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清华大学:《数据结构》课程电子教案(PPT课件讲稿)Chapter5 trees

Definition A tree is a collection of nodes. The collection can be empty: otherwise, a tree consists of (1) a distinguished node r, called the root; (2)and zero or more nonempty(sub)trees T1,., Tk, each of whose roots are connected by a directed edge from r Note:
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