text: