Create trees-3.java

[Praniksha123]

No description provided.

[super30admin]

Path Sum II (trees-3.java)

Strengths:

• Clear and well-documented code with step-by-step comments
• Proper use of backtracking in the pathSum solution
• Clean separation of concerns with helper methods
• Good variable naming conventions
• Correct handling of edge cases (null root)

Areas for Improvement:

• The time complexity claim of O(n) for pathSum is slightly misleading - worst case is O(n²) due to path copying
• Could add early termination optimization for cases where negative values aren't a concern
• Consider using path.removeLast() (Java 21+) or path.remove(path.size()-1) with explicit comment for clarity

Note: The problem statement only asks for Path Sum II, but the student included an additional problem (Symmetric Tree). Both solutions are correct and well-implemented.

VERDICT: PASS

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Symmetric Tree

Strengths:

• Clean, well-structured recursive solution
• Correct base case handling
• Good variable naming (left, right)
• Proper use of early returns

Areas for Improvement:

1. The problem statement mentions "Follow up: Could you solve it both recursively and iteratively?" - you only provided the recursive solution. Consider implementing the iterative approach using a queue (as shown in the reference solution) to fully address the problem.
2. The solution includes code for a different problem (Path Sum) which is not relevant to this submission.
3. Consider adding comments explaining the mirror property being checked.

VERDICT: PASS