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Codeforces Round #668 (Div. 1, Div. 2) starts on the 6th of September at 14:35 UTC.
Please, join by the link https://codeforces.com/contests/1404,1405
A new lesson in the EDU section is presented by Vitaly Aksenov - the researcher at ITMO University, the member of the Jury Committee of several olympiads such as NERC, Bioinformatics Contest, Russian Code Cup and etc, Ph.D. The theme of the lesson is Disjoint Sets Union (DSU).

Please, join the "ITMO Academy: pilot course" by the link https://codeforces.com/edu/courses