Add Two Numbers

public class Solution {

    // http://www.cnblogs.com/springfor/p/3864493.html

    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {

        ListNode h = new ListNode(-1);

        ListNode l3 = h;

        if(l1==null || l2==null) return h.next;

        int  carry=0;

        

        while(l1!=null||l2!=null){

            if(l1!=null){

                carry += l1.val;

                l1 = l1.next;

            }

            if(l2!=null){

                carry += l2.val;

                l2 = l2.next;

            }

            l3.next = new ListNode(carry%10);

            carry = carry/10;

            l3 = l3.next;

        }

        if(carry==1) l3.next = new ListNode(1); // do not forget

        return h.next;

    }

}

 我觉得题意很模糊，什么叫“reverse”

例子如下

Input: (2 -> 4 -> 3) + (4 -> 6 -> 4)
Output: 6 -> 0 -> 8