Remove Nth Node From End of List .2.cpp

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode(int x) : val(x), next(NULL) {}
 * };
 */
class Solution {
public:
    ListNode *removeNthFromEnd(ListNode *head, int n) {
        ListNode*h=new ListNode(0),*p=h,*q=h;
        h->next=head;
        for(int i=0;i<n+1;i++)
            p=p->next;
        while(p!=NULL){
            p=p->next;
            q=q->next;
        }
        q->next=q->next->next;
        p=h->next;
        delete(h);
        return p;
    }
};