题意:
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
代码:
/**
* 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 *link1=l1,*link2=l2,*linkAns=new ListNode(0);
int carry=0;
ListNode *newLink=linkAns;
while(link1!=NULL || link2!=NULL){// 这种方法简便
if(link1!=NULL){
carry+=link1->val;
link1=link1->next;
}
if(link2!=NULL){
carry+=link2->val;
link2=link2->next;
}
ListNode *link=new ListNode(carry%10);
carry/=10;
newLink->next=link;
newLink=link;
}
if(carry){
ListNode *link=new ListNode(carry);
newLink->next=link;
}
return linkAns->next;
}
};