Bubble Cup 17 is officially over. Congratulations to this year's Bubble Cup winners:

Premier League

• 1^st place BenGIIn Klub
• 2^nd place stefanbalaz2
• 3^rd place Urke.

Rising Stars

• 1^st place 100011
• 2^nd place Gimnazija Sombor
• 3^rd place Kisela voda

Here you can find the full scoreboards for Premier League and Rising Stars.

You can also check out the all the problems from this years finals and try to solve them before booklet is published here.

Thanks,
Bubble Cup Crew

Bubble Cup 17 Qualifications are starting soon (May 24th at 2 PM CET). Test Round will start on May 21st at 2PM CET. Take your time to go through the Rules while waiting for competition to start.

The Final round for both Premier League and Rising Stars, will be held in person in Belgrade during scheduled for September/October timeframe. Exact date announcement will be made during month of July.

Thanks,
Bubble Cup Crew

Bubble Cup 16 is officially over. Congratulations to this year's Bubble Cup winners:

Premier League

• 1^st place Infinity
• 2^nd place BenGIIn Klub
• 3^rd place 10^9 + 7

Rising Stars

• 1^st place old folder
• 2^nd place Gimnazija Sombor
• 3^rd place GPT-8

Here you can find the full scoreboards for Premier League and Rising Stars.

Thanks,
Bubble Cup Crew

Bubble Cup 16 finals will be held on September 23rd in Belgrade. Test round will be organized in Belgrade a day earlier.

Detailed info regarding the finals has been sent to Bubble Cup 16 finalists. If you have qualified for the finals and haven't received the e-mail please contact us at: bbcfinals@petlja.org

Thank you,
Bubble Cup Crew

Qualifications are closed!

Here is the list of teams that have qualified for this year's Bubble Cup Finals:

• Premier League

• Rising Stars

Thank you,
Bubble Cup Crew

Bubble Cup Qualifying round has just started! Register your team by June 1st. Qualifying round will be open until June 8th at 14:00 CET.

Please note that due to limitations in material and award delivery, Bubble Cup 16 will be exclusively held for competitors from Serbia this year. The Final round for both Premier League and Rising Stars, will be organized in-person. We hope that we will be able to organize international competition next year.

Good luck!
Bubble Cup Crew

There were some issues with the test round which are fixed now. All your previous submissions on the test round are unfortunately lost.

Sorry for the inconvenience,
Bubble Cup Crew

Bubble Cup 16 Qualifications are starting soon (May 8th at 2 PM CET) and Test Round is already open. Please note that due to limitations in material and award delivery, Bubble Cup 16 will be exclusively held for competitors from Serbia this year.

The Final round for both Premier League and Rising Stars, will be organized in-person.

Thanks,
Bubble Cup Crew

Bubble Cup 15 is officially over. Congratulations to this year's Bubble Cup winners:

Premier League

• 1^st place RAF Penguins
• 2^nd place stefanbalaz2
• 3^rd place Seniori

Rising Stars

• 1^st place hgsafdshsdf
• 2^nd place new folder
• 3^rd place 100011

Here you can find full scoreboard for Premier League and Rising Stars.

Thanks,

Bubble Cup Crew

The Bubble Cup 15 Finals will be organized in Belgrade on September 24th. More details will be sent out to the finalists in the following month.

Thank you,
Bubble Cup Crew

Dear all,

Qualifications are now over!

Here is the list of finalists that will have the chance to show off their skills on the finals:

• Premier League

• Rising Stars

Thank you,
Bubble Cup Crew

Checker for problem "Advanced Battleships" had a bug. Regrading of all submitted solutions for this problem has finished.

Sorry,

Bubble Cup Crew

Dear contestants,

Bubble Cup Qualifying round has just started! Create a team, collaborate, and start solving problems early to increase your chance of qualifying for the Bubble Cup Finals. Register your team by May 30th. Qualifying round will be open until June 6th at 14:00 CET.

Please note that due to the inability to send materials and awards to teams in several countries our competitors are coming from, Bubble Cup 15 will this year be held only locally for the competitors in Serbia. The Final round for teams in Serbia, for both Premier League and Rising Stars, will be organized in-person.

Good luck,

Bubble Cup Crew

Bubble Cup 15 Qualifications are starting soon (May 6th at 2 pm CET) and Test Round is already opened. Please note that due to the inability to send materials and awards to teams in several countries our competitors are coming from, Bubble Cup 15 will this year be held only locally for the competitors in Serbia.

The Final round for teams in Serbia, for both Premier League and Rising Stars, will be organized in-person.

