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/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */

// be attention to the cast of k >= length 
public class Solution {
    public ListNode rotateRight(ListNode head, int n) {
        if (head==null||head.next==null) return head;
        ListNode dummy=new ListNode(0);
        dummy.next=head;
        ListNode fast=dummy,slow=dummy;

        int i;
        for (i=0;fast.next!=null;i++)//Get the total length 
            fast=fast.next;

        for (int j=i-n%i;j>0;j--) //Get the i-n%i th node
            slow=slow.next;

        fast.next=dummy.next; //Do the rotation
        dummy.next=slow.next;
        slow.next=null;

        return dummy.next;
    }
}