链表A+B

/*
struct ListNode {
    int val;
    struct ListNode *next;
    ListNode(int x) : val(x), next(NULL) {}
};*/
class Plus {
public:
    ListNode* plusAB(ListNode* a, ListNode* b) {
        ListNode* head =new ListNode(0);
         ListNode* cur = head;
        int plus = 0;
        while(a||b)
        {
            int num = (a?a->val:0)+(b?b->val:0)+plus;
            plus = num /10;
            num = num % 10;

            cur->next =new ListNode(num);
            cur = cur->next;
            if(a)
                a =a->next;
            if(b)
                b=b->next;
        }
        if(plus)
            cur->next =new ListNode(plus);
        return head->next;
    }
};