/in/foo.cc: In function 'int main()':
/in/foo.cc:27:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     for (int i = 0; i < arr.size(); i++) {
      |                     ~~^~~~~~~~~~~~
/in/foo.cc:29:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |         if (i != arr.size() - 1) {
      |             ~~^~~~~~~~~~~~~~~~~