Design 2

[pratul2789]

Implemeted Queue using Stacks.
Designed a HashMap

[super30admin]

Your implementation of MyQueue using two stacks is correct and efficient. The code is clean and well-organized. The use of a private rebalance function to transfer elements from st1 to st2 when needed is a good practice.

Strengths:

• Correct implementation of all required methods.
• Amortized O(1) time complexity for operations.
• Clear and readable code.

Areas for improvement:

• Although your code is correct, you can avoid duplicating the rebalance call in both pop and peek by having pop call peek to get the top element and then remove it. However, this is a minor point and your current approach is acceptable.
• Note that the problem statement is for a general queue using stacks, and your solution is in C++. Make sure that you are submitting only the required code for the problem. The HashMap.cpp file seems to be for a different problem and should not be included.

One potential issue: in your rebalance function, you transfer all elements from st1 to st2. This is correct. However, ensure that you only do this when st2 is empty. Your condition in pop and peek checks for st2.empty(), which is correct.

Keep up the good work!

[super30admin]

Strengths:

• The solution is correct and efficient, with amortized O(1) time complexity for all operations.
• The code is well-structured and easy to understand.
• The use of a helper function (rebalance) to abstract the transfer operation is good practice.

Areas for Improvement:

1. The function name "rebalance" might be improved to something more specific, like "transferToOutputStack" or "moveElements", to clearly indicate what it does.
2. To avoid code duplication, consider having the pop() function utilize the peek() function to get the top value and then remove it. For example:
   int pop() {
   int val = peek();
   st2.pop();
   return val;
   }
   This way, the transfer logic is only in peek(), making the code more maintainable.
3. Although not required, you could add comments to explain the purpose of each stack (e.g., st1 for input, st2 for output) for clarity.

Note: The HashMap.cpp file was included but is not part of the queue problem. Make sure to submit only the relevant code for the problem you are solving.