/in/foo.cc: In function 'int Count(std::__cxx11::string)':
/in/foo.cc:8:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.length();i++)
              ~^~~~~~~~~~~
/in/foo.cc:6:6: warning: unused variable 'i' [-Wunused-variable]
  int i;
      ^
/in/foo.cc:11:9: warning: 'ct' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return ct; 
         ^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:19:16: warning: 'ct' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<Count(s2)<<endl;
                ^
/in/foo.cc:18:16: warning: 'ct' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<Count(s1)<<endl;
                ^