Completed Array-1

[sandeepkumarks]

No description provided.

[super30admin]

Product Except Self (ProductOfArray.java)

Strengths:

• Excellent approach using prefix and suffix products achieving O(n) time complexity
• Properly avoids division operation as required
• Good use of descriptive variable names (rp for running product)
• Well-commented code explaining the algorithm logic
• Space complexity is O(1) extra (output array doesn't count per problem statement)
• Clean, readable implementation

Areas for Improvement:

• The second loop could be simplified. Currently it mixes updating result[i] with updating rp in the same iteration. A cleaner approach would be to first compute suffix products separately, then combine with prefix products.
• The loop condition i >= 0 in the second loop could potentially cause issues if nums.length is 0 (though constraints guarantee length >= 2).
• Consider adding a brief comment explaining why we start from nums.length - 2 (to skip the last element which has no right neighbor).

Overall, this is a solid, efficient solution that demonstrates good understanding of the problem and optimal algorithm design.

VERDICT: PASS

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Diagonal Traverse (DiagonalTraverse.java)

Strengths:

• The solution correctly implements the diagonal traversal algorithm with proper boundary handling
• Clear and descriptive variable names make the code easy to follow
• Good inline comments explaining the approach
• Efficient O(m*n) time complexity with O(1) auxiliary space
• Clean code structure with consistent formatting

Areas for Improvement:

• The solution is well-written overall. One minor enhancement could be adding input validation to handle edge cases (e.g., empty matrix), though the problem constraints guarantee valid input.
• Consider extracting the direction-flipping logic into a helper method for even cleaner code, though this is optional and may reduce readability for such a straightforward algorithm.

The solution demonstrates a solid understanding of the problem and implements an efficient, correct algorithm.

VERDICT: PASS

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Spiral Matrix (SpiralMatrix.java)

Strengths:

• Correctly implements the spiral traversal algorithm with proper boundary management
• Good variable naming conventions that clearly indicate their purpose
• Includes helpful comments explaining the approach
• Properly handles edge cases when the matrix becomes a line or single row/column
• Time and space complexity match the optimal reference solution

Areas for Improvement:

• Missing import statements (import java.util.ArrayList; and import java.util.List;) - while this might work in some IDEs, it's necessary for compilation
• Inconsistent indentation in some places (e.g., the if statements) - consider aligning the code for better readability
• Could add a null/empty check for the matrix input for robustness
• Consider using more descriptive class names (LeetCode style would be Solution)

The solution demonstrates solid understanding of the problem and correctly implements an optimal algorithm.

VERDICT: PASS