#include <iostream> #include <algorithm> #include <iomanip> using namespace std; struct Person { int id; int time; }; bool cmp(Person a, Person b) { return a.time < b.time; } int main() { int n; cin >> n; Person p[1005]; for(int i=0; i<n; i++) { cin >> p[i].time; p[i].id = i+1; } sort(p, p+n, cmp); double total = 0; for(int i=0; i<n; i++) { cout << p[i].id << " "; total += p[i].time * (n-i-1); } cout << endl << fixed << setprecision(2) << total/n; return 0; }