/in/foo.cc: In function 'int main()':
/in/foo.cc:15:15: warning: array subscript has type 'char' [-Wchar-subscripts]
   count[str[i]]++;
               ^
/in/foo.cc:18:12: warning: variable 'index_max' set but not used [-Wunused-but-set-variable]
  int max=0,index_max;
            ^~~~~~~~~
/in/foo.cc:19:16: warning: variable 'index_min' set but not used [-Wunused-but-set-variable]
  int min=10000,index_min;
                ^~~~~~~~~