/in/foo.cc: In function 'int main()':
/in/foo.cc:18:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |  for (int i = 0; i < strings.size() - 1; ++i) {
      |                  ~~^~~~~~~~~~~~~~~~~~~~
/in/foo.cc:19:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |   for (int j = 0; j < strings.size() - i - 1; ++j) {
      |                   ~~^~~~~~~~~~~~~~~~~~~~~~~~