/in/foo.cc: In function 'void solve()':
/in/foo.cc:15:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |         for(int i=0;i<s1.length();i++){
      |                     ~^~~~~~~~~~~~
/in/foo.cc:22:46: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |                                 for(int j=0;j<s2.length();j++){
      |                                             ~^~~~~~~~~~~~