单选题 In a preorder traversal, the () is processed first.
A. left subtree
B. right subtree
C. root
D. a or b
查看答案
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
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
微信支付 
支付宝支付