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判断题 A leaf is a node with an outdegree of zero. ( ) 对 ( ) 错
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判断题 If the tree is not empty, the first node is called root, which has the indegree of one. ( ) 对( ) 错
判断题 In the postorder, you process the left subtree first, followed by the right subtree and then the root. ( ) 对 ( ) 错
判断题 In a directed graph, or digraph, each line has a direction. ( ) 对 ( ) 错
判断题 A cycle is a path of at least three vertices that starts and ends with the same vertex. ( ) 对 ( ) 错
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