数据有重复（和题面说的不一样）。
by wangmingwei @ 2022-08-29 16:38:08
@[sb114514](/user/460468) 可以加个数组判重。
by wangmingwei @ 2022-08-29 16:38:26
@[sb114514](/user/460468) 我把你不用的 `c` 数组变成 `bool` 类型的用来判重。
```cpp
#include <bits/stdc++.h>
using namespace std;
int n, a[10010], b[10010];
bool c[10010];
int main()
{
cin >> n;
for (int i = 1; i <= n; i++)
{
cin >> a[i];
b[i] = a[i];
}
sort(a + 1, a + n + 1);
double num = 0;
for (int i = 1; i <= n; i++)
{
for (int j = 1; j <= n; j++)
{
if (b[j] == a[i])
{
// num+=a[i];
if (c[j])
continue;
cout << j << ' ';
c[j] = true;
num += (n - i) * a[i];
break;
}
}
}
printf("\n%.2f", num / n);
return 0;
}
```
by wangmingwei @ 2022-08-29 16:39:58
谢谢
by CuteMm @ 2022-08-29 21:55:47