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Mahmoud and Ehab continue their adventures! As everybody in the evil land knows, Dr. Evil likes bipartite graphs, especially trees.A tree is a connected acyclic graph. A bipartite graph is a graph, who

C - 2D Plane 2N Points Time limit : 2sec / Memory limit : 256MBScore : 400 pointsProblem Statement On a two-dimensional plane, there are N red points and N blue points. The coordinates of the i-...

题目描述 Nowcoder University has 4n students and n dormitories ( Four students per dormitory). Students numbered from 1 to 4n.And in the first year, the i-th dormitory ‘s students are (x1[i],x2[i],x3[...