foo.cc: In function 'bool Judge(int, int, std::string, int)':
foo.cc:8:31: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
    8 |         if(animal.find('D', 0)==-1)
      |            ~~~~~~~~~~~~~~~~~~~^~~~
foo.cc:13:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |         for(int i=0; i<animal.length(); i++)
      |                      ~^~~~~~~~~~~~~~~~
foo.cc:17:49: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   17 |                 if(cat==0 && animal.find('D', i)!=-1)
      |                              ~~~~~~~~~~~~~~~~~~~^~~~

[Hydro](https://hydro.ac)提供评测服务