Python implementation - queue using stack + hashmap design

[shaikhmisrail]

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[super30admin]

Strengths:

1. The solutions are correct and efficient, meeting the problem requirements.
2. The code is well-structured and readable, with comments explaining the approach and complexity.
3. For the queue problem, the amortized O(1) operations are implemented correctly.
4. For the hashmap problem, the use of separate chaining and a dummy node handles collisions and edge cases effectively.

Areas for Improvement:

1. In the hashmap problem, the getPrev method might be confusingly named because it returns the node before the target key (if found) or the last node in the list (if not found). Consider renaming it to something like find_previous_node or adding a comment to clarify its behavior.
2. The hashmap initialization uses a list of size 10000, which is acceptable, but it might be better to use a prime number for the bucket size to reduce collisions. However, this is not critical given the constraints.
3. In the queue problem, the pop method could call peek to ensure outStack has elements, which might make the code slightly more concise (as in the reference solution). However, the current implementation is also correct.