Arkusz Pokazowy Zad 3. C++

#include <iostream>
#include <fstream>

using namespace std;
bool CzyPierwsza(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;
}
int potega(int a, int x, int M)
{
    int w = 1;
    int z = a;
    while (x > 0)
    {
        if (x % 2 == 1)
            w = w * z % M;
        z = z * z % M;
        x = x / 2;
    }
    return w;
}
int Nwd(int a, int b) {
    while (a != b) {
        if (a < b)
            swap(a, b);
        a -= b;
    }
    return a;
}
int main()
{
    ifstream in;
    in.open("liczby.txt");
    const int liczbaWejsc = 1000;

    int c_1 = 0, c_2 = 0, c_3 = 0;
    for (int i = 0; i < liczbaWejsc; i++) {
        int a, b, M;
        in >> M >> a >> b;
        if (CzyPierwsza(M))
            c_1++;
        if (Nwd(M, a) == 1)
            c_2++;
        bool daSie = false;
        for (int x = 0; x < M; x++) {
            if (potega(a, x, M) == b)
            {
                daSie = true;
                break;
            }

        }
        if (daSie)
            c_3++;
    }
    ofstream out;
    out.open("wyniki3.txt");
    cout << "3.3. " << c_1 << endl;
    cout << "3.4. " << c_2 << endl;
    cout << "3.5. " << c_3 << endl;
    out << "3.3. " << c_1 << endl;
    out << "3.4. " << c_2 << endl;
    out << "3.5. " << c_3 << endl;
    out.flush();
    out.close();
}