@[心之泪殇](/space/show?uid=85576)
```cpp
#include <iostream>
#include <cstdio>
#include <algorithm>
using namespace std;
int n;
double ans;
struct node
{
int id;
int time;
} a[1001];
bool cmp(node x, node y)
{
return x.time < y.time;
}
int main()
{
cin >> n;
for (int i = 1; i <= n; i++)
{
cin >> a[i].time;
a[i].id = i;
}
sort(a + 1, a + n + 1, cmp);
for (int i = 1; i <= n; i++)
cout << a[i].id << ' ';
cout << endl;
for (int i = 1; i <= n; i++)
{
ans += a[ n-i ].time * i;
}
printf("%.2lf\n", (double) ans / n);
return 0;
}
```
by Lates @ 2019-09-06 22:17:45
@[Lates](/space/show?uid=119062) 谢谢大佬
by yi_shang @ 2019-09-06 22:18:14
唉，我现在也就只能做pj-的题
by Lates @ 2019-09-06 22:22:50
@[Lates](/space/show?uid=119062) %%%
by yi_shang @ 2019-09-06 22:28:39
@[心之泪殇](/space/show?uid=85576) 前排orz巨佬
by 绝顶我为峰 @ 2019-09-06 22:32:28
@[绝顶我为峰](/space/show?uid=85682) ~~我**为何有骂人的冲动~~
by yi_shang @ 2019-09-06 22:41:09
@[心之泪殇](/space/show?uid=85576) ~~说你是大佬还不承认真是太fAKe惹QAQ~~
by 绝顶我为峰 @ 2019-09-06 22:43:21