/in/foo.cc: In function 'int main()':
/in/foo.cc:30:20: warning: array subscript has type 'char' [-Wchar-subscripts]
   tag_name[temp1[1]].push_back(tag);
                    ^
/in/foo.cc:32:23: warning: array subscript has type 'char' [-Wchar-subscripts]
   tag_address[temp2[0]].push_back(tag);
                       ^
/in/foo.cc:48:37: warning: array subscript has type 'char' [-Wchar-subscripts]
     for (auto i : tag_name[buffer[1]])
                                     ^
/in/foo.cc:63:40: warning: array subscript has type 'char' [-Wchar-subscripts]
     for (auto i : tag_address[buffer[0]])
                                        ^
/in/foo.cc:38:6: warning: variable 'counter' set but not used [-Wunused-but-set-variable]
  int counter = 0;
      ^~~~~~~