By NALP, 7 years ago, translation, In English,
Hello everybody.

I would like to invite you to participate in a new competition, that will be held on the 30th of October at 16:00 MSK. It will be a part of the series of winter programming school olympiads, but it will be only a standart Codeforces round for adult participants.

Teams aren't invited, only single members. The official rules will be ACM-ICPC.
Jury has decided to increase the duration of the competition, which will be 4 hours long.

Attention: People, who are considered out of competition, are participants of Codeforces Round #38, others are participants of School Personal Contest #1. But we will use merged result table for updating rating.

The authors are me, Mike Mirzayanov and Artem Rakhov. Also I'm expressing gratitude to Maria Belova, Max Ivanov and Natalia Bondarenko for help.

P.S. Please, don't forget to register to the competition!

UPD: The contest has finished, thanks to all. I hope, you have got fun :)

Congratulations to tourist. It tooks him ~2 hours to solve all problems!

The next official school contest will be on November, 6, at 14.00 MSK

Total number of participants is 788, 274 of them have taken part in the school competition.

Read more »

  • Vote: I like it  
  • +41
  • Vote: I do not like it  

By vepifanov, 7 years ago, translation, In English,
Good evening!

Today I am the author of problems. I'm studying in Nizhny Novgorod State University (2 year, Mechanics and Mathematics). I want to thank the staff codeforces for assistance in preparing the contest, and, personally, Artem Rakhov and Maria Belova (for translations of problems into English). Also special thanks to Alexei Shmelev (NNSU) for writing alternative solutions.

P.S. Unfortunately, this round could be in error to register a team. For teams participating in this round will be counted "out of competition", ie, rating of participants does not change. If you register a team by mistake, you can unregister and register in person.

UPD: After the contest start, it will be available PDF-versions of the statements:
UPD: The contest is over, congratulate Ivan Popelyshev, who won this round. He was the only one who has successfully solved all five problems.

Link to results.

UPD: Tutorials are available.

Vladislav Yepifanov.
На латинице

Read more »

Announcement of Codeforces Beta Round #37
  • Vote: I like it  
  • +79
  • Vote: I do not like it  

By natalia, 7 years ago, In English,
Good day to everybody!

Welcome to School Team Contest #1 that will be held on the 24th of October at 11:00 MSK. The contest will be official for school teams as a part of the series of winter programming school olympiads (, and it will be informal (and not rated!) contest for everyone else.

To compete officially, each participant of a school team must at first register personally, then you must create a team of registered participants, and when registration to the contest opens, you must register your team there too.

I hope that the problems will be interesting for school students with different level of programming skills, and not only for school students! Pay attention to some differences from usual Codeforces contests. First, the duration of the contest is 5 hours, and there will be standard ACM rules. Second, problems will not be sorted in increasing order by their complexity, they will be shuffled. So your first problem for you is to find an easy problem :)

The authors of the problems are Mikhail Mirzayanov and me. Thanks to Gerald Agapov, Polina Bondarenko and Artem Rakhov, who helped me to prepare the round. Also thanks to Maria Belova for translating problem statements into English. We all are from Saratov State University.

Good luck!
UPD: After the contest start, it will be available PDF-versions of the statements:
UPD: The contest is over. The results are available. The winner in both official and non-official standings is Gennady Korotkevich, who has solved all the problems. Congratulations to the winner! The problem analysis is available.

Read more »

  • Vote: I like it  
  • +29
  • Vote: I do not like it  

By MikeMirzayanov, 7 years ago, translation, In English,


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.

Read more »

  • Vote: I like it  
  • +9
  • Vote: I do not like it  

By Nerevar, 7 years ago, translation, In English,

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.

Read more »

Announcement of Codeforces Beta Round #36
  • Vote: I like it  
  • +27
  • Vote: I do not like it  

By MikeMirzayanov, 7 years ago, translation, In English,

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 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 will be held an online contest on the subregional contest tasks. The official onsite standings will be integrated to the online ranklist!

Good luck!

Read more »

  • Vote: I like it  
  • +15
  • Vote: I do not like it  

By MikeMirzayanov, 7 years ago, translation, In English,

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):

The first team contest

October, 24 (Sunday), 07:00

5 hours

The first individual contest

October, 30 (Saturday), 12:00

3 hours

The second team contest

November, 6 (Saturday), 11:00

5 hours

The third team contest

November, 13 (Saturday), 11:00

5 hours

The second individual contest

December, 5 (Sunday), 08:00

3 hours

The third individual contest

December, 12 (Sunday), 08:00

3 hours

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.

Read more »

  • Vote: I like it  
  • +8
  • Vote: I do not like it  

By e-maxx, 7 years ago, translation, In English,

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.

Read more »

  • Vote: I like it  
  • +46
  • Vote: I do not like it  

By HolkinPV, 7 years ago, translation, In English,
Good morning, day, evening, night to you.

Welcome to the wonderful randomized contest, which is prepared for you by team Saratov SU 3 (Davtyan Edvard, Kholkin Pavel, Kudryashov Igor).

Thanks to Julia Satushina, Artem Rakhov and Dmitry Matov for their help in preparing this round. Special thanks to VK company.

Good luck and high rating!
With best regards, Saratov SU 3.

Read more »

  • Vote: I like it  
  • +41
  • Vote: I do not like it  

By MikeMirzayanov, 7 years ago, translation, In English,
Pay attention that on the "Contests" page the October schedule is available. Key dates are:
  • Oct. 7 - Codeforces Beta Round #33
  • Oct. 11 - Codeforces Beta Round #34 (Div. 2)
  • Oct. 19 - Codeforces Beta Round #35 (Div. 2) and Codeforces Beta Round #36
  • Oct. 25 - Codeforces Beta Round #37
  • Oct. 30 - Codeforces Beta Round #38 (ACM-ICPC Rules)
Now from the contests page you can go directly to the link to to see the beginning of a contest in your time zone

Look for updates - it can be changed and widen.

Wish you high rating,
MikeMirzayanov and the Codeforces team

Read more »

  • Vote: I like it  
  • +52
  • Vote: I do not like it