foo.cc: In function 'void dtox(std::string&)':
foo.cc:5:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    5 |  for(int i=0;i<s.size();i++)
      |              ~^~~~~~~~~
foo.cc: In function 'void Find(int (*)[26], std::string&)':
foo.cc:11:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |  for(int i=0;i<s.size()-1;i++)
      |              ~^~~~~~~~~~~

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