程序代码：

void difference(Linklist LA,Linklist LB)
{
    Linklist pre,p,q,r;
    pre = LA;
    p = LA->next;
    while(p != NULL)
    {
        q = LB->next;
        while(q != NULL && q->data != p->data)
            q = q->next;
        if(q != NULL)
        {
            r = p;
            pre->next = p->next;
            p = p->next;
            free(r);
        }
        else
        {
            pre = p;
            p = p->next;
        }
    }
}