Completed Array-1 Assignment

[Hriday-A]

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[super30admin]

Product Except Self (Product_except_self.java)

Strengths:

• The solution efficiently computes the required product in O(n) time and O(1) extra space, which is optimal for this problem.
• The code is concise and uses a clever two-pass approach.

Areas for improvement:

• While the code is efficient, adding comments would enhance readability. For example, explaining that the first loop computes the product of all elements to the left and the second loop computes the product of all elements to the right and combines them.
• The variable name rp is acceptable, but a more descriptive name like runningProduct might be better for clarity, especially for those reading the code for the first time.
• Consider initializing res[0] = 1 and then starting the first loop from index 1, which is correct, but it might be helpful to note why (the left product for the first element is 1 since there are no elements to the left).

Overall, the student has implemented an excellent solution that meets all the problem constraints and optimizations.

VERDICT: PASS

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Diagonal Traverse (diagonal_traverse.java)

Strengths:

• The solution is correct and efficient, matching the reference solution in both time and space complexity.
• The code is well-commented, making it easy to understand the logic behind each step.
• The use of a direction flag (boolean) is appropriate and simplifies the control flow.

Areas for Improvement:

• While the code is correct, it could be slightly optimized for readability by reducing redundant comments. For example, the comments "move up", "move right", etc., are somewhat redundant since the code itself is clear.
• The variable names r and c are concise but could be more descriptive (e.g., row and col), though this is a minor point.
• The solution assumes that the matrix is non-empty. It might be good to add a check for empty input (though the constraints state that m, n >= 1).
• The comments at the end (the summary) are helpful for understanding, but they are more appropriate as part of the solution explanation rather than in the code itself. The code should remain concise.

Overall, this is an excellent solution that demonstrates a clear understanding of the problem.

VERDICT: PASS

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Spiral Matrix (spiral_matrix.java)

Your solution is correct and efficient. It follows the same logic as the reference solution. The code is readable and well-organized. Here are a few minor suggestions to improve code style:

• Add spaces around operators and after semicolons in for loops for better readability. For example, write for (int i = left; i <= right; i++) instead of for(int i=left; i<=right;i++).
• Similarly, add spaces after the if keyword and around the conditions: if (top <= bottom) instead of if(top<=bottom).
• The comments at the end are helpful, but you might consider adding comments above the while loop or within to explain each step (right, down, left, up) for clarity.

Overall, great job! Your solution is optimal in both time and space complexity.

VERDICT: PASS