public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
        ListNode dummy = new ListNode(0);
        ListNode p1 = l1;
        ListNode p2 = l2;
        ListNode cur = dummy;
        int sum = 0;
        while (p1 != null || p2 != null) {
            if (p1 != null) {
                sum += p1.val;
                p1 = p1.next;
            }
            if (p2 != null) {
                sum += p2.val;
                p2 = p2.next;

            }
            cur.next = new ListNode(sum % 10);
            cur = cur.next;
            sum = sum / 10;    
        }
        if(sum > 0){
            cur.next = new ListNode(1);
        }
        return dummy.next;
    }

 

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