foo.cc: In function 'void Solve()':
foo.cc:13:21: warning: array subscript has type 'char' [-Wchar-subscripts]
   13 |                 buc[c]++;
      |                     ^
foo.cc:16:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |         for(int i=0; i<str.size(); i++)
      |                      ~^~~~~~~~~~~
foo.cc:17:30: warning: array subscript has type 'char' [-Wchar-subscripts]
   17 |                 if(buc[str[i]] == 1)
      |                              ^

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