Question 1

How do you implement a queue using two stacks?

Accepted Answer

To implement a queue using two stacks, you can use one stack for enqueuing and another for dequeuing. When you need to dequeue, if the dequeue stack is empty, you pop all elements from the enqueue stack and push them onto the dequeue stack. This reverses the order, effectively simulating a queue.

Question 2

What are the advantages of using a deque?

Accepted Answer

A deque (double-ended queue) allows for efficient insertion and deletion at both ends, which can be useful in a variety of applications, such as implementing a sliding window maximum algorithm.

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