+1，资瓷
```cpp
#include<iostream>
#include<string>
using namespace std;
int main()
{
//while(true)
int data[20001]={0},n,data2[20001]={0},res=1;
cin>>n;
for(int i=1;i<=2*n;i++)
{
data[i]=i;
}
start: for(int i=1;i<=n;i++)
{
data2[i*2]=data[i];
data2[i*2-1]=data[n+i];
}
for(int i=1;i<=2*n;i++)
data[i]=data2[i];
for(int i=2;i<=2*n;i++)
if(data[i]-data[i-1]!=1){res++;goto start;}
cout<<res<<endl;
return 0;
}
```
**为什么不给过？？？**
by Mosklia @ 2017-12-10 16:53:21
第七个点n=0
by Zafkiel @ 2017-12-10 17:10:45