foo.cc: In function 'int main()':
foo.cc:26:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |                 for (int j = 0; j < bigger.size(); j++) {
      |                                 ~~^~~~~~~~~~~~~~~
foo.cc:27:43: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |                         for (int k = 0; k < smaller.size(); k++) {
      |                                         ~~^~~~~~~~~~~~~~~~

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