题目内容

单选题 In a binary tree, each node has () two subtrees.

A. more than
B. less than
C. at most
D. at least

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单选题 In a preorder traversal, the () is processed first.

A. left subtree
B. right subtree
C. root
D. a or b

单选题 In a postorder traversal, the root is processed ().

A. first
B. second
C. last
D. a or b

单选题 In an inorder traversal, the root is processed ().

A. first
B. second
C. last
D. a or b

单选题 ()is a line between two vertices in a digraph.

A node
B. An arc
C. An edge
D. A path