Universal Cup Judging System

Universal Cup

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ucup-team5027

Usergroup

Default

Organization

Southern University of Science and Technology

Motto

Benson's law: $$\dbinom{n}{2k}2^{2k}=\sum\limits_{i=0}^k(-1)^i\dbinom{n}{i}\dbinom{2n-2i}{2k-2i}$$