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class ClearValue {public:    ListNode* clear(ListNode* head, int val) {        ListNode * p=head,*previous = NULL,*nxt=NULL;        while (head->val==val) {            nxt = head->next;            delete head;            head = nxt;        }        p = head->next;        previous = head;        while (p) {            nxt = p->next;            if(p->val ==val){                previous->next = nxt;                delete p;            }else                previous = p;            p = nxt;        }        return head;    }};

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