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Grokking the Coding Interview Patterns

Solution: Implement Queue Using Stacks

Explore how to implement a queue using two stacks by mastering methods such as Push, Pop, Peek, and Empty. Understand preserving the FIFO structure with stack operations and analyze time and space complexity for each method.

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Statement

Design a custom queue, MyQueue, using only two stacks. Implement the Push(), Pop(), Peek(), and Empty() methods:

  • Void Push(int x): Pushes element to the back of the queue.
  • Int Pop(): Removes and returns the element from the front of the queue.
  • Int Peek(): Returns the element at the front of the queue.
  • Boolean Empty(): Returns TRUE if the queue is empty. Otherwise FALSE.

You are required to only use the standard stack operations, which means that only the Push() to top, Peek() and Pop() from the top, Size(), and Is Empty() operations are valid.

Note: In some interview questions, Void Push(int x) and Int Pop() might be referred to as Void Enqueue(int x) and Int Dequeue(), respectively.

Constraints:

  • 1<=1 <= x <=100<= 100
  • A maximum of 100
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