Trees-3 Assignment Completed

[Hriday-A]

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[super30admin]

Root-to-leaf Sum II (path_sum_2.java)

Strengths:

• Correct use of backtracking pattern - the path.remove() is properly placed after both recursive calls
• Clean separation of concerns with a dedicated helper method
• Good variable naming (sum, path, result)
• Proper handling of edge cases (null root, leaf node check)

Areas for Improvement:

• The solution is already optimal for this problem. One minor suggestion: you could use path.removeLast() instead of path.remove(path.size()-1) for better readability in Java 21+, but your current approach is more widely compatible.
• Consider adding null checks or documentation for clarity, though the current implementation is already clear.

The solution is functionally equivalent to the reference solution and demonstrates solid understanding of the backtracking pattern for tree traversal problems.

VERDICT: PASS

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Mirror Image of Itself Tree (Symmetric_tree.java)

Strengths:

1. Correctly implements the symmetric tree algorithm
2. Good use of early termination with the flag variable
3. Better space complexity than the iterative approach (O(h) vs O(n))
4. Clean separation of concerns with a private helper method
5. Well-commented code with both approaches shown

Areas for Improvement:

1. The flag variable approach works but is not the cleanest pattern. Consider using direct return false statements instead, which would make the code more straightforward and eliminate the need for the flag field.
2. The commented-out iterative solution should be removed to keep the code clean and focused.
3. The recursive helper method could be simplified by returning boolean values directly instead of relying on a class-level flag.

VERDICT: PASS