GPT 3.5的题解

#include <iostream>
#include <algorithm>
#include <iomanip>
using namespace std;

struct Person {
    int id;
    int time;
};

bool compare(Person a, Person b) {
    return a.time < b.time;
}

int main() {
    int n;
    cin >> n;
    
    Person people[n];
    for (int i = 0; i < n; i++) {
        cin >> people[i].time;
        people[i].id = i + 1;
    }
    
    sort(people, people + n, compare);
    
    cout << people[0].id;
    double totalWaitTime = 0;
    for (int i = 1; i < n; i++) {
        cout << " " << people[i].id;
        totalWaitTime += people[i-1].time * (n - i);
    }
    
    double averageWaitTime = totalWaitTime / n;
    cout << endl << fixed << setprecision(2) << averageWaitTime;
    
    return 0;
}