Sortare medii descrescator

#include <iostream>
#include <fstream>
#include <math.h>
#include <iomanip>

using namespace std;


struct elev
{
    char nume[50];
    float media_generala;
};

int main()
{
    int n;
    cin >> n;
    elev elevi[n];
    for (int i =0; i < n; i++) {
        cout << "Introduceti numele elevului: ";
        cin.ignore();
        cin.getline(elevi[i].nume, 50);
        cout << "Introduceti media elevului: ";
        cin >> elevi[i].media_generala;
    }

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n-1; j++) {
            if (elevi[j].media_generala < elevi[j+1].media_generala) {
                elev aux = elevi[j];
                elevi[j] = elevi[j+1];
                elevi[j+1] = aux;
            }
        }
    }

    for (int i = 0; i < n; i++) {
        cout << elevi[i].nume <<" ";
        cout <<fixed<<setprecision(2)<< elevi[i].media_generala << endl;
    }

    return 0;
}