#include<bits/stdc++.h>
using namespace std;
struct water{
	int N,T;
}p[1010];
bool cmp(water a,water b){
	if(a.T!=b.T)
		return a.T<b.T;
	return a.N<b.N;
}
int n;
long long S=0;
int main(){
	cin>>n;
	for (int i=1;i<=n;i++){
		cin>>p[i].T;
		p[i].N=i;
	}
	sort(p+1,p+n+1,cmp);
	for (int i=1;i<=n;i++){
		cout<<p[i].N<<" ";
		S +=i*p[n-i].T;
	}
	cout<<endl;
	cout<<1.0*S/n<<endl;
	return 0;
}

求大佬修改代码