#include<iostream.h>
#define Num struct num
struct num{
    int n;
    Num *next;
};
Num *creat(int n)// 链表的创建
{
    cout<<"输入链表元素：";
    Num *head,*pb,*pf;
    for(int i=1;i<=n;i++)
    {
        pb=new Num;
        cin>>pb->n;
        if(i==1)
            pf=head=pb;
        else
            pf->next=pb;
        pb->next=NULL;
        pf=pb;
    }
    return head;
}
Num *get(Num *head,int n)//取链表中的元素
{
    Num *pb=head;
    for(int i=1;i<n;i++)
        pb=pb->next;
    return pb;
}
bool compare(Num *head,Num *p)//判断此链表中是否含有P元素
{
    Num *pb=head;
    while(pb->n!=p->n&&pb->next!=NULL)
        pb=pb->next;
    if(pb->n==p->n)
        return false;
    if(pb->n!=p->n&&pb->next==NULL)
        return true;
}
void insert(Num *&head,Num *p)//将P元素加到链表的未尾
{
    Num *pb=head;
    while(pb->next!=NULL)
        pb=pb->next;
    pb->next=p;
    p->next=NULL;
    pb=p;
}
void main()
{
    int a,b;
    Num *la,*lb;
    cout<<"输入la链表的长度：";
    cin>>a;
    la=creat(a);
    cout<<"输入lb链表的长度：";
    cin>>b;
    lb=creat(b);
    Num *p;
    for(int i=1;i<=b;i++)
    {
        p=get(lb,i);
        if(compare(la,p))
            insert(la,p);
    }
    Num *pb=la;
    cout<<"合并后的链表元素有：";
    while(pb!=NULL)
    {
        cout<<pb->n<<'\t';
        pb=pb->next;
    }
    cout<<endl;
}

就是这句有问题啊,还没想明白...

谢谢！！！麻烦再看看好像是那一句