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Circular Linked List (Function Problem)

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.

Note  that this problem is different from cycle detection problem, here all nodes have to be part of cycle.



You have to complete the method which takes one argument: the head of the linked list. You should not read any input from stdin/console.
The struct Node has a data part which stores the data and a next pointer which points to the next element of the linked list. 
There are multiple test cases. For each test case, this method will be called individually.

The function should return true if the given linked list is circular, else false.

1 <=T<= 50
1 <=N<= 100
1 <=value<= 1000


5 1      
1 2 3 4 5
6 0
2 4 6 7 5 1




Note:The Input/Ouput format and Example given are used for system's internal purpose, and should be used by a user for Expected Output only. As it is a function problem, hence a user should not read any input from stdin/console, and should not print anything on stdout/console. The task is to complete the function specified, and not to write the full code.

** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Amit Khandelwal, Harshit Sidhwa

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