Tree: Depth-First Search - Binary Tree Inorder Traversal
What is the space complexity of the iterative inorder traversal using a stack on a binary tree with height h?
What is the space complexity of the iterative inorder traversal using a stack on a binary tree with height h?
medium🪤 Complexity Trap Q6 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand stack usage
Stack stores nodes along the path from root to current node, max height h.Step 2: Relate height to n
Space complexity depends on tree height h, which can be up to n in worst case.Final Answer:
Option B -> Option BQuick Check:
Iterative stack space equals tree height O(h) [OK]
Quick Trick: Stack space = tree height = O(h) [OK]
Common Mistakes:
MISTAKES- Assuming O(1) space for iterative
- Confusing with recursive stack space O(h)
Trap Explanation:
PITFALL- Candidates forget stack stores path nodes, so space depends on height, not constant.
Interviewer Note:
CONTEXT- Tests understanding of auxiliary space in iterative traversal
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