#include<bits/stdc++.h>
using namespace std;
struct nn
{
	double m;
	int ii;
}a[1050];
int cmp(nn a,nn b)
{
	return a.m<b.m;
}
int main()
{
	int n,k=0,p=0;
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>a[i].m;
		a[i].ii=i;
	}
	sort(a,a+n+1,cmp);
	for(int i=1;i<=n;i++)
	{
		cout<<a[i].ii<<" ";
	}
	for(int i=2;i<=n;i++)
	{
		k+=a[i-1].m;
		p+=k;
	}
	cout<<endl<<fixed<<setprecision(2)<<(double)p/n;
	return 0;
}
  
  求助，谢谢！！！