标题:线性表中单链表的前m个元素与剩下的元素互换,请问void Exchange_L(LinkQue ...
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线性表中单链表的前m个元素与剩下的元素互换,请问void Exchange_L(LinkQueue<int> L, int m )里面有什么问题?
#include<iostream>
#include<cstdlib>
using namespace std;

template<class ElemType>
struct LinkQueueNode
{
    ElemType data;
    LinkQueueNode<ElemType> *next;
    LinkQueueNode(LinkQueueNode<ElemType> *ptr = NULL)
    {
        next = ptr;   
    }
    LinkQueueNode(ElemType &item, LinkQueueNode<ElemType> *ptr = NULL)//构造函数2,用于构造其他函数
    {
        data = item;
        next = ptr;
    }
    ElemType getData()
    {
        return data;
    }
    void SetLink(LinkQueueNode<ElemType> *link)
    {
        next = link;    //修改节点的next域
    }
    void SetData(ElemType value)
    {
        data = value;    //修改节点中的data域
    }
};

template<class ElemType>
class LinkQueue
{
private:
    LinkQueueNode<ElemType> *front;
    LinkQueueNode<ElemType> *rear;
    int length;
public:
    LinkQueue();
    ~LinkQueue()
    {
        LinkQueueDestroy();
    }
    bool LinkQueueDestroy();//销毁链表
    bool LinkQueueClear();//清空链表
    int QueueLength()const
    {
        return length;    //返回长度
    }
    bool QueueisEmpty()const; //判空
    bool deQueue(ElemType &e);//出队
    void enQueue(ElemType e);//入队
    LinkQueueNode<ElemType> *GetFront()
    {
        return front;    //获取头结点指针
    }
    ElemType GetFrontData()
    {
        return front->data;    //头元素
    }
    LinkQueueNode<ElemType> *GetRear()
    {
        return rear;    //获取尾指针
    }
    bool QueueTraverse()const;
    void SetFront(LinkQueueNode<ElemType> *p)
    {
        front = p;
    }
};

template<class ElemType>
LinkQueue<ElemType>::LinkQueue()
{
    front = rear = new LinkQueueNode<ElemType>;
    if(!front) exit(1);
    front->next = NULL;
    length = 0;
}

template<class ElemType>
bool LinkQueue<ElemType>::QueueisEmpty()const
{
    if(front == rear) return true;
    return false;
}

template<class ElemType>
bool LinkQueue<ElemType>::deQueue(ElemType &e)
{
    if(front == rear) return false;
    LinkQueueNode<ElemType> *p;
    p = front->next;
    e = p->data;
    front->next = p->next;
    length--;
    if(rear == p) rear = front;
    delete(p);
    return true;
}

template<class ElemType>
void LinkQueue<ElemType>::enQueue(ElemType e)
{
    LinkQueueNode<ElemType> *s;
    s = new LinkQueueNode<ElemType>;
    s->data = e;
    s->next = NULL;
    rear->next = s;
    rear = s;
    length = length + 1;
}

template<class ElemType>
bool LinkQueue<ElemType>::QueueTraverse()const
{
    LinkQueueNode<ElemType> *p;
    p = front->next;
    while(p)
    {
        cout << p->data << " ";
        p = p->next;
    }
    cout << endl;
    return true;
}

template<class ElemType>
bool LinkQueue<ElemType>::LinkQueueDestroy()
{
    LinkQueueNode<ElemType> *p;
    if(!front) return false;
    while(front->next)
    {
        p = front->next;
        front->next = p->next;
        delete p;
    }
    front = rear = NULL;
    return true;
}

template<class ElemType>
bool LinkQueue<ElemType>::LinkQueueClear()
{
    LinkQueueNode<ElemType> *p;
    if(!front) return false;
    while(front->next)
    {
        p = front->next;
        front->next = p->next;
        delete p;
    }
    return true;
}

void Exchange_L(LinkQueue<int> L, int m )
{
    LinkQueueNode<int> *p, *q, *pr;
    p = new LinkQueueNode<int>;
    q = new LinkQueueNode<int>;
    pr = new LinkQueueNode<int>;
    p = L.GetFront();
    q = L.GetRear();
    q -> next = p;
    int j = 0;
    p = L.GetFront()->next;
    pr = L.GetFront()->next;
    while(j < m)
    {
        j++;
        p = p->next;
        pr = pr->next;
    }
    p -> next = NULL;
    //pr = pr->next;
    L.SetFront(pr);
}

int main()
{
    int n;
    while(cin >> n)
    {
        int i, a;
        LinkQueue<int> L;
        for(i = 0; i < n; i++)
        {
            cin >> a;
            L.enQueue(a);
        }
        L.QueueTraverse();
        int m;
        cin >> m;
        Exchange_L(L, m);
        L.QueueTraverse();
    }
    return 0;
}
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2017-10-04 12:12



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