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填空题 A ____in a tree is a node with an outdegree of zero.

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填空题 A leaf in a tree is a node with an outdegree of ____.

填空题 Using the depth_first approach ,you traverse a binary tree in three sequences: , , and .

填空题 There are two standard graph traversals: first and first.

填空题 The most common methods used to store a graph are the method and the method.