MikeMirzayanov's blog

By MikeMirzayanov, 16 years ago, translation, In English
I invite you to participate:) Round will be non-rated, but there will not be limited registration at this time! Please, read the rules before the contest!

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By MikeMirzayanov, 16 years ago, translation, In English

You may read complete rules here.

The text contains only preliminary rules of Codeforces contests — something surely will change. In particular, I hope to help the community to find the illogic in the rules. However, I have already discussed the format with programming contests dinosaurs and made unrated alpha contests — it seems rules are OK.

I think than the format 5 tasks x 2 hour is quite good. For this reason, in the near future we will not change it, but of course, experiments are possible.

1. Before the competition all participants are divided into rooms, each room contains about 20 participants. For now random strategy works, but after a while it will be somehow correlated with the rating.

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By MikeMirzayanov, 16 years ago, translation, In English

Hello!

Today will be the first alpha test of the new format of the competition. Registration will be limited - as soon as about 60 participants have register, I'll close it. Invited to participate, only those who have read rules draft. The document is in Russian, so I expect most participants from Russia. After some time we will translate the rules into English, and make this type of rounds really international.

In this round will be used folklore problems and the duration had to be reduced. For sure, it will be non-rated. Codeforces not guarantee that everything will work well - so be patient.

Many thanks to those who gathered to take part. I hope it will be interesting.

MikeMirzayanov

UPD 1. Contest duration changed to be 90 minutes.
UPD 2. In order to take part in contest, your browser should have installed flash player.
UPD 3. Contest will start on 19:30.

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By MikeMirzayanov, 16 years ago, translation, In English

Guess when the contest began and ended :)

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By MikeMirzayanov, 16 years ago, In English
Hello.

Soon my wife will have a business trip to China. She will be a week in Harbin. Is there anyone from this city?

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By MikeMirzayanov, 16 years ago, translation, In English

This post contains few words and many pictures. I decided to publish statistics on Codeforces visitors for the past two months. Why? I believe that it might be interesting. I took pictures from Google Analitycs.

Codeforces was born little more than 4 months ago. During this time, we held 16 contests (though one of them was non-rated). There are more than 4000 registered users, and every day we get about 30 more. There are 1797 coders participated in the contests, many of them participate in our contests regularly. The average number of registrations for one competition is growing, and I want to believe that soon it will conquer psychological barrier 1000 users. Also codeforces social network is popular: more than 400 posts, almost 6000 comments. The leader of the hit parade of posts is this post, has collected to date 184 comments. Bravo, SkidanovAlex! And of course I say thank you to everyone who helped make the project: those who help in the development, who make the problems, translate texts and write the alternative solutions, participate in community life, and just take part in contests. Thank you!

Below you will find a few more pictures and statistics, the total traffic of about 250KB.

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By MikeMirzayanov, 16 years ago, translation, In English

The first information letter


General information


From 2nd to 12th August 2010 Saratov State University runs an international student summer school in computer programming. Teams of three people and individual participants are invited to take part in it.

The school will take place in a picturesque place at one of Saratov resort centers on the Volga bank. The participants will be provided comfortable rooms for 2-4 people and meals three times a day. The resort center owns a beach and sport grounds.

The school curriculum includes lectures by Saratov state university coaches, joint trainings, problems tutorials and topical workshops. The curriculum is designed for younger university students who aspire to achieve high results at programming competitions.

The fees are 15000 RUR (~ 500 USD) for a person. Moreover, each team or an individual participant should bring a laptop with the support of WI-FI.

All interested participants and teams should register at http://acm.sgu.ru/sazanka-2010/ till 10th June 2010. Don't postpone the registration, as the number of participants we can take is limited.

You can get additional information by e-mail mirzayanovmr[symbol-at]gmail.com. As since the official language of the school is Russian, the registration requires knowledge of Russian. Also it is recommended to view this page in Russian.

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By MikeMirzayanov, 16 years ago, translation, In English
Today's round is not quite usual. The participants of the first division can register on it and to participate out of competition. This round will be some alpha-testing for this functionality, but for the next div. 2 round you can expect a stable version. 

This round prepared for you by: homo_sapiensJuliaNerevarKudryashovIA and me. 

I want a high-ranking 
MikeMirzayanov

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By MikeMirzayanov, 16 years ago, translation, In English
There is known issue which sometimes leads to the fact that with the start of contest we have to restart the application (the same goes for the end of the contest). Please do not panic if it happens. In worst cases it will take 2-3 minutes. I’m resolving this issue, but at the moment it is not yet completely resolved. Thank you for your understanding.

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By MikeMirzayanov, 16 years ago, In English
Hello again. I hope nobody has forgotten to register?

In this contest we will try alpha of our chat - if something goes wrong, we turn it off: please do not panic:)

Links:
Problemsetters: Дмитрий Матов и Игорь Кудряшов. Thank them for their contributions.