Thanks,

Bubble Cup Crew

Bubble Cup 14 is now officially over. Congratulations to this year's Bubble Cup winners:

Premier League

• 1^st place I want in house dva [new edition]
• 2^nd place Los Estribos
• 3^rd place мучка ђубрад

Rising Stars

• 1^st place nzm
• 2^nd place JaSamMerlin
• 3^rd place ivocaP

Here you can find full scoreboard for Premier League and Rising Stars.

Thanks,

Bubble Cup Crew

Dear all,

Bubble Cup 14 finals will happen on October 9th, 2021 in online format.
Duration of the competition will be 4h, starting at 10am CEST and ending at 2pm CEST. Scoreboard will be frozen in the last 45 minutes.
Competition will be followed by a ceremonial program, which will start at 3.30pm CEST.

Thank you and stay safe,
Bubble Cup Crew

Dear all,

Qualifications are now over!

Here is the list of finalists that will have the chance to show off their skills on the finals:

• Premier League

• Rising Stars

Thank you and stay safe,
Bubble Cup Crew

Checkers for problems "Recurrence Power Sum" and "Sabotage" had a bug. Regrading of all submitted solutions for these problems has finished.

Sorry,

Bubble Cup Crew

Dear contestants,

Bubble Cup Qualifying round has just started!

Create a team, collaborate and start solving problems early to increase your chance of qualifying for the Bubble Cup Finals.

Just a reminder, the Qualifying round lasts until June 1^st 14:00 CET.

Good luck!

Bubble Cup Crew

Bubble Cup 13 is now officially over. Congratulations to this year's Bubble Cup winners:

Premier League

• 1^st place Lar Estribar
• 2^nd place I want in house dva
• 3^rd place [KhNURE] Energy is not over

Rising Stars

• 1^st place Infinity
• 2^nd place Ⱎ Ⱞ Ⰹ
• 3^rd place iUbise

Here you can find full scoreboard for Premier League and Rising Stars.

Thanks,

Bubble Cup Crew

Dear participants,

Hope you're all safe and well. As we've already informed you, given the current situation, the Bubble Cup finals will be fully digital this year. We will be sharing more information about the program very soon, but meanwhile save the date for October 4th, the competition will start at 11 am CEST and the ceremonial program will start at 5 pm CEST.

Here's more about the rules this year:

Given the current situation we want everyone to be safe and enjoy the Bubble Cup finals from their home and that's why team members will be allowed to work on different machines.
Since your team will be able to work on the tasks in parallel, the competition time will be shorter this year - and the duration of the finals will be 3 hours, starting at 11 am CEST and ending at 2 pm CEST. Scoreboard will be frozen in the last 45 minutes.
Don't forget that the final ceremony and winner announcement will be streamed from Belgrade at 5pm CEST.
During the finals, contestants are allowed to use any code previously written by themselves, as well as any source of information on the Internet. You're not allowed to use somebody else's code.

Feel free to reach out if you have any further questions!

Hope you're all excited and even though we're not meeting in person this year, we're preparing some great digital content for you all!

Good luck and talk to you all very soon.

You can expect more updates about the program in the next two weeks.

Thank you and stay safe,
Bubble Cup Crew

Dear all,

Bubble Cup 13 finals will happen on October 4, 2020 in online format. We will follow up with more detailed information about the rules soon. Stay tuned!

Thank you and stay safe,
Bubble Cup Crew

Dear all,

Due to COVID-19 pandemic the world is facing, for everyone’s safety we have decided to shift Bubble Cup 13 finals to digital realm. We are excited about this new, different approach and we are working on making it a great experience.

We will follow up with more details soon, so stay tuned!

Thank you and stay safe,
Bubble Cup Crew

Dear all,

Qualifications are now over!

Here is the list of finalists that will have the chance to show off their skills on the finals:

• Premier League

• Rising Stars

Thank you and stay safe,
Bubble Cup Crew

Dear contestants,

Bubble Cup Round 1 has just started!

Create a team, collaborate and start solving problems early to increase your chance of qualifying for the Bubble Cup Finals.

Just a reminder, Round 1 lasts 25 days - until April 26^th 14:00 CET.

Good luck!

Bubble Cup Crew

Dear all,

Registration for Bubble Cup 13 opens on March 20^th.

Test round - Round 0 - starts on March 25^th and will last until March 29^th. Scores from this round are not counted in the overall results.

While you wait for Bubble Cup to start please check out Rules page for more info about this year's competition format changes.

