/in/foo.cc: In function 'int main()':
/in/foo.cc:12:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |      if (i  == str.length())cout << "Yes" << endl;
      |          ~~~^~~~~~~~~~~~~~~