/in/foo.cc: In function 'int main()':
/in/foo.cc:8:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |         for (int i=0; i<s.size(); i++){
      |                       ~^~~~~~~~~
/in/foo.cc:13:24: 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 i=0; i<t.size(); i++){
      |                       ~^~~~~~~~~
/in/foo.cc:19:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   19 |         if (t.find (s)==-1){
      |             ~~~~~~~~~~^~~~