Queue Design Problems
In the previous lessons, we have discussed various implementations of queues and explored different operations associated with queues. Now, let's dive into solving design problems related to queues.
Design Problem 1: Implement a Circular Queue
Problem Statement: Design and implement a circular queue data structure. The circular queue should support the following operations:
enQueue: Insert an element into the circular queue. If the queue is full, return false;deQueue: Delete an element from the circular queue. If the queue is empty, return false;isEmpty: Check whether the circular queue is empty or not;isFull: Check whether the circular queue is full or not;Front: Get the front item from the queue;Rear: Get the last item from the queue.
You can try solving this design problem yourself or refer to the solution provided in the code snippet above.
Design Problem 2: Implement a Priority Queue
Problem Statement: Design and implement a priority queue data structure. The priority queue should support the following operations:
insert: Insert an element into the priority queue;delete: Delete the highest priority element from the priority queue;isEmpty: Check whether the priority queue is empty or not;
Consider using a heap data structure to implement the priority queue. You can try solving this design problem yourself or refer to relevant resources.
These are just a couple of examples of design problems related to queues. As you continue to explore data structures and algorithms, you'll come across many more interesting design problems involving queues.
Feel free to research and attempt other queue design problems outside of this course to further strengthen your problem-solving skills.
xxxxxxxxxx}import java.util.Stack;class QueueUsingStacks { private Stack<Integer> stack1; private Stack<Integer> stack2; public QueueUsingStacks() { stack1 = new Stack<>(); stack2 = new Stack<>(); } public void enqueue(int item) { stack1.push(item); } public int dequeue() { if (stack1.isEmpty() && stack2.isEmpty()) { throw new RuntimeException("Queue is empty!"); } if (stack2.isEmpty()) { while (!stack1.isEmpty()) { stack2.push(stack1.pop()); } } return stack2.pop(); }