bool isFileCorrect(string path)
{
    string inputline;
    regex regular("\\d\\s*");
    fstream fin(path, std::ios_base::in);
    bool isCorrect = true;
    while (!fin.eof() && isCorrect)
    {
        getline(fin, inputline);
        if (!(regex_match(inputline.c_str(), regular)))
            isCorrect = false;
    }
    fin.close();
    return isCorrect;
}