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. There is no restriction on the number of teams from Serbia. 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!