everybody!

The calendar shows the end of December — the year 2011 is about to end. It was an eventful and exciting time for us. You can find pictures below summarizing 2011 in comparison to 2010. In a nutshell, we've made it! We have grown in all parameters! This result is the shared victory of the well-united team. My special thanks go to the VK (VKontakte) and specifically — to Pavel Durov. The programmers' community and its development really matters to them. I want to thank the authors of the problems: preparing contests is tough and you are a significant help to the Codeforces project and to the whole community.

So, comparing the ending 2011 year and the 2010 year in pictures goes like this:

Codeforces users' growth throughout the Codeforces history (by months)

Hello, everybody.

New Year Holiday is a time of miracles and gifts! Quite by chance the 100th Codeforces round coincided with this wonderful moment.

So, January 4 at 15:00 (UTC) the anniversary Codeforces Round 100 will have place. Yes, we say goodbye to the word Beta in round titles :)

It will be a combined round, that is, participants Div1, Div2 and newcomers will compete with one set of problems. To make it interesting for each participant we plan to expand the round to 6 problems.

The most important thing: the best hundred participants of the 100th round will receive an exclusive Codeforces t-shirt!

Happy new year!
Codeforces Team

Informal unrated contest Codeforces Testing Round #3 is scheduled on December, 2 (Friday), 15:00 (UTC). We will test the latest innovations on Codeforces that they do not affect the contests. If not, we will fix it quickly :) So, this round will take place "as is", no warranty about it.

Problems for the round may be famous to someone, but I'll try to make them such not for any of you. It will be 3-4 problems, as quite simple and something more tricky. The contest duratiuon is 1 hour.

I say thanks in advance to all those who will come and test the system. Thank you!

The ACM-ICPC Northeastern European Regional Contest 2011 is over. Congratulations to the winners! I especially want to mention the team that will represent our region on the World Finals in Warsaw:

1. SPb NRU ITMO 1 (Kapun, Kever, Nigmatullin) — 1-st place, champions
2. Moscow SU 1 (Fedorov, Kaluzhin, Rogulenko) — 2-nd place
3. Belarusian SU 1 (Bahdanau, Pisarchyk, Sobol) — 3-rd place
4. Saratov SU 2 (Ivanov, Kuznetsov, Rakhov)
5. SPb SU 1 (Andreev, Boykiy, Fondaratov)
6. Moscow IPT 1 (Dlugach, Gimadeev, Shishkin)
7. Ural FU 1 (Dolgorukov, Schelkonogov, Soboleva)
8. Altai STU 1 (Silin, Uvarov, Yesipenko)
9. Ufa SATU (Lezhankin, Mazgarov, Ripatti)
10. Nizhny Novgorod SU (Lyulkov, Shmelev, Vadimov)
11. Belarus SUIR 2 (Berezhnov, Brukau, Ropan)
12. Udmurt SU (Abizyaev, Kibardin, Urbanovich)
13. Latvian U 2 (Kalinicenko, Vihrovs, Vilcins)
14. Kazakh-British TU 3 (Aitbayev, Satylkhanov, Almakhan)
15. Tomsk SU 1 (Chadnov, Kolupaev, Afanasev)
16. Volgograd STU (Agafonov, Chalyshev, Zhorin)

Codeforces wishes all future World Finals participants the success in preparing for the competition and good results in the final!

Hello!

On Friday, November 25 at 19:00 I'm waiting you on the Codeforces Beta Round #95 (Div. 2). This round is prepared by me. It is not easy to prepare a round, but it is always useful and interesting. By my example, I want to hint to top participants that rounds of famous people — it's always interesting!

Apart from me RAD, Nickolas and Delinur were doing work on the round. Moreover, Edvard still do not know, but very soon I will ask him to solve this round as a tester:)

It will be unusual round because you will find six problems. It's a little experiment — I hope that it will help each participant to find interesting problems to themselves.

I believe that the out-of-competition participants from Div.1 will have some fun solving the round.