Apply and be a part of Bubble Cup community!

Thanks,
Bubble Cup Crew

Bubble Cup 12 is now officially over. Congratulations to this year's Bubble Cup winners:

Premier League

• 1^st place Los Estribos
• 2^nd place Warsaw Akabats
• 3^rd place Uncle Bogdan

Rising Stars

• 1^st place Infinity
• 2^nd place Gii Klub
• 3^rd place Inspekcija

Full scoreboard is available here.

Thanks,

Bubble Cup Crew

Dear competitors,

Qualifications are now over! Thank you for taking part in Bubble Cup and trying your best to qualify for the finals.

Here is the list of finalists that will have the chance to show off their skills on the finals (Belgrade, 14^th September).

• Premier League

• Rising Stars

See you in September!

Thanks,

Bubble Cup Crew

Dear all,

Bubble Cup 12 Round 2 has started!

As always, in Round 2 all classical problems are worth 2 points, while challenge problem is worth maximum 6 points.

Teams that perform the best will be invited to the finals in Belgrade. Finals are scheduled for the 14^th of September.

Good luck!

Bubble Cup Crew

Dear contestants,

Team registrations for Bubble Cup 12 are now open!

If you already have an existing Petlja account from previous years it's recommended that you use it, however you will still need to create (or join) a new team.

Test round - Round 0 - starts 26th March at 14:00 CET and will last until 28 March 14:00 CET. Scores from this round are not counted in the overall results.

Join us to get familiar with submission process and help us test new scoreboards and grading system!

Thanks,

Bubble Cup Crew

Bubble Cup 11 has officially finished. Congratulations to this year's Bubble Cup winners:

Premier League

• 1^st place Warsaw Igloos
• 2^nd place Pchnąć w tę łódź jeża lub ośm skrzyń fig
• 3^rd place BSUIR2

Rising Stars

• 1^st place Bits please
• 2^nd place Inspekcija

Full scoreboard is available here.

Thanks,

Bubble Cup Crew

Bubble Cup finals are starting today at 11:00 CET. You can follow the live scoreboard of the event here.

Please note that during last hour of the competition scoreboard will be frozen. Winners will be announced at the closing ceremony in the evening.

If you want to experience Bubble Cup finals from your home mirror of the finals will be available on Codeforces 90 minutes after the start of the on site competition - 12.30 CET.

For more details about the Codeforces mirror check this Codeforces post.

Thanks,

Bubble Cup Crew

Thank you all for participating in this year's Bubble Cup and putting the all hard work in order to qualify for the finals. The list of finalists coming to Belgrade on 22^nd September is now official.

• Premier League

• Rising Stars

See you again in September!

Bubble Cup Crew

Dear competitors,

Bubble Cup 11 qualifications have finished. Thank you for participating in record number this year!

During next couple of weeks teams submissions will be evaulated and best teams will be invited to compete in Bubble Cup finals on 22^nd September.

Thanks,

Bubble Cup Crew

Last couple of hours grader has been overloaded due to large number of malicious submissions indended to create large queue and make it impossible for other competitors to submit. The problem has now been resolved.

Due to possible large queues we have introduced 15 second delay between the submissions for each account until the end of the contest.

Thanks,

Bubble Cup Crew

Checker for "This Means War" problem had a bug. Regrading of all submitted solutions for this problem has finished.

Sorry,

Bubble Cup Crew

Teams for Bubble Cup are now finalized.

Any team changes from now on will need to get Bubble Cup Crew approval.

You contact us at: bubblecup@petlja.org.

Thanks,

Bubble Cup Crew

Teams for Bubble Cup are now finalized.

Any team changes from now on will need to get Bubble Cup Crew approval.

You contact us at: bubblecup@petlja.org.

Thanks,

Bubble Cup Crew

Due the problems with grader machine we encountered yesterday, we decided to permanently change the grader machine for Round 2.

To ensure same submission conditions, we regraded all yesterday's submissions. Unfortunately, this meant some of the yesterday's successful submissions failed by being too close to the time limit. Please try submitting the problem again to ensure it passes all testcases on the new grader.

Sorry for the inconvenience,

Bubble Cup Crew

Dear all,

Bubble Cup Round 2 has started!

In Round 2 all classical problems are worth 2 points, while challenge problem is worth maximum 6 points.

Good luck to all competitors! Let the coding begin!

Thanks,

Bubble Cup Crew

Dear contestants,

While you were busy solving Round 1 problems we were working on changing underlying database and improving scoreboard performance and looks. New scoreboards will now generate 2-3 times faster than before and also include country flags.

