Submit Design-1

[sureshb18]

Code changes done for Design -1

[super30admin]

Strengths:

• The solution is straightforward and easy to understand.
• All operations (add, remove, contains) are implemented correctly with constant time complexity.
• The code is clean and well-commented, explaining the approach clearly.

Areas for Improvement:

• The space complexity is O(1000001) which is constant but uses more memory than necessary, especially if the number of elements stored is small. The reference solution uses a double hashing technique to reduce the space usage by having a 2D array that only allocates secondary arrays when needed. This approach is more memory efficient for sparse datasets.
• The current solution is not scalable beyond the given key range. If the problem constraints were to change (e.g., keys up to 10^9), this approach would not work. Using a dynamic hashing method like the reference solution would handle larger ranges better.
• Consider using a more efficient hashing technique to minimize memory usage while maintaining constant time operations. For example, the reference solution uses a primary bucket array of size 1000 and secondary arrays of size 1000 (with one extra for the edge case), which reduces the overall memory footprint.

[sureshb18]

updated code with less memory

[super30admin]

Strengths:

• The student has provided two solutions, showing an understanding of different approaches.
• The double hashing solution is implemented correctly and efficiently.
• The code is clean, well-commented, and follows good practices (e.g., using helper methods for hash calculations).
• The edge case for key 1,000,000 is handled appropriately.

Areas for Improvement:

• The commented-out simple solution is not necessary in the final submission. It's good to explore multiple approaches, but for production code, only the optimal solution should be kept.
• The variable names in the double hashing solution could be more descriptive. For example, p could be renamed to primaryIndex for clarity.
• The student might consider adding a brief comment explaining why the first bucket requires an extra slot (for key 1,000,000) to make the code more self-documenting.

Overall, the student has demonstrated a strong understanding of the problem and has implemented an efficient solution.