Codeforces Round #697 (Div. 3)——C~G_masha works in an advertising agency. in order to

作者：菜鸟追梦旅行 | 2024-02-09 10:37:54

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masha works in an advertising agency. in order to promote the new brand, she

C. Ball in Berland

time limit per test2 seconds
memory limit per test256 megabytes
inputstandard input
outputstandard output
At the school where Vasya is studying, preparations are underway for the graduation ceremony. One of the planned performances is a ball, which will be attended by pairs of boys and girls.
Each class must present two couples to the ball. In Vasya’s class,

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