/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 'int Vector::search(int)':
/in/foo.cc:28:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |         for (int i = 0; i < a.size(); i++)
      |                         ~~^~~~~~~~~~
/in/foo.cc: In member function 'void Vector::c(Vector&, Vector&)':
/in/foo.cc:45:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |         for (int i = 0; i < b.a.size(); i++)
      |                         ~~^~~~~~~~~~~~