/in/foo.cc: In function 'int main()':
/in/foo.cc:14:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |                         for(int j=0;j+1<a[i].size();j++){
      |                                     ~~~^~~~~~~~~~~~
/in/foo.cc:20:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |                 for(int j=0;j+1<ans.size();j++){
      |                             ~~~^~~~~~~~~~~