text: #include <iostream>
  #include <boost/filesystem.hpp>
  using namespace std;
  using namespace boost::filesystem;
  
  
  int main(int argc, char *argv[])
  {
    // std::cout << "输出示例" << std::endl;
    // std::cin >> v1;
    std::string dir_path = "./123";
    boost::filesystem::recursive_directory_iterator dir_p (dir_path);
    for (auto& x : dir_p) {
      std::cout << x.path() << std::endl;
    }
    return 0;
  }
  
  
  