Tree: Depth-First Search - Binary Tree Inorder Traversal
If a binary tree's nodes only have parent pointers (no left or right child pointers), which method can correctly produce the inorder traversal sequence?
If a binary tree's nodes only have parent pointers (no left or right child pointers), which method can correctly produce the inorder traversal sequence?
hard🔁 Follow-up Q10 of Q15
Step-by-Step Solution
Solution:
Step 1: Recognize pointer limitations
No left/right child pointers means standard recursion or Morris traversal is impossible.Step 2: Use parent pointers smartly
Traverse up/down using parent pointers, track visited nodes to simulate inorder traversal.Final Answer:
Option D -> Option DQuick Check:
Only parent pointers require careful navigation and state tracking [OK]
Quick Trick: Parent pointers require tracking visited nodes for inorder [OK]
Common Mistakes:
MISTAKES- Trying recursive traversal without child pointers
- Assuming Morris traversal works without child pointers
- Confusing level-order with inorder traversal
Trap Explanation:
PITFALL- Assuming standard traversal methods work without child pointers is incorrect.
Interviewer Note:
CONTEXT- Tests understanding of traversal adaptations when only parent pointers are available.
Master "Binary Tree Inorder Traversal" in Tree: Depth-First Search
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