@[RockyChen](/user/810200)
```
#include <bits/stdc++.h>
using namespace std;
struct node {
int id;
int t;
} a[1000001];
int cmp(node x, node y) {
if (x.t != y.t)
return x.t < y.t;
if (x.id != y.id) {
return x.id < y.id;
}
}
long long n, ans;
int main() {
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> a[i].t;
a[i].id = i;
}
sort(a + 1, a + n + 1, cmp);
for (int i = 1; i < n; i++) {
ans += (n - i) * a[i].t;
}
for (int i = 1; i <= n; i++) {
cout << a[i].id << " ";
}
cout << endl;
cout << fixed << setprecision(2) << ans * 1.0 / n ;
return 0;
}
by C13408964921 @ 2023-10-09 19:25:50
@[RockyChen](/user/810200)
```
int n, ans;//这没开long long
```
by C13408964921 @ 2023-10-09 19:27:41
@[C13408964921](/user/766647) ,谢谢帮助！
by RockyChen @ 2023-10-14 08:02:13
好了，此帖结
by RockyChen @ 2023-10-14 08:02:50