foo.cc: In function ‘int main()’:
foo.cc:7:23: warning: comparison of integer expressions of different signedness: ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} and ‘int’ [-Wsign-compare]
    7 |         if(s1.find(s2)!=-1)
      |            ~~~~~~~~~~~^~~~
foo.cc:9:28: warning: comparison of integer expressions of different signedness: ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} and ‘int’ [-Wsign-compare]
    9 |         else if(s2.find(s1)!=-1)
      |                 ~~~~~~~~~~~^~~~