``
inline int read(){
``
**然而**
``
double r1,s;
r1=read();
s=read();
``
by sophisticate @ 2018-09-10 13:25:18
@[__CDy](/space/show?uid=59602) ？？？
by 废物yehan @ 2018-09-11 12:37:13
@[__CDy](/space/show?uid=59602) 额我傻吊l
by 废物yehan @ 2018-09-11 12:38:47
```cpp
#include <iostream>
using namespace std;
int main(){
int n,m;
cin>>n>>m;
cout<<m*2-n;
return 0;
}
```
水题一道~
by Setoff @ 2018-10-08 21:47:22
至于这么麻烦吗
by comfort @ 2019-04-07 09:33:21
太复杂了，还不如用这个：
```cpp
#include<iostream>
using namespace std;
int main()
{
int s,r1;
cin>>r1>>s;
int r2=0;
r2=s*2-r1;
cout<<r2;
return 0;
}
```
by 异空龙 @ 2019-07-05 13:10:33