懂了，谢谢你
by Hja2004 @ 2024-02-15 14:45:14
```cpp
#include<bits/stdc++.h>
using namespace std;
int n;
struct water{
int d;
int s;
}a[1000010];
bool cmp(water a,water b){
return a.s>=b.s;
}
long long x=0;
int main(){
cin>>n;
for(int i=0;i<n;i++){
cin>>a[i].s;
a[i].d=i+1;
}
sort(a,a+n,cmp);
for(int i=0;i<n;i++){
x+=i*a[i].s;
printf("%d ",a[n-1-i].d);
}
printf("\n%.2lf",x/double(n));
return 0;
}
```
by lijunyi2012 @ 2024-02-20 08:46:42