/in/foo.cc: In function 'int main()':
/in/foo.cc:13:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |                 for(int j=0;j<st[i].size();j++)
      |                             ~^~~~~~~~~~~~~
/in/foo.cc:17:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |                         for(int k=0;k<st[i].size();k++)
      |                                     ~^~~~~~~~~~~~~