python implementation Week01-Day02

[akarshchandra]

python implementation

[super30admin]

Implement Hash Set (problem1.py)

Strengths:

1. Excellent understanding of hashing concepts - the comments explaining double hashing vs linear probing and chaining demonstrate deep conceptual knowledge
2. Clean, well-documented code with clear method separation
3. Correct edge case handling (bucket 0 gets extra space)
4. Efficient O(1) operations for all three required methods
5. Good use of lazy initialization to save space

Areas for Improvement:

1. The variable name arrPos could be more descriptive as secondaryIndex for consistency with the reference solution
2. Consider adding type hints for better code documentation (e.g., def add(self, key: int) -> None: is already present, which is good)
3. The comment about "bruteforce" having an array of 10^6 could be clarified - the current approach is actually the optimized one, not bruteforce

Minor Suggestions:

• The return statements at the end of add/remove methods are unnecessary in Python but don't affect functionality
• Could add docstrings to the class for better documentation

Overall, this is a solid implementation that demonstrates strong understanding of hash table concepts and achieves optimal time complexity.

VERDICT: PASS

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Implement Min Stack (problem2.py)

Strengths:

• Correctly implements the O(1) requirement for all operations
• Single stack approach is more space-efficient than the two-stack reference solution in most cases
• Clear comments explaining the approach and why it works
• Good edge case handling (val == min case)
• Clean, readable code structure

Areas for Improvement:

• The return statements at the end of push and pop are unnecessary in Python and add visual noise
• Could add type hints for better code documentation (e.g., def push(self, val: int) -> None:)
• The if not self.stack: return in pop is defensive but unnecessary given the problem constraints (pop will always be called on non-empty stacks)

Minor suggestions:

• Consider using if self.stack: instead of if not self.stack: for slightly better readability
• The comment about approach2 is a bit verbose; could be more concise

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

VERDICT: PASS