Hello, Codeforces!

Hope you're all safe and well.

Microsoft Development Center Serbia is thrilled to announce the finals of the 13th edition of Bubble Cup competition! Bubble Cup is an international, ACM-style team contest aimed at university and high school students.

Contest will take place on Sunday, 4th of October at 11AM CEST, virtually. Live results will be available on the official Bubble Cup website (results will be frozen during the last 45 minutes of the competition). Winners will be announced at the closing ceremony. You can find more info on the BubbleCup website.

Just like the previous editions, this final will be followed by an online mirror competition on Codeforces. Mirror will take place on Monday, 5th of October at 15:05 CEST. Contest will last for 3 hours and ACM ICPC rules will be applied. It will be a competition for teams of 1-3 members. There will be at least eight problems.

Just like last year, the finals are divided in two "divisions", called Premier League and Rising Stars. The two contests will have most of their problems in common, but the Rising Stars competition will feature some easier tasks targeted at high school contestants.

Both of the contests will be mirrored here on Codeforces, with Premier League mapping to the Div1 contest and Rising Stars mapping to the Div2 contest. The mirror will use native Codeforces ACM-ICPC team contest rules.

We kindly ask participants of the virtual finals to hold off discussing problems publicly until the mirror is over.

Contest was mainly prepared by employees of MDCS with help from our alumni member Lazar Milenković (milenkoviclazar). We give our thanks to Nikolay Kalinin (KAN) for the round coordination, Mike Mirzayanov (MikeMirzayanov) and the team behind Codeforces and Polygon platforms. Special thanks goes to Alexandr Lyashko (knightL) for helping out with problem testing.

The contest will be unrated. The reason for this is because rules of this contest are not common for Codeforces.

Editorial will be available in the booklets section on the Bubble Cup website sometime after the online mirror ends.

You can find problems from previous finals on our Codeforces online mirror competitions:

Bubble Cup 8 — Finals [Online Mirror]

Bubble Cup 9 — Finals [Online Mirror]

Bubble Cup X — Finals [Online Mirror]

Bubble Cup 11 — Finals [Online Mirror, Div. 1]

Bubble Cup 11 — Finals [Online Mirror, Div. 2]

Bubble Cup 12 — Finals [Online Mirror, Div. 1]

Bubble Cup 12 — Finals [Online Mirror, Div. 2]

We wish you best of luck in competition!

Update #1: 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.

Update #2: Congratulations to the winners!

Div1:

1. Omatase-Trinity: hos.lyric, maroonrk, yosupo
2. Almost Retired Dandelion: Merkurev, Um_nik
3. times187: Cyanic, ix35, s_r_f
4. tourist
5. Itst两小时阿克离场: newbiegcz, Itst, pupiI

Div2:

1. 2-sad walk: Dart-Xeyter, tem_shett, sevlll777
2. TeamSeven: liit_mixer, sachin208, jnarutoj
3. Fast but not Furious: amirmohammad-nezami, armin.atarod, ymmparsa
4. （￣ー￣）: noneTP
5. heh: Eyed, penguinhacker, el_heffeh

Preliminarily version of the editorial can be found here. Full version of the booklet will be published at a later time.

Hello, Codeforces!

Microsoft Development Center Serbia is thrilled to announce the start of the 13th edition of Bubble Cup competition! Bubble Cup is an international, ACM-style team contest aimed at university and high school students.

You can register and take part in the competition on the BubbleCup website. Qualifications consist of two online rounds which start on the 1st of April and on the 1st of May and last for 25 days each. Both online rounds will feature around 10 problems selected from various Online Judges, including at least one challenge problem!

The best 16 teams will compete in the 5-hour long finals in Belgrade, Serbia, tentative date being September 2020 due to COVID-19 situation.

Biggest change in the rules from the previous iterations is that now for any country other than Serbia there can be at most 2 teams in the finals. Please check the updates rules on the BubbleCup website.

You can find problems from previous finals on our Codeforces online mirror competitions:

Bubble Cup X — Finals [Online Mirror]

Bubble Cup 11 — Finals [Online Mirror, Div. 1]

Bubble Cup 12 — Finals [Online Mirror, unrated, Div. 1]

We wish you best of luck in competition! Let the coding begin!

Hello Codeforces!

It is my pleasure to announce summer seminar "Machine Learning and Pattern Recognition", which will be held from July 25, to August 2, 2015, in Petnica Science Center, Serbia.

Seminar is open to applications of all interested students of technical faculties, especially those in the final year of study.

You can find more info on the official website.

Hello!

I'm happy to announce the start of 8th iteration of BubbleCup competition.

BubbleCup is "ACM-style" team competition organized by Microsoft Development Center Serbia held annually in Belgrade in September. Qualification consists of two online rounds which start on first of April and May and last for 25 days. Best teams will compete in 5 hours long final in Belgrade.

Teams can consist of high school pupils or students. Students must attend the same university. Complete rules can be found here.

Best of luck in the competition!

Aleksandar

UPD1: Second round starts on the first of May, not March!