Completed Design-1 Assignment

[tejbharath]

Please note that I tried using my spouse's (Pubali) laptop, and the last commit for the HashSet implementation got tagged as if she had committed it. Sorry for this confusion

[super30admin]

Design HashSet (MyHashSet.java)

Your solution is excellent and matches the reference solution in both approach and correctness. Here are some observations:

Strengths:

• Correct implementation of the two-level boolean array approach
• Proper handling of the edge case where primaryHash == 0 (to accommodate key = 10^6)
• Clean separation of concerns with private helper methods for hashing
• Lazy initialization of secondary arrays saves space
• O(1) time complexity for all operations

Minor suggestions for improvement:

• Consider using more descriptive variable names like primaryIndex and secondaryIndex instead of primaryHash and secondaryHash - these aren't actually hash values but indices derived from hashing
• The code could benefit from a brief comment explaining why the special case for primaryHash == 0 is needed (to handle key = 10^6 which would otherwise cause an ArrayIndexOutOfBoundsException)
• Consider adding Javadoc comments for the public methods to improve documentation

Overall: This is a well-implemented solution that demonstrates a solid understanding of hash set design with collision avoidance through the two-level array structure.

VERDICT: PASS

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Min Stack (MinStack.java)

Strengths:

1. Your solution is correct and handles all edge cases properly.
2. The approach of only pushing to minSt when a new minimum is found is a clever optimization that saves space in practice.
3. Good comments explaining your approach and time/space complexity.
4. Clean code structure with proper class organization.

Areas for Improvement:

1. The reference solution is simpler - it pushes to minSt on every push operation, which makes the code easier to understand and reason about. Your approach is more space-efficient but slightly more complex.
2. Consider adding more inline comments to explain the logic in the push and pop methods, especially the conditional logic.
3. The variable name value in push(int value) could be val to match the problem statement, though this is a minor style preference.

Overall, this is a solid implementation that demonstrates good understanding of the problem.

VERDICT: PASS