Question

Implement in Java the Queue abstract data type using a singly-linked list with only one access pointer (instead of two: Q.head and Q.tail). ENQUEUE and DEQUEUE operations should take constant time. Assume elements are integers. Briefly describe your implementation in the report.

Clear solution with step by step and explaining it please.

Answer 1

To implement a Queue abstract data type using a singly-linked list with one access pointer, you can use a circular linked list.

Step-by-step explanation:

To implement a Queue abstract data type using a singly-linked list with only one access pointer, we can use a circular linked list. In this implementation, the access pointer will point to the last element in the queue, and each element will have a reference to the next element.

When performing the ENQUEUE operation, we create a new node and update the next reference of the current last element to point to the new node. We then update the access pointer to the new node, making it the new last element of the queue.

For the DEQUEUE operation, we update the next reference of the first element in the queue to skip over the second element. We then update the access pointer to point to the second element, effectively removing the first element from the queue.