Detect Cycle

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Problem Statment
You’re given the pointer to the head node of a linked list. Find whether the list contains any cycle (or loop). A linked list is said to contain cycle if any node is re-visited while traversing the list. The head pointer given may be null meaning that the list is empty.

Input Description
You have to complete the int HasCycle(Node* head) method which takes one argument - the head of the linked list. You should NOT read any input from stdin/console. Number of nodes in a linked list doesn't exceed 100.

Output Description
Check whether the linked list has a cycle and return 1 if there is a cycle. Otherwise, return 0. Do NOT print anything to stdout/console.

Sample Input

1 --> NULL
1 --> 2 --> 3
^ |
| |

Sample Output


Code Editor

  //Your code goes here.