foo.cc: In function 'int main()':
foo.cc:13:31: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   13 |                 if(s1.find(s2)!=-1)
      |                    ~~~~~~~~~~~^~~~
foo.cc:21:31: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   21 |                 if(s2.find(s1)!=-1)
      |                    ~~~~~~~~~~~^~~~

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