public class Solution { public ListNode addTwoNumbers(ListNode l1, ListNode l2) { ListNode ret = new ListNode(0); ListNode cur = ret; int sum = 0; while(true) { if(l1 != null) { sum += l1.val; l1 = l1.next; } if(l2 != null) { sum += l2.val; l2 = l2.next; } cur.val = sum % 10; sum /= 10; if(l1 != null || l2 != null || sum != 0) { //cur = (cur.next = new ListNode(0)); cur.next = new ListNode(0); cur = cur.next; } else { break; } } return ret; } }
大牛写的就是精简