foo.cc: In function ‘int main()’:
foo.cc:13:27: 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 < s2.size(); i++)
      |                         ~~^~~~~~~~~~~
foo.cc:16:43: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   16 |         for (int i = s1.size() - count; i < s1.size(); i++)
      |                                         ~~^~~~~~~~~~~