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What is the result of a post-order traversal on a binary tree with nodes 1, 2, a

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Question: What is the result of a post-order traversal on a binary tree with nodes 1, 2, and 3, where 1 is the root, 2 is the left child, and 3 is the right child?

Options:

  1. 1, 2, 3
  2. 2, 3, 1
  3. 3, 2, 1
  4. 1, 3, 2

Correct Answer: 2, 3, 1

Solution: 

In post-order traversal, we visit the left child, then the right child, and finally the parent. Thus, the output is 2, 3, 1.

What is the result of a post-order traversal on a binary tree with nodes 1, 2, a

Practice Questions

Q1
What is the result of a post-order traversal on a binary tree with nodes 1, 2, and 3, where 1 is the root, 2 is the left child, and 3 is the right child?
  1. 1, 2, 3
  2. 2, 3, 1
  3. 3, 2, 1
  4. 1, 3, 2

Questions & Step-by-Step Solutions

What is the result of a post-order traversal on a binary tree with nodes 1, 2, and 3, where 1 is the root, 2 is the left child, and 3 is the right child?
  • Step 1: Identify the structure of the binary tree. The tree has a root node (1), a left child (2), and a right child (3).
  • Step 2: Understand the post-order traversal method. In post-order traversal, we visit the left child first, then the right child, and finally the parent node.
  • Step 3: Start the traversal at the root node (1).
  • Step 4: Move to the left child (2). Since 2 has no children, we visit 2 and record it.
  • Step 5: Return to the root (1) and now move to the right child (3). Since 3 has no children, we visit 3 and record it.
  • Step 6: After visiting both children (2 and 3), return to the root (1) and visit it last, recording it.
  • Step 7: Compile the results in the order they were visited: first 2, then 3, and finally 1.
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