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!

Hey everyone,

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?

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:

1. tourist
2. dzhulgakov
3. PavelKunyavskiy
4. wuzhengkai
5. shangjingbo
6. ilyakor
7. Gerald

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.

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.

Good day, friends!

UPD: Problem analysis

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

Hi there!

I'm the author of today's CF round.

During the round you'll again assist far away kingdom citizens in solving their everyday problems.

I want to thank Artem Rakhov for invaluable help during the round preparation, Maria Belova for translation of the problems, Mikhail Mirzayanov for excellent CF system and all participants for not leaving this event without your attention.

More AC verdicts and high rating to all of you! gl & hf