Hello Codeforces,

In less than a two weeks, finals of 8th edition of Bubble Cup will be held in Belgrade, organized by Microsoft Development Center Serbia.

Unfortunately, there wont be Bubble Run contest this year (which was held last two years for university students in the same tame as BCup, and it was a 24h marathon style contest), but only ACM-style 5 hour long contest for both university and high school teams in the same category. You can read more about contest on the official website, and read tasks and solutions from past years in the booklets. (There are some very interesting tasks, especially from Run contests, so I encourge you all to take a look at them).

Usually, the contest was interesting only to teams from Serbia and it's region, but every year we can see more and more teams from other countries participating in qualifications, and now there will be teams from 7 different countries from Eastern Europe participating in the finals, which is the most I think. Certanly, it will be the toughest Bubble Cup ever, and that's the reason why I'm listing teams here. I hope there will be even more strong teams from other countries next year!

The new cool thing this year will be a BC conference where we will hear talks about competitive programming and maybe something more, from Psyho (Psyho), misof and MikeMirzayanov! (I can't wait for this! :D). Also, there will be a big party after the contest as MDCS celebrates 10 years anniversary.

For teams and guests who will come to the finals: Hope you will enjoy Belgrade and Serbia, and if you want to go to some fun places here, hang out, or maybe even spend few more days in this beautiful city, I'll be glad to help you :) If you have any questions, just post it in the comments, or send me a message. See you soon!

Teams (sorted by bonus penalty time):

Hello Codeforces community!

Codeforces Round #318 (for both divisions) will take place on August, 29 at 19:30 MSK. It is the Thanks-Round devoted to Russian Code Cup. You will be given 5 problems and 2 hours to solve them. Scoring will be announced close to the round. I strongly recommend you to read all problems.

RussianCodeCup is the largest open programming competiton for Russian-speaking participants by Mail.Ru Group. Its history started in 2011. And since the first championship RCC offers great problems and generous prizes. This year finals will be held on September, 19th. Wish good luck to all the finalists! Thank you, RussianCodeCup, for your gift on the 5th anniversary of Codeforces!

I am honoured to be a problem setter for this round. I wouldn't do it alone. I want to thank Zlobober for his great help with problems preparation and MikeMirzayanov (and all people working on Codeforces and Polygon) for this awesome site. It's an amazing place to learn and compete. My big thanks to winger and AlexFetisov for their help with testing a round. And to Delinur for translating statements. As you see, not only a setter creates a round.

It's my first Codeforces round but not my first problems here. You can check out A, C and D from VK Cup 2015 — Round 2. Also you might remember some of my problems in TC rounds. I'm very happy with finally preparing a full round for Codeforces and I hope you will enjoy it. I tried my best to prepare nice and diverse problemset, you will judge it. In all problems you will have to help Limak who is quite unusual bear.

I wish you great fun and no frustrating bugs. Looking forward to seeing you!

UPD: Scoring is 500-1000- 1750 -2000-2500 in div1 and 500-1000-1500-2000- 2750 in div2. Enjoy a round!

UPD: Editorial

UPD: Contest is over. The winners:

Div1:

1. Marcin_smu
2. mnbvmar
3. subscriber
4. LoneFox
5. Shef

Div2:

1. cescmentation_folch (5 problems solved!)
2. fhxb520630 (5 problems solved!)
3. bugCollector
4. Sehnsucht
5. okaduki1

And note from an author. There were some wrong solutions passing. Sorry for that. I tried my best to create strong tests but I failed a bit. Did you like this round? What do you think about problems?

Thanks for participating!

Hi, Codeforces!

Codeforces Round 317 will take place on August, 22 at 19:30 MSK.

The round is prepared by AimFund employees: Kostroma, riadwaw, yarrr, gchebanov, ArtDitel, SirShokoladina and zeliboba.

Scoring system will be static.

Thanks to Mike Mirzayanov(MikeMirzayanov) for brilliant platforms Polygon and Codeforces, problem coordinator Max Akhmedov (Zlobober) and Maria Belova (Delinur) for English translation.

Top 200 div1 participants will be awarded t-shirts. To learn more about AimFund please refer to our previous post.

This round is prepared as part of "5 years" Codeforces program as our present to community. This round is the first Thanks-Round devoted to companies donated significant money.

We wish you good luck and high frequency rating!

P.S: scoring 1 div 750-1250-1500-2000-2750. 2 div 500-1000-1750-2250-2500

P.P.S. Top-20 div2 participants will be awarded t-shirts.

Analysis

P.P.P.S. Dear friends. We are pleased to inform you that t shirts delivery will be under way next week. We hope you will really like them. Our sincere congrats again to you all!

GCJ will start in less than 24 hours.

Live Stream: https://www.youtube.com/watch?v=rh_EYIu7Ztc

Unfortunately I don't have time to edit this table, but rowdark will participate, and JoeyWheeler won't.

