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Data Structures | Binary Search Trees | Question 8
  • Difficulty Level : Hard
  • Last Updated : 01 Mar, 2013
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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


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