leetcode两数相加（c语言链表

leetcode两数相加（c语言链表

struct ListNode* addTwoNumbers(struct ListNode* l1, struct ListNode* l2){
    int x, y, num,flag=0;//flag是进位的值
    struct ListNode *p = l1, *q = l2;
    struct ListNode *cur = (struct ListNode*)malloc(sizeof(struct ListNode));
    cur->next = NULL;//整一个空链表
    struct ListNode *ret = cur;
    while(p != NULL || q != NULL){
        x = (p != NULL)? p->val :0;
        y = (q != NULL)? q->val :0;
        num = x + y + flag;
        flag = num /10;
        cur->next =(struct ListNode*)malloc(sizeof(struct ListNode));
        cur = cur->next;
        cur->val = num % 10;//是新建链表某位上的值
        cur->next=NULL;
        if(p!=NULL){
            p = p->next;
        }
        if(q!=NULL){
            q = q->next;
        }
    }
    if(flag>0){
        cur->next = (struct ListNode*)malloc(sizeof(struct ListNode));
        cur = cur->next;
        cur->val = 1;
        cur->next = NULL;
    }
    return ret->next;
}