We have also made an improvement to Individual profiles by displaying your current teams inside of them, and fixed problem with accounts getting signed out after 30 minutes even with "Remember me" option set.

Please remember to finalize your teams soon, as you won't be able to edit them 48 hours after Round 2 starts.

See you again in Round 2,

Bubble Cup Crew

Dear contestants,

Bubble Cup Round 1 has just started!

Create a team, collaborate and start solving problems early to increase your chance of qualifying for the Bubble Cup Finals. Exact date of the finals is 22^nd September.

Due to increase in Python popularity on programming competitions, including ACM, submissions in Python 2 and 3 are now also supported.

Just a reminder, Round 1 lasts 25 days - until April 26^th 14:00 CET.

Good luck!

Bubble Cup Crew

Dear contestants,

Registration for Bubble Cup 11 is now open!

If you already have a Petlja account from previous year it's recommended that you use it, but you will need to create a new team.

Test round - Round 0 - starts today at 20:00 CET and will last until 28 March 20:00 CET. Scores from this round are not counted in the overall results.

Join us to get familiar with submission process and help us test new scoreboards and grading system!

Thanks,

Bubble Cup Crew

Bubble Cup X has officially finished. Congratulations to this year's Bubble Cup winners:

• 1^st place Los Estribos
• 2^nd place Jagiellonian Armadillos
• 3^rd place Cheeks

Full scoreboard is available here.

Thanks,

Bubble Cup Crew

We are just couple of days away from the start of the finals. Compilers and IDEs available on the finals are:

• C++
  • IDE: CodeBlocks 16.01, Visual Studio 2017
  • Compiler: MinGW 4.9.2, Visual Studio 2017
• C#
  • IDE: Visual Studio 2017
  • Compiler: Visual Studio 2017
• Pascal
  • IDE: Free Pascal, Lazarus 1.6.4
  • Compiler: Free Pascal Compiler 3.0.2

Thanks,

Bubble Cup Crew

We are very excited to announce the finalists of the 10^th anniversary edition of Bubble Cup! Finals are happening on 2^nd of September in Belgrade.

Thank you all for participating in qualifications and showing your programming skills. If you were too late for Bubble Cup this year, we are reopening the submissions in Practice mode. Practice mode will be active until the 2^nd of September.

Thank you,

Bubble Cup Crew

Qualifications have finished and scoreboard is now frozen. Thanks to everyone that participated in this year's Bubble Cup!

During next week Bubble Cup Crew will go through teams submissions and officially announce teams that qualified to the finals in each category at the beginning of June.

Thanks,

Bubble Cup Crew

We are a week away from the end of Qualification period.

Today we have updated team and competitor profile pages to include more detailed information about teams and competitors. Check them out to see how close your team is to qualify to the Bubble Cup finals.

[Update]: Showing profiles for contestants that haven't joined a team have been fixed. Improved performance for profile pages.

Thanks,

Bubble Cup Crew

We have noticed couple of solutions with the same big O notation as accepted solutions not passing due to different compiler optimizations. To fix this we decided to slightly increase time and memory limit constraints and regrade problems Arrow and Primitive Pythagorean Pairs.

Travelling Knight is also getting an update to slightly increase the diversity of possible approaches.

Updated time/memory constraints:

Arrow: 2s/256MB -&gt 4s/256MB

Primitive Pythagorean Pairs: 1s/128MB -&gt 2s/256MB

Travelling Knight: 0.5s/512MB -&gt 1s/512MB

Thanks,

Bubble Cup Crew

Dear all,

Bubble Cup X Round 2 has officially started!

In this Round all classical problems are worth 2 points. Challenge problem is worth maximum 6 points.

Kind reminder, that starting from Thursday (May 4^th) Bubble Cup teams will be locked. You won't be able to create new teams, change existing team or rename your team.

We wish you best of luck in Round 2. Let the coding begin!

Thanks,

Bubble Cup Crew

Dear contestants,

Round 1 has officially started!

Problems are ready, and Bubble Cup 10 is up and running!

Solve, collaborate and compete.

Let the coding begin and good luck to all.

Just a reminder, Round 1 last 25 days - until April 26^th 14:00 CET

Thanks,

Bubble Cup Crew

Dear contestants,

Registration for Bubble Cup is now open!

Warm up round - Round 0 - is starting today at 14:00 CET. Scores from this round are not counted in the overall results.

Join us to get familiar with submission process and help us test the new grading system!

Thanks,

Bubble Cup Crew