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Given the following binary tree:

easy🧾 Trace Q3 of Q15
Tree: Depth-First Search - Binary Tree Inorder Traversal
Given the following binary tree:

    4
   / \
  2   5
 / \
1   3

What is the output list after performing Morris inorder traversal on this tree?
A[1, 2, 3, 4, 5]
B[4, 2, 1, 3, 5]
C[1, 3, 2, 4, 5]
D[5, 4, 3, 2, 1]
Step-by-Step Solution
Solution:

  1. Step 1: Understand Morris inorder traversal

    It outputs nodes in inorder without recursion or stack.

  2. Step 2: Determine inorder sequence

    Inorder traversal visits left subtree, node, then right subtree. For given tree: 1,2,3,4,5.

  3. Final Answer:

    Option A -> Option A

  4. Quick Check:

    Sequence is sorted ascending, matching inorder [OK]
Quick Trick: Morris traversal outputs inorder sequence without extra space [OK]
Common Mistakes:
MISTAKES
  • Confusing preorder or postorder output
  • Misreading tree structure
  • Assuming Morris traversal changes node order
Trap Explanation:
PITFALL
  • Incorrectly assuming preorder or postorder output instead of inorder.
Interviewer Note:
CONTEXT
  • Tests ability to trace Morris inorder traversal output on a simple tree.
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