/in/foo.cc: In function 'std::ostream& operator<<(std::ostream&, const Vector&)':
/in/foo.cc:22:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |         for (int i = 0; i < x.a.size(); i++)
      |                         ~~^~~~~~~~~~~~
/in/foo.cc: In member function 'void Vector::com(Vector&, Vector&)':
/in/foo.cc:44:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |         while (i < a.size() && j < b.a.size())
      |                ~~^~~~~~~~~~
/in/foo.cc:44:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |         while (i < a.size() && j < b.a.size())
      |                                ~~^~~~~~~~~~~~
/in/foo.cc:57:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |         while (i < a.size()) {
      |                ~~^~~~~~~~~~
/in/foo.cc:61:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |         while (j < b.a.size())
      |                ~~^~~~~~~~~~~~