#include <iostream>

#include<stdio.h>

#include<stdlib.h>

using namespace std;

typedef struct key *ptr;

   struct key{

    int k;

     ptr next;

   };

int main()

{

ptr list=(ptr)malloc(20*sizeof(struct key));

ptr head;head=list;

head->k=0;

cout<<list->k<<endl;

head=head->next;

head->k=1;

cout<<list->next->k<<endl;

head=head->next;

head->k=2;

cout<<list->next->next->k<<endl;

head=head->next;

//head->k=0;

cout<<list->next->next->next->k<<endl;

cout<<"--------------gege--------------"<<endl;

ptr tmp=(ptr)malloc(sizeof(struct key));

tmp=list->next->next->next;

tmp->next=list->next->next;

tmp->next->next=list->next;

tmp->next->next->next=list;

list=tmp;

/*頭*/cout<<list->k<<endl;

/*1結點*/cout<<list->next->k<<endl;

/*2結點*/cout<<list->next->next->k<<endl;

/*尾*/cout<<list->next->next->next->k<<endl;

   return 0;

}