`帮你修了下Markdown`
```cpp
#include<bits/stdc++.h>
using namespace std;
int main()
{
float k=0;
int m=0;
int total;
int a[10001];
int b[10001];
cin>>total;
for(int i=0;i<total;++i)
{
cin>>a[i];
b[i]=a[i];
a[i]=a[i]100001+i+1;
}
sort(a,a+total);
sort(b,b+total);
for(int i=0;i<total;++i)
{
cout<<a[i]%100001<<" ";
}
cout<<endl;
for(int i=total-2;i>=0;--i)
{
k=k+(i+1)b[m];
++m;
}
printf("%.2f",k/total);
return 0;
}
```
by 童年如作业 @ 2019-04-16 17:18:08