[Solved] You need to output the values of a binary tree's nodes in the order:... Which approach best fits this requirement? | Tree: Depth-First Search

Tree: Depth-First Search - Binary Tree Inorder Traversal

You need to output the values of a binary tree's nodes in the order: left subtree, node itself, then right subtree, without modifying the tree structure or using extra space proportional to the tree height. Which approach best fits this requirement?

AUse a breadth-first search (BFS) to visit nodes level by level.

BUse a recursive preorder traversal that visits root, left, then right nodes.

CUse Morris traversal to perform inorder traversal with O(1) extra space by temporarily modifying tree links.

DUse a dynamic programming approach to store and reuse subtree results.

Step-by-Step Solution

Step 1: Understand traversal order requirement
Inorder traversal visits left subtree, then node, then right subtree, matching the problem's order.
Step 2: Identify approach with O(1) space
Morris traversal achieves inorder traversal without recursion or stack by temporarily modifying tree pointers, restoring them after use.
Final Answer:
Option C -> Option C
Quick Check:
Morris traversal is known for O(1) space inorder traversal [OK]

Quick Trick: Morris traversal enables inorder with O(1) space [OK]

Common Mistakes:

MISTAKES

Confusing preorder with inorder traversal order
Assuming BFS can produce inorder sequence
Thinking DP applies to traversal order

Trap Explanation:

PITFALL

Candidates often pick recursive preorder or BFS as they know them well, but these don't produce inorder or use O(1) space.

Interviewer Note:

CONTEXT

Tests if candidate can identify traversal pattern and space optimization technique.

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Which approach best fits this requirement?

Step 1: Understand traversal order requirement

Step 2: Identify approach with O(1) space

Final Answer:

Quick Check:

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