How do I combine two queues?

How do I combine two queues?

While both queues aren’t empty, dequeue an item from A and enqueue it to newQ. Then dequeue an item off of queue B. If either of the queues (A or B) are empty, dequeue the rest of the other queue and enqueue each element onto newQ.

How do you make a stack with two queues?

To construct a stack using two queues (q1, q2), we need to simulate the stack operations by using queue operations:

1. push (E element) if q1 is empty, enqueue E to q1. if q1 is not empty, enqueue all elements from q1 to q2, then enqueue E to q1, and enqueue all elements from q2 back to q1.
2. pop. dequeue an element from q1.

How to merge two queues in java?

Here goes the key steps:

1. There are two sorted queues A, B, and an empty queue C.
2. Peek two items from A, B if not empty.
3. Poll and Insert the greater value to the empty queue.
4. Return to step 2.
5. Insert the remaining items into C if A or B is not empty.

How do you add two queues in C++?

Merge two queues in C++ We pop elements one by one and push them in the final queue. Suppose the size of both the queue is not the same then after popping some elements one of them will be empty. At this time all the elements of the non-empty queue are inserted in the final queue.

Can a stack be implemented using 2 queues?

Implementation of a stack using two queues Likewise, a queue can be implemented with two stacks, a stack can also be implemented using two queues. So, we need to implement push(),pop() using DeQueue(), EnQueue() operations available for the queues.

Can two stacks be implemented using one queue?

A queue can be implemented using two stacks.

Is it possible to implement multiple stacks in a queue?

Answer: yes, it is possible to implement multiple stacks in a Queue. Implementing two Stacks in a Queue. (1) When calling the enqueue method, simply push the elements into the stack 1.

Can we convert queue into stack?

A queue is normally a FIFO1 container, while a stack is LIFO2. This means that you cannot just copy the data in sequential order from your queue to your stack, since that will make the elements appear in the “wrong” order (following your description).