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Grokking the Coding Interview Patterns in C#

Solution: Implement Queue Using Stacks

Understand how to implement a queue data structure using two stacks while preserving FIFO order. Learn to write Push, Pop, Peek, and Empty methods with clear time and space complexity analysis to prepare for coding interviews.

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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
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