I wish you to advance to the first division.
Mike Mirzayanov.

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By MikeMirzayanov, 16 years ago, translation, In English
Sometimes funny things happen on contests. On a recent training Ivan Fefer was unsuccessfully submitting one of the problems for a long time. After all he asked me. There followed this dialogue:
Ivan: - I have a question on the problem D.
Me: - What is the problem?
Ivan: - It is about a tree and requests.
Me: - So it's C.
Ivan: - ...oops... The question is removed ...

Do you have a funny story about something that happened to you during the contests?"

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By MikeMirzayanov, 16 years ago, translation, In English
Welcome to Codeforces Beta Round # 9. 
The problems of this round prepared by Alex_KPR. Thank you, Alex_KPR. Also Nerevar participated in the contest preparation.

Julia, a special thanks to you for the excellent translations.

Wish you high rating,
MikeMirzayanov

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By MikeMirzayanov, 16 years ago, translation, In English
In case you are not familiar with the term, this the way of filling the site with content by the joint effort of the community. You might read a Wikipedia entry.
Basically, the idea to apply crowdsourcing to contests tutorials seems quite natural, but… it works badly. As you see, it is not the first time there has been no one willing to help the community. The question is: why and what is the way-out?

Let’s discuss it together. What should be changed/improved in order to make contests tutorials appear at Codeforces?

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By MikeMirzayanov, 16 years ago, In English
Welcome and good luck on the round! 

I'd like to remind that if you have any questions on the problems, the best way to ask them is to use the web interface on the problems page. 

Later in the same post we will discuss the round. 

Wish you high rating,
MikeMirzayanov.

UPD. For contest you may thanks team Saratov SU #5, namely, users FeferGerald and Polichka.

UPD2. And better late than never: the presence of English statements we are obliged only to Julia. Many thanks to her for 8 wonderful translations of 8 rounds.

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Announcement of Codeforces Beta Round 8
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By MikeMirzayanov, 16 years ago, translation, In English
The contest is rescheduled to start on 19:45.

Thank you all for participating in Codeforces Beta Round #7. I hope you enjoyed it. You may discuss the problems and system in comments. Please express your opinion, especially if you notice any inappropriate behavior. And as always, I will read with interest the suggestions for improvement.

From today on both-divisions contests ratings will be updated separately for each division. I. e. ratings will be calculated as if two contests (one per division) have taken place on the same problemset.

Also I would like to see someone who wants to write contest tutorial. This must be done in Russian and English languages. Of course you must solve the problem on either contest, or in the practice. If you have a desire to do it - write in comments. Your post will be published on the main page and later available on special link available from the contest page.

Many thanks to the contest problemssetters: RAD and e-maxx.

Good luck.

Ratings has been updated. Solutions are available for view.

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Announcement of Codeforces Beta Round 7
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By MikeMirzayanov, 16 years ago, translation, In English
Welcome to the Codeforces Beta Round #6.

It will be good to see your feedback and impressions in the comments.

Wish you high rating,
MikeMirzayanov.

UPD. It seems the problem D has some tricky issues around judge solutions. Judge solutions will be fixed and the problem will be rejudged. If it will affect many participants, the contest will not be rated.

UPD 2. We have reduced constraints in the problem D and made rejudge. No solution passed tests. So the rejudge affected significantly only 4 participants, who solved it during the contest. But all of them increase their rating if we will count the contest as rated event. So we decided to make it rated and put problem with lowered constraints into the practice.

UPD 3. And by the way, the round tutorial is waiting for a volunteer. The tutorial should be in Russian and in English. It will be published on the homepage and later will be available via special link from the contest page.

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By MikeMirzayanov, 16 years ago, translation, In English
Hello to everyone.

The latest news - now you are able to see the source code of the solution. During the contest you can view your own solutions only, but when the contest is finished you can view the solutions of any other participant. The table with the solutions is available via the problemset page, the solutions there are sorted by the program length. Pay attention, please, that you are free to change the sorting criteria using the option at the bottom of the table. 
There is another principle that gives you the chance to view the source codes of solved (during the contest or practice) solutions only. Personally, I regard the principle "everyone sees everything" as more suitable for our regular contests.  Am I right?

When you run a contest within your private community, you'll be able to set up your own principle for viewing solutions (or to switch off this function at all). But this functionality is under construction now. 

Wish you high rating,
MikeMirzayanov

UPD. Standings page is improved. You may double-click into a table cell (or use Ctrl+click) to view the submissions history.

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By MikeMirzayanov, 16 years ago, translation, In English
Welcome and good luck on the round! 

I'd like to remind that if you have any questions on the problems, the best way to ask them is to use the web interface on the problems page. 

Later in the same post we will discuss the round. 

Wish you high rating,
MikeMirzayanov.

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Announcement of Codeforces Beta Round 5
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