//User function template for JAVA

/* Node is defined as

class Node

{

    int data;

    Node next;

    Node(int d) {data = d; next = null; }

}

*/

class Solution {

    //Function to check if the linked list has a loop.

    public static boolean detectLoop(Node head){

        // Add code here

        Node slow=head;

        Node fast=head.next;

        while(fast!=null && fast.next!=null){

            if(fast==slow)

            return true;

            slow=slow.next;

            fast=fast.next.next;

        }

        return false;

    }

}