The problem scoring is: A - 500, B - 1000, C - 1500, D - 2000, E - 2500 and F - 2500.

Good luck!

MikeMirzayanov

UPD. The competition has ended. Here are the results. First place was taken by the representative of China — liuq901. Congrats! It was nice to see such interest to the contest. Thank you for your participation!

Unfortunately, I do not have the opportunity to write a tutorial. If you deal with it I will be grateful.

Hello.

I want to share a great joy of my family. On the night of the 8th to 9th November, a little girl named Tanya Mirzayanova was born. Of course, now the reasons of round shifting are obvious :)

While Tanya less than a day from the birth, but she has gave great impressions of joy to her parents — me and my wife Kate aka LLLike. And how many more to come!

A few years later Tanya Mirzayanovа will read this post, and I'll tell her: "Look Tanya, how many good and intelligent people from different corners of the Earth congratulate you!" :)

Happy and contented,
MikeMirzayanov

UPD: Thank you all for your congratulations! I did not expect to read so many warm and wonderful comments. A number of pluses proves the eternal truth: "Children are flowers of life". Thank you!

Hello!

Today is November 7th. And this, as you probably know, is a very special day for many ex-USSR citizens. Many years ago on this day the Great October Socialist Revolution happened. I still remember red flags and military equipment on the avenue and the feeling of common joy and holiday. But today, in 2011, we have another revolution — the Codeforces revolution of colors and titles. Hooray!

So, over the last few months our community has grown significantly. If we count the users who have participated in the rated contests over the last 9 months at least once, at the beginning of the year they were 4330, and now — 7615. This is a great step forward! Of course, this leads to a dramatic rating inflation. Most of the ELO-like ratings have the same issue. For example, only A. Karpov had Elo chess rating of more than 2700 in 1979; however, there were as much as 15 people with such rating in 1994, and in 2009 they were 33. In 2001 there were less than 10 red players on TopCoder; in 2005 they were about a hundred and now — more than 250.

A similar effect occurred on Codeforces. It is particularly striking as it is accompanied by a marked audience growth. For this reason it was decided to change the color system . In addition, the record shows that not all participants liked the military ranks. Besides, they are quite far from our intellectual and sporting spirit. Today we will disband Codeforces as a military unit and introduce sport titles. We've mostly used the titles from intellectual sport games to work out the following classification:

In addition, the rating recalculating formula was slightly fixed to slow down the inflation. Now the sum of ratings will not be the constant, but is likely to be slightly falling. In fact, the changes are cosmetic and will be visible only on a series of contests.

I understand that for some of you it will be hard to say good bye to the favorite color, but let's look ahead with optimism — new victories will bring the lost color back color and help to win the proud title of a Grandmaster!

MikeMirzayanov

Hello!

Informal contest Codeforces Testing Round #2 is scheduled on 10/29/2011 01:00PM (UTC). We will test the latest innovations on Codeforces that they do not affect the contests. If not, we will fix it quickly :) So, this round will take place "as is", no warranty about it.

Problems for the round may be famous to someone, but I'll try to make them such not for any of you. It will be about 4 problems, as quite simple and something more tricky.

I say thanks in advance to all those who will come and test the system. Thank you!

The contest moved to start on 10/29/2011 01:00PM (UTC) (it has been announced to start on other time, be careful).

It will be unrated round.

Thank you all for your help. I think it turned out pretty fun for you and useful for us!

Hello!

Today, October 23 (Sunday) at 08:00 (UTC) will begin online contest based on recently completed ACM-ICPC NEERC Southern Subregional Programming Contest 2011. Two days ago a competition was held in Saratov (hosted by Saratov State University), but today you can participate in it informally. Onsite participants will in the standings, to give you an oppotunity to compare your results with onsite teams. The statements will be available as a PDF-file and in HTML. To participate, go to the site http://acm.sgu.ru.

After the contest, you may discuss here the problems. I hope you'll like them.

Chairman of the Jury,
MikeMirzayanov