我没用数组
希望对你有帮助（求关QAQ）
```cpp
#include<bits/stdc++.h>
using namespace std;
long long n , z = 0 , y = 0 , ans = 0 , sum = 0 , h = 0;
int main(){
cin >> n;
for(int i = 1 ; i <= n ; i++){
int a;
cin >> a;
z += a;
}
for(int i = 1 ; i <= n ; i++){
int b;
cin >> b;
y += b;
}
h = z - y;
cout << fixed << setprecision(6) <<1.0 * (z * 3 - y * 2) / h;
return 0;
}
```
by 2011Andy @ 2022-11-02 20:31:53
谢谢
by moqwq @ 2022-11-02 20:33:53
@[moqwq](/user/456394)
n<=1e7，所以数组开小了。
by WA_sir @ 2022-11-02 20:39:34