#include<bits/stdc++.h>
using namespace std;
struct water{
	int num;
	int time;
} p[1010];
bool cmp(water a,water b){
if(a.time!=b.time)
return a.time<b.time;
return a.num<b.num;
}
int n,sum=0;
int main(){
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>p[i].time;
		p[i].num=i;
	}
	sort(p+1,p+n+1,cmp);
	for(int i=1;i<=n;++i){
		printf("%d ",p[i].num);
		sum+=i*p[n-i].time;
	}
	printf("\n%.2lf\n",1.0*sum/n);
	return 0;
}

求助只有82分，请大佬改一下，谢谢！！！