You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.
Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8
linked list. 不要犯低级错误。。。
/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode(int x) : val(x), next(NULL) {}
* };
*/
class Solution {
public:
ListNode *addTwoNumbers(ListNode *l1, ListNode *l2) {
ListNode *head=new ListNode(-1);
ListNode *tmp=head;
int val=0, carry=0;
while(l1 || l2)
{
val=0;
if (l1)
{
val+=l1->val;
l1=l1->next;
}
if (l2)
{
val+=l2->val;
l2=l2->next;
}
tmp->next=new ListNode( (val+carry)%10);
carry=(val+carry)/10;
tmp=tmp->next;
}
if (carry)
tmp->next= new ListNode(carry);
tmp=head;
head=head->next;
delete tmp;
return head;
}
};