Hello.

Now you can create teams and invite other users Codeforces. I remind you that the first distance Winter Computer School Olympiad will be for teams, and for official participation in it only teams will be allowed (all team members should be registered to the serie).

P.S. It is only the first version of the teams interface. We are working on extending it. Suggestions are welcome.

Greetings to everybody.

Today is an unusual day on Codeforces: two contests a day with quite small gap between them. The reason is that today the IX Regional team school programming contest is held in Saratov, and it was decided to use the tasks from it for Codeforces rounds.

That's why there are many authors of today's tasks. I would like to thank the whole jury of the school contest for their excellent job. The following people are on the jury: Artem Rakhov, Nickolay Kuznetsov, Natalia Bondarenko, Gerald Agapov, Polina Bondarenko, Ivan Fefer, Edvard Davtyan, Igor Kudryashov, Pavel Kholkin and me. I believe that you know all these people as Codeforces problemsetters.

Let me draw your attention to the fact that today all problems have file IO. But generators for the hacks should output to stdout as usual.

Special thanks to Maria Belova and Julia Satushina for translating problem statements into English.

Good luck at the contests!

UPD: Results of the 35th round. We congratulate the winner, Naginchik, on his impressive debut!

UPD: Results of the 36th round.

Links to problem tutorials: A, B, C, D, E.

Saratov State University in announcing Southern Subregional Programming Contest 2010. It will be held from the 19th to the 23rd of October.

For the right to reach the Regional Contest will be competing universities of Astrakhan, Volgograd, Voronezh, Nizhny Novgorod, Penza, Rostov, Samara, Saratov, Tambov, Ulyanovsk, Krasnodar and Stavropol regions and from the republics of Adygea, Mari El, Mordovia, North Ossetia, Tatarstan. Totally 63 teams will participate in the competition.

In addition, on 19th October will be held IX Regional Team Highschool Olympiad, which is a qualifying stage for the All-Russian Team Olympiad in Informatics for schoolchildren. The top five school teams will win the right to participate in the final stage of the Olympiad.

On the official website http://contest.sgu.ru/ you can view the results during the competition.

For the fifth consecutive year, except for official competition, teams are invited to an informal entertaining contest Code Game Challenge. Under Code Game Challenge teams will write programs that will be placed in the simulation game world, to directly compete with other participants! Teams will be given specifications for a game object. These specifications will include a set of interfaces to be implemented and a goal for the object to achieve when in competition with other team's objects. Capabilities include observation of the progress of other team's objects and measures that can be taken to block that progress. The winning team object will be determined in a game environment while competing with others.

On 23rd, October at 07:00 (UTC) on the site http://acm.sgu.ru/ will be held an online contest on the subregional contest tasks. The official onsite standings will be integrated to the online ranklist!

Good luck!
MikeMirzayanov

Good day!

Winter Computer School is announcing a series of team and individual programming contests for schoolchildren. This school is organized by the Moscow Institute of Physics and Technology and sponsored by Yandex and ABBYY. The contests will be help on the Codeforces platform.

The series will consists of three team and the individual competitions. We invite schoolchildren (students enrolled at a school for secondary education) from the Russian Federation and other countries to take part.

The jury is already actively working on. All the competitions will include a wide range of problems and it will be useful and interesting for both beginners and experienced participants.

The winners will receive certificates and prizes!

The first contest is for teams and will be held on October 24 at 07:00 (UTC). The duration of the contest is 5 hours.

The full schedule (UTC times are given):

To participate in contests (as in team and individual) you must have an individual account at Codeforces. Attention! Do not register accounts for the teams, because after a few days it will be announced a new features to organize teams from registered Codeforces users.

All ongoing competitions will be open for informal participation for students and other Codeforces users, who do not participate in the official standings.

We hope that these Olympics will help you tighten up your knowledge of programming and help to prepare for the upcoming Olympiads – All-Russian Team Olympiad, All-Russian Olympiad and other competitions.

To become a member please register on a series of competitions. Here is the complete list of registrants.

Register now!

P.S. I should add that the Codeforces project has prepared a special award for the best participant!

Good luck to all participants,
MikeMirzayanov and the Jury Team

UPD. An interface to create teams is available.

Welcome all to the next Codeforces Format round!

In this round I will replace Artem Rakhov in his usual role of contest administrator: Artem have set out to America to take part in TopCoder Open Algorithm onsite. Good luck, Artem!

The contest has ended, results.

User a4461497 has won the contest, while among first-division users - kuniavski was the first who solved all 5 problems.

Attention, participants from the Division 1! As a test feature, you can participate in Codeforces Beta Round #32 "out of competition".

Everybody knows, that the 2nd of October - birthday of Mohandas Gandhi. We dedicate today's round to him, and many other great people who were born on October 2 :)

Round was prepared by Mike Mirzayanov, Matov Dmitry and Max Ivanov.

Special thanks to Julia Satushina for translation of statements.

Good luck!

Artem Rakhov and Codeforces team

What can be better than good news? Right you are - excellent news. The news I'm going to share with you is such.

We're glad to tell you, that VK company is now the primary sponsor of Codeforces project! It's a great honor for us - because VK is not only the largest social network in Russia and one of the largest in the world, it's also an example of a high-tech, innovative approach and dynamic development.

VK's help will allow us to continue the development of the platform, to run interesting contests for you on a regular basis. We have ambitious plans to fill Codeforces with useful educational content.

It's also important for us, that Codeforces programming contests community attracts not only its makers and participants.

"Codeforces contributes a lot into the development of collegiate programming in Russia. I'm glad that we have a chance to support this project. I hope it becomes even more interesting to participate in and win Codeforces contests", - says Pavel Durov.

"A powerful developers team is the main driving force of our company. It's at contests, like Codeforces, where we find young and talented programmers, who can solve difficult technical tasks", - added Andrey Rogozov, the head of VK development department.

Wish you high rating,
Mike Mirzayanov