/in/foo.cc: In function 'void print(std::__cxx11::string)':
/in/foo.cc:8:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<=(a.size()-1)/2;i++)
          ~^~~~~~~~~~~~~~~~
/in/foo.cc:15:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<a.size() ;i++)
          ~^~~~~~~~~
/in/foo.cc: In function 'bool Find(std::__cxx11::string, std::__cxx11::string, std::__cxx11::string)':
/in/foo.cc:24:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<=(a.size()-1)/2;i++)
          ~^~~~~~~~~~~~~~~~
/in/foo.cc:31:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<a.size();i++)
          ~^~~~~~~~~
/in/foo.cc:38:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(j=0;j<=a.size()/2;j++)
            ~^~~~~~~~~~~~