Check If Circular Linked List
Basic Accuracy: 50.74% Submissions: 26749 Points: 1

Given a singly linked list, find if the linked list is circular or not. A linked list is called circular if it not NULL terminated and all nodes are connected in the form of a cycle. An empty linked list is considered as circular.

Example 1:

Input:
LinkedList: 1->2->3->4->5
(the first and last node is connected,
i.e. 5 --> 1)
Output: 1

Example 2:

Input:
LinkedList: 2->4->6->7->5->1
Output: 0

Your Task:
The task is to complete the function isCircular() which checks if the given linked list is circular or not. It should return true or false accordingly. (the driver code prints 1 if the returned values is true, otherwise 0)

Expected Time Complexity: O(N).
Expected Auxiliary Space: O(1).

Constraints:
1 <=Number of nodes<= 100

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