void makeTrail(std::ofstream& ofs, const int64_t& amountOfVertices) {
    size_t v = 0;
    while ((v + 1) < amountOfVertices)
        ofs << v << ' ' << ++v << std::endl;
}
void makeTour(std::ofstream& ofs, const int64_t& amountOfVertices) {
    size_t v = 0;
    while (true) {
        ofs << v << ' ';
        if ((v + 1) != amountOfVertices)
            ofs << ++v << std::endl;
        else {
            ofs << '0' << std::endl;
            break;
        }
    }
}