C++ 03.11.2022 Factorization

#include <iostream>
#include <fstream>
#include <vector>
using namespace std;

bool IsPrime(int n) {
    if (n < 2)
        return false;
    if (n == 2)
        return true;
    for (int i = 2; i < n; i++) {
        if (n % i == 0)
            return false;
    }
    return true;
}
vector<int> Factorize(int n) {
    vector<int> ret;
    int i = 2;
    while (n > 1) {
        if (n % i == 0) {
            ret.push_back(i);
            n /= i;
        }
        else
            i++;
    }
    return ret;
}
int main()
{
    setlocale(LC_ALL, "Polish");
    ifstream ff;
    ofstream out;
    out.open("wynik.txt");
    ff.open("liczby.txt");
    int c=0;
    int maks = 0;
    int liczba_maks = 0;
    for (int i = 0; i < 500; i++) {
        int a;
        ff >> a;
        /*if (!IsPrime(a)) {
            cout << a << endl;
            out << a << endl;
            c++;
        }*/
        if (!IsPrime(a)) {
            vector<int> liczby = Factorize(a);
            int suma = 0;
            for (int l : liczby)
                suma += l;
            if (suma > maks)
            {
                maks = suma;
                liczba_maks = a;
            }

            cout << a << ": ";
            for (int b : liczby) {
                cout << b << " ";
            }
            cout << endl;
            c++;
        }
    }
    cout << "Liczba, o największej sumie czynników to: ";
    cout << liczba_maks <<endl;
    out.flush();
    out.close();
}