SDE - 2

You are given a Circular Linked List of integers, and an integer, 'key'.

You have to write a function that finds the given key in the list and deletes it. If no such key is present, then the list remains unchanged.

For Example :

This is a visualization of the Circular Linked List, represented by:
1 2 3 4 5 -1

Note :

The Circular Linked List before/after deletion may happen to be empty. In that case, only print -1.

All integers in the list are unique.

Implement a Queue Data Structure specifically to store integer data using a Singly Linked List or an array.

You need to implement the following public functions :

1. Constructor: It initializes the data members as required.

2. enqueue(data): This function should take one argument of type integer. It enqueues the element into the queue.

3. dequeue(): It dequeues/removes the element from the front of the queue and in turn, returns the element being dequeued or removed. In case the queue is empty, it returns -1.

4. front(): It returns the element being kept at the front of the queue. In case the queue is empty, it returns -1.

5. isEmpty(): It returns a boolean value indicating whether the queue is empty or not.

Operations Performed on the Queue :

Query-1(Denoted by an integer 1): Enqueues integer data to the queue.

Query-2(Denoted by an integer 2): Dequeues the data kept at the front of the queue and returns it to the caller, return -1 if no element is present in the queue.

Query-3(Denoted by an integer 3): Fetches and returns the data being kept at the front of the queue but doesn't remove it, unlike the dequeue function, return -1 if no element is present in the queue.

Query-4(Denoted by an integer 4): Returns a boolean value denoting whether the queue is empty or not.

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