```cpp
#include <bitsdc++.h>
using namespace std;
int n, a;
int main() {
cin>>n;
int k;
k=0;
for(int i=1;i<=n<<1; i++)
{
cin>>a;
k += a*(n-(i-1>>1));
}
cout<< k-8*n*(n+1)/2<<endl;
return 0;
}
```
这样
by Who_Are_My @ 2024-02-05 16:38:43
@[Who_Are_My](/user/631574)
```cpp
#include <bitsdc++.h>
```
是什么鬼
不应该是这样的吗?
```cpp
#include<bits/stdc++.h>
```
by caojinyu0518 @ 2024-02-19 18:34:16