Tree: Depth-First Search - Path Sum
Consider two approaches to solve Path Sum: (1) recursive DFS with early stopping, (2) iterative DFS using a stack. When is the iterative approach preferable?
Consider two approaches to solve Path Sum: (1) recursive DFS with early stopping, (2) iterative DFS using a stack. When is the iterative approach preferable?
hard⚖️ Approach Comparison Q8 of Q15
Step-by-Step Solution
Solution:
Step 1: Compare recursion vs iteration
Recursive DFS uses call stack which can overflow on deep trees.Step 2: Identify when iterative DFS is better
Iterative DFS avoids recursion stack overflow, preferable for very deep trees.Final Answer:
Option C -> Option CQuick Check:
Deep trees -> iterative DFS safer [OK]
Quick Trick: Deep recursion -> prefer iterative DFS [OK]
Common Mistakes:
MISTAKES- Assuming recursion always better
- Ignoring stack overflow risk
Trap Explanation:
PITFALL- Candidates often overlook recursion depth limits and stack overflow risks.
Interviewer Note:
CONTEXT- Tests tradeoff reasoning between recursion and iteration.
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