LeetCode Solutions : Rotate List

Given a list, rotate the list to the right by k places, where k is non-negative.

For example:
Given 1->2->3->4->5->NULL and k = 2,
return 4->5->1->2->3->NULL.

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) {
 *         val = x;
 *         next = null;
 *     }
 * }
 */
public class Solution {
    public ListNode rotateRight(ListNode head, int n) {
		if(head==null||head.next==null)
			return head;
        ListNode rear=head;
		int len=1;
		while(rear.next!=null){
			rear=rear.next;		
			len++;
		}
		rear.next=head;
		int breakPoint=len-n%len;
		rear=head;		
		int count=1;
		while(count<breakPoint){
			rear=rear.next;
			count++;
		}
		head=rear.next;
		rear.next=null;
		return head;
    }
}