foo.cc: In function 'int main()':
foo.cc:23:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |  for (int i = 0; i <  b.size(); i++) {
      |                  ~~^~~~~~~~~~~
foo.cc:29:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |  for (int i = 0; i < vc.size(); i++) {
      |                  ~~^~~~~~~~~~~

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