```c
#include <bits/stdc++.h>
using namespace std;
struct data
{
int bh,t;
} a[1005];
bool cmp(data x,data y)
{
return x.t<y.t;
}
int main()
{
int n;
double ans=0;
cin>>n;
for(int i=1;i<=n;i++)
{
cin>>a[i].t;
a[i].bh=i;;
}
sort(a+1,a+n+1,cmp);
for(int i=1;i<=n;i++)
{
cout<<a[i].bh<<" ";
ans=ans+a[i].t*(n-i);
}
cout<<endl;
printf("%0.2f",ans/n);
return 0;
}
```
by lzh20220920 @ 2023-04-16 12:54:06
@[lzh20220920](/user/803757) thanks
by kevin3 @ 2023-04-16 14:39:37
@[kevin3](/user/735452) NO thanks
by lzh20220920 @ 2023-07-03 15:41:32