foo.cc: In function 'int Judge(std::string)':
foo.cc:9:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |  for(int i=0;i<a.size();i++)
      |              ~^~~~~~~~~
foo.cc:12:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |    for(int j=i;j<a.size();j++)
      |                ~^~~~~~~~~
foo.cc:19:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |    for(int j=i;j<a.size();j++)
      |                ~^~~~~~~~~
foo.cc:26:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |  for(int i=0;i<a.size();i++)
      |              ~^~~~~~~~~

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