题目内容

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

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

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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

单选题 A vertex in a digraph has four arcs entering and three arcs leaving. The outdegree of the vertex is ().

A. 4
B. 3
C. 2
D. 1

单选题 A vertex in a digraph has 2 arcs entering and 3 arcs leaving. The degree of the vertex is ().

A. 2
B. 3
C. 4
D. 5