Rotate List

class Solution {public:    ListNode *rotateRight(ListNode *head, int k)    {        if(head==NULL)return NULL;        ListNode *p=head;        int n=0;        while(p->next)        {            p=p->next;            n++;        }        n++;        k=k%n;        p->next=head;        ListNode *q=head;        for(int i=0;i
     
      next;        head=q->next;        q->next=NULL;            return head;    }};