输入太慢了，改scanf
by RE_Prince @ 2022-10-30 18:44:47
A了
```cpp
#include<bits/stdc++.h>
using namespace std;
int main()
{
ios::sync_with_stdio(0);
cin.tie(NULL);cout.tie(NULL);
double a,a1,sum1=0,sum2=0,n;
cin>>n;
for(int i=1;i<=n;i++)
{
cin>>a;
sum1+=a;
}
for(int i=1;i<=n;i++)
{
cin>>a1;
sum2+=a1;
}
printf("%.6lf",(sum1*3-sum2*2)/(sum1-sum2));
return 0;
}
```
by zhangjingxing2012 @ 2022-10-30 18:45:18
因为cin速度配置不行
by HeCao2008 @ 2022-10-30 18:58:31