1 ListNode *ptr,*l;
2 l = new ListNode(0);//这才是正确的赋值姿势
3 ptr = l;//赋给的是地址
4 int up = 0,fg1 = 0,fg2 = 0;
5 //cout<<"r"<<endl;
6 while(1)
7 {
8 if(fg1 && fg2) break;
9 int a,b;
10 if(fg1) a = 0;
11 else a = l1 -> val;
12 if(fg2) b = 0;
13 else b = l2 -> val;
14 // cout<<a<<" "<<b<<endl;
15 l -> next = new ListNode( (a + b + up) % 10);
16 if(a + b + up >= 10) up = 1;
17 else up = 0;
18 if(!(l1 -> next)) fg1 = 1;
19 else l1 = l1 -> next;
20 if(!(l2 -> next)) fg2 = 1;
21 else l2 = l2 -> next;
22 l = l -> next;
23 }
24 if(up) l -> next = new ListNode(up);
25 return ptr -> next;