Participants:

Greetings to the Codeforces community!

Regular Codeforces round #316 for participants from the second division will take place on August 13, 19:30 MSK. Participants from the first division are able to participate out of the contest.

It is my first round on Codeforces. Hope you will enjoy this round.

I want to thank Max Akhmedov (Zlobober) for help with preparation of this round, Maria Belova (Delinur) for translation of statements and Mike Mirzayanov (MikeMirzayanov) for great Codeforces and Polygon systems.

Participants will be given five problems and two hours to solve these problems.

UPD: The score distribution is standard, 500-1000-1500-2000-2500

Good luck!

UPD: Contest is finished. Thank you everyone!

Congratulations to the winners!

UPD Editorial

Hello everyone!

Codeforces Round #315 will take place soon. The authors of this round are students of Ural FU sivukhin and Um_nik. This is our second round. First one was in the black days of Codeforces and we hope that this will not happen again after our round :)

We want to thank Codeforces team for great Codeforces and Polygon platforms and Zlobober for helping us prepare this round.

Good luck!

UPD1:
Score distribution.
div2 : 500-1000-1500-2250-2750
div1 : 500-1000-1500-2250-2500
We strongly recommend you to read all the problems. We try our best to prepare different problems and some problems that hard for us can be easy for you.

UPD2:
Editorial

UPD3:
Congratulations to the winners!

div1:
1. KAN
2. Petr
3. enot110
4. tonyjjw
5. Konijntje

div2:
1. Lost
2. loser21
3. fyiwxp221
4. hqpwca
5. LazyWolfLin

Thank you for participating.

Hello, Codeforces!

5th august 2015 at 19:00 MSK Codeforces Round #Pi will take place for second division participants. Participants from the first division are able to participate out of the contest.

This is my first round on Codeforces. I hope you will enjoy the tasks and this will stimulate me to prepare new rounds! Wish you quick Accepted verdicts and successful hacks.

I want to thank Michael Mirzayanov (MikeMirzayanov) for wonderful platforms Polygon and Codeforces and for help in preparing the tasks, Maxim Akhmedov (Zlobober) for help in contest preparation, Maria Belova for translation statements to english, and also my friends Danil Sagunov (danilka.pro) and Vitaliy Kudasov (kuviman) for solving the tasks.

Participants will be given six tasks and two and the half hours for solving them. Scoring system will be announced closer to round start.

UPD: Scoring: 500-1000-1500-2000-2500-2500.

UPD Editorial

The registrations before 00:00 have been deleted, because the form didn't support teams. Please, register again if your registration has been affected.

VK Cup 2015 Final Round has ended two days ago. It's very likely that you've seen our previous posts. The last event to happen is online mirror of the final round. It will be held on Thursday, July 30th, at 19:00 Moscow time. Individual contestants as well as teams consisting of two people may participate in this round. Round duration is three hours, problems will be shuffled in comparison with to the original order. Both division participants may take part, but we want to warn 2nd division contestants that problemset may be hard for them. This round is a rated Codeforces round.

Finally, we want to thank all people that made this Championship. Following VK developers, Codeforces team members and the other people suggested their help to us while creating and preparing problems: PavelKunyavskiy, burunduk3, Dmitry_Egorov, Kurpilyansky, dark_ai, MikeMirzayanov, Zlobober, MaximShipko, kuviman, Nickolas, Errichto, sankear и malcolm. We want to thank the people that helped us very much by testing our rounds and giving great advices: winger и AlexFetisov. Also we want to say thank you to all VK members that helped us to run the onsite Finals: burunduk3, Burunduk2, KOTEHOK and many others. Thank to all of them!

Good luck and have fun on our Online Mirror!

UPD: Note that during the round the team is allowed to use only one computer. This means that you may code/use console/succeed in solving problems in any other manner by using only one computer at time. The only thing that is allowed from two computers is reading the statements.

UPD2: Since this is a team contest, specially for your convenience we publish the encryped zip-archive with pdf-statements of problems: vkcup2015-mirror-statements.zip. When round starts, we'll publish a password for it.

UPD3: The round will use the dynamic scoring with 250 points step.

UPD4: Due to technical reasons the round starts at 19:20 Moscow time.

UPD5: Password for statements archive: vkcup4ever. Good luck!

UPD6: Online mirror has ended! Congratulations to winners:

1. rng_58
2. Zenith: I_love_Hoang_Yen, ngfam_kongu
3. OrOrZZZ!: zld3794955, KFDong
4. Petr team: Petr, ilyakor
5. jcvb_matthew99: matthew99, jcvb

Also, my personal respects for a team "Petr team: Petr, ilyakor" for only solution for a problem Е in this mirror, user rng_58 and a team "Excited: YuukaKazami, jqdai0815" for two correct solutions for problem С.

Congratulations to a user rng_58 that showed that a single contestant can compete with teams consisting of two people!

Rating will be updated shortly.

UPD7: Editorial!