Untitled

void print(int id, std::string::size_type n, std::string const& s)
{
    std::cout << id << ") ";
    if (std::string::npos == n)
        std::cout << "not found! n == npos\n";
    else
        std::cout << "found @ n = " << n << ", substr(" << n << ") = "
                  << std::quoted(s.substr(n)) << '\n';
}