/in/foo.cc: In function 'int main()':
/in/foo.cc:14:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |         while(l<=n.size()-1)
      |               ~^~~~~~~~~~~~
/in/foo.cc:16:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |                 if (las>n.size()-l) las=1,l++;
      |                     ~~~^~~~~~~~~~~