مسألة برمجية للتدريب !

بسيطة سطرين.

#include <iostream>
#include <algorithm>
#include <vector>

using namespace std;

int main() {
    int n_fd=0, s_f=0, n_fd_n=0;
    vector<int> sizes_drivers;

    cout << "Enter flash drivers number: ";
    cin >> n_fd;
    cout << "Enter file size: ";
    cin >> s_f;
    for(int i=0,x=0;i++<n_fd;){
        cout << "Enter size for flash driver number[" << i << "]: ";
        cin >> x;
        sizes_drivers.push_back(x);
    }

    sort(sizes_drivers.begin(),sizes_drivers.end());

    for(int i=0,x=0;i++<n_fd;){
        x+=sizes_drivers[i];
        if(x>=s_f){
            n_fd_n = i+1;
            break;
        }
    }
    cout << "You need " << n_fd_n << " flash drivers." << endl;

    return 0;
}