Product of Array Except Self, Diagonal Traverse and Spiral Matrix

[anirudhv98]

Completed Array-1, please review.

[super30admin]

Product Except Self (Problem1.cs)

Strengths:

• Excellent implementation of the prefix-suffix product technique
• Time complexity is O(n), which is optimal for this problem
• Space complexity is O(1) extra space (excluding output array)
• Code is clean, readable, and well-commented
• Successfully runs on Leetcode

Areas for Improvement:

• The solution is already highly optimized; no major improvements needed
• Minor suggestion: Could add a null/empty check for robustness, though not strictly necessary given problem constraints

This is a textbook solution for the product except self problem.

VERDICT: PASS

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Diagonal Traverse (Problem2.cs)

This is a solid implementation of the diagonal traversal problem. Your approach mirrors the reference solution closely and demonstrates a good understanding of the algorithm.

Strengths:

• Clean, readable code with descriptive variable names
• Correct handling of all boundary conditions for both directions
• Proper use of comments explaining complexity
• Efficient algorithm that visits each element exactly once

Areas for minor improvement:

• The variable name columns could be more conventional as cols to match common conventions
• Consider adding inline comments explaining the direction logic for better code documentation
• The dir variable could use an enum or named constants for better readability (e.g., UP=1, DOWN=-1)

Overall, this is a correct and efficient solution that demonstrates good problem-solving skills.

VERDICT: PASS

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Spiral Matrix (Problem3.cs)

Strengths:

• Correct algorithm implementation with proper boundary checks
• Clean variable naming convention
• Good use of early returns with conditional checks to prevent invalid traversals
• Same time and space complexity as the optimal reference solution

Areas for Improvement:

• The comments are misleading - they don't match the actual traversal order. The first loop traverses the top row (not "left"), the second traverses the right column (not "bottom"), etc.
• Consider adding a brief explanation of the spiral order in the comments for better code documentation

Overall, this is a solid solution that correctly solves the problem with optimal complexity.

VERDICT: PASS