Create Array1.java

[Praniksha123]

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[super30admin]

Product of Array Except Self (Array1.java)

Evaluation

Problem 1: Product of Array Except Self

Student's Solution Analysis:

• ✅ Correctly implements the O(n) prefix-suffix approach
• ✅ No division used
• ✅ Output array doesn't count toward space complexity (O(1) extra space)
• ✅ Handles the problem constraints properly

Comparison to Reference:

• Reference uses O(n²) brute force approach
• Student uses optimal O(n) time with O(1) extra space
• Student's solution is significantly better

Problem 2: Diagonal Traverse

Student's Solution Analysis:

• ✅ Correctly implements diagonal traversal logic
• ✅ Handles boundary conditions properly
• ✅ Uses O(m*n) time complexity
• ✅ Uses O(1) extra space (output array not counted)

Comparison to Reference:

• No reference solution provided for this problem
• Student's solution appears correct and efficient

Problem 3: Spiral Matrix

Student's Solution Analysis:

• ✅ Correctly implements the boundary-based spiral traversal
• ✅ Properly handles edge cases with boundary checks
• ✅ Uses O(m*n) time complexity
• ✅ Uses O(1) extra space

Comparison to Reference:

• No reference solution provided for this problem
• Student's solution appears correct and efficient

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Feedback

Strengths:

1. Excellent understanding of optimal algorithms - The student correctly identified and implemented the O(n) solution for Problem 1, which is significantly better than the reference O(n²) solution
2. Clear documentation - Each solution has a well-structured comment block explaining the approach
3. Proper space complexity awareness - Student correctly notes that output arrays don't count toward extra space
4. Consistent coding style - Clean formatting with proper variable naming
5. Boundary condition handling - Good implementation of edge cases in Problems 2 and 3

Areas for Improvement:

1. Inconsistent variable naming - Some variables like res and result are used interchangeably; pick one convention
2. Missing test cases - No test harness or example usage provided to validate the solutions
3. Problem 2 could use comments - The diagonal traversal logic is complex; additional inline comments would improve readability

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The student's solutions demonstrate a strong understanding of array manipulation problems and optimal algorithmic approaches. The student correctly implemented the O(n) solution for Product of Array Except Self, which is superior to the reference solution. All three problems show proper time/space complexity analysis and clean, well-documented code. The solutions are production-ready and follow best practices.

VERDICT: PASS

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Diagonal Traverse

Strengths:

• The diagonal traversal solution (Problem 2) is well-implemented with correct logic
• Good use of comments explaining the approach
• Clean variable naming (m, n, row, col, idx)
• Proper boundary condition handling
• The solution handles all edge cases correctly

Areas for Improvement:

• The submission includes TWO extra problems (productExceptSelf and spiralOrder) that were not requested. Only Problem 2 is relevant to the Diagonal Traverse problem.
• Focus on submitting only the solution to the problem that was asked
• The comments could be slightly more detailed regarding the direction logic

Note: The student appears to have submitted solutions for multiple LeetCode problems together. For this evaluation, only the diagonal traverse solution (Problem 2) is relevant.

VERDICT: PASS

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Spiral Matrix

Strengths:

1. The Spiral Matrix solution is well-implemented with correct boundary handling
2. Good use of comments explaining the approach step-by-step
3. Proper handling of edge cases (when rows or columns become exhausted)
4. Clean, readable code structure

Areas for Improvement:

1. The submission includes solutions for other problems (Product Except Self and Diagonal Order) that were not requested. Focus on the specific problem asked.
2. The comments could be more concise while maintaining clarity.

VERDICT: PASS