这个...
这道题它真的需要那么麻烦吗
------------
double s,r1,r2;
cin>>r1>>s;
cout<<s*2-r1;
by fengzai_ @ 2023-09-19 19:00:38
你试着改成从复数开始枚举，从 $-1000$到 $1000$ 看看
by 2011__SJY @ 2023-09-19 19:02:20
@[xuziheng123](/user/970297) @[liruizhou123](/user/1053122) 开long long 没用，我试了，要改成从复数开始枚举
by 2011__SJY @ 2023-09-19 19:04:39
@[2011__SJY](/user/969257)
你们都搞复杂了吧
```c
#include <iostream>
using namespace std;
int main(){
int a,b;
cin>>a>>b;
cout<<b*2-a;
}
```
by penguin_is_cool @ 2023-10-23 21:33:58
@[penguin_is_cool](/user/1065176) 啊？
by 2011__SJY @ 2023-10-24 20:06:55