/in/foo.cc: In function 'int main()':
/in/foo.cc:9:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |         for(int i=0;i<n.size();i++)
      |                     ~^~~~~~~~~
/in/foo.cc:143:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  143 |                 for(int j=1;j<=5*n.size();j++)
      |                             ~^~~~~~~~~~~~