Add Two Numbers(链表)

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：

vector<int> v1;
vector<int> v2;
int num1;
int num2;
struct ListNode {
    int val;
    ListNode *next;
    ListNode(int x) : val(x), next(NULL) {}
};
class Solution {
public:
    void insertAtTail(ListNode* &reslist,int val)
    {
        ListNode* p=reslist;
        while (p->next)
            p=p->next;
        ListNode* newNode=(ListNode*)malloc(sizeof(ListNode));
        newNode->val=val;
        newNode->next=p->next;
        p->next=newNode;

    }
    ListNode *addTwoNumbers(ListNode *l1, ListNode *l2) {
        if(l1==NULL&&l2==NULL) return NULL;
        ListNode* reslist=NULL;
        int jinwei=0;
        while(l1!=NULL&&l2!=NULL){
            if((l1->val+l2->val+jinwei)<10){
                if(reslist==NULL){
                    reslist=(ListNode*)malloc(sizeof(ListNode));
                    reslist->val=l1->val+l2->val+jinwei;
                    reslist->next=NULL;
                }else{
                    insertAtTail(reslist,l1->val+l2->val+jinwei);
                }
                jinwei=0;
            }else{
                if(reslist==NULL){
                    reslist=(ListNode*)malloc(sizeof(ListNode));
                    reslist->val=l1->val+l2->val+jinwei-10;
                    reslist->next=NULL;
                }else{
                    insertAtTail(reslist,l1->val+l2->val+jinwei-10);
                }
                jinwei=1;
            }
            l1=l1->next;
            l2=l2->next;
        }
        while(l1!=NULL){
            if(l1->val+jinwei<10){
                insertAtTail(reslist,l1->val+jinwei);
                jinwei=0;
            }else{
                insertAtTail(reslist,l1->val+jinwei-10);
                jinwei=1;
            }
            l1=l1->next;
        }
        while(l2!=NULL){
            if(l2->val+jinwei<10){
                insertAtTail(reslist,l2->val+jinwei);
                jinwei=0;
            }else{
                insertAtTail(reslist,l2->val+jinwei-10);
                jinwei=1;
            }
            l2=l2->next;
        }
        if(l1==NULL&&l2==NULL&&jinwei!=0){
            insertAtTail(reslist,jinwei);
        }
        return reslist;
    }
};

void CreateListHead(ListNode* &head, int n) 
{
    int j=0;
    head = (ListNode*)malloc(sizeof(ListNode));
    head->next=NULL;  
    head->val=v1[j++];
    ListNode* p=head;
    for (int i=1;i<n;++i)
    {
        ListNode* newNode;
        newNode = (ListNode*)malloc(sizeof(ListNode));
        p->next=newNode;
        newNode->next=NULL;  
        newNode->val=v1[j++];
        p=p->next;
    }
}
void CreateListHead2(ListNode* &head, int n) 
{
    int j=0;
    head = (ListNode*)malloc(sizeof(ListNode));
    head->next=NULL;  
    head->val=v2[j++];
    ListNode* p=head;
    for (int i=1;i<n;++i)
    {
        ListNode* newNode;
        newNode = (ListNode*)malloc(sizeof(ListNode));
        p->next=newNode;
        newNode->next=NULL;  
        newNode->val=v2[j++];
        p=p->next;
    }
}
int main()
{
    freopen("C:\Users\Administrator\Desktop\a.txt","r",stdin);
    cin>>num1;
    for (int i=0;i<num1;++i)
    {
        int temp;
        cin>>temp;
        v1.push_back(temp);
    }
    cin>>num2;
    for (int i=0;i<num2;++i)
    {
        int temp;
        cin>>temp;
        v2.push_back(temp);
    }
    ListNode* head1=NULL;
    CreateListHead(head1,num1);
    ListNode* head2=NULL;
    CreateListHead2(head2,num2);
    Solution so;
    ListNode* res=so.addTwoNumbers(head1,head2);
    return 0;
}