Tree: Depth-First Search - Binary Tree Postorder Traversal
What is the output of the iterative postorder traversal code using one stack and a pointer when the input tree is a single node with value 42?
What is the output of the iterative postorder traversal code using one stack and a pointer when the input tree is a single node with value 42?
medium🧾 Code Trace Q4 of Q15
Step-by-Step Solution
Solution:
Step 1: Trace traversal on single node tree
Current points to root(42), no left child, append 42 after popping.Step 2: Confirm output
Only one node, output is [42].Final Answer:
Option A -> Option AQuick Check:
Single node outputs its value once [OK]
Quick Trick: Single node outputs its value once [OK]
Common Mistakes:
MISTAKES- Returning empty list
- Appending node multiple times
Trap Explanation:
PITFALL- Candidates sometimes forget to handle single-node trees correctly, resulting in empty or duplicated output.
Interviewer Note:
CONTEXT- Tests handling of edge cases in iterative traversal
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