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Exercise 1

Write a recursive definition for post-order traversal of a binary tree, including the base case and the recursive step.

Solution

Base Case

The base case is the same one as in the previous two problems:

Base Case: Return from the function if node is null.

Recursive Definition

For the recursive definition in this problem, like in the previous problem, we have to follow a pattern, this time LRN.

Recursive Definition: Perform a postorder traversal by first traversing current node's left child, then perform a postorder traversal on the current node's right child, and finally, add the node's value to the result array.

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