计算机 c/c++ 约瑟夫环

#include<iostream>
#include<string>
using namespace std;
int n;
struct stu
{
int num;
int secret;
stu *next;
};
stu *pl=NULL;
stu *pend=NULL;
stu *head=NULL;
stu *creatlist()
{   int i=1;


pl=new stu;
pend=new stu;
cout<<"请输入人数"<<endl;
cin>>n;
cout<<"请输入密码"<<endl;
cin>>pl->secret;
pl->num=i;
head=pl;

while(i!=n)
{ 
pend->next=pl;
pend=pl;