Question

If a binary search tree is constructed with the below values 30,40,50,60,70,80,90,100. _ is the sequence obtained as output with preorder traversal​

Answer 1

Answer:

The preorder traversal sequence of a binary search tree is 30, 20, 10, 15, 25, 23, 39, 35, 42. Which one of the following is the postorder traversal sequence of the same tree?

(A) 10, 20, 15, 23, 25, 35, 42, 39, 30

(B) 15, 10, 25, 23, 20, 42, 35, 39, 30

(C) 15, 20, 10, 23, 25, 42, 35, 39, 30

(D) 15, 10, 23, 25, 20, 35, 42, 39, 30

Answer: (D)

Explanation: The following is the constructed tree

30 / \ 20 39 / \ / \ 10 25 35 42 \ / 15 23