static std::vector<char> readFile(const char* filename)
{
  std::ifstream file;
  file.open(filename, std::ios::in);
  if(!file.good())
    throw std::runtime_error("Cannot open input file.");
 
  file >> std::noskipws;
  std::vector<char> result;
  std::copy(std::istream_iterator<char>(file), std::istream_iterator<char>(), std::back_inserter(result));
  result.push_back('\0');
  if(!file.eof() && file.fail())
    throw std::runtime_error("I/O error when reading the input file.");
  return result;
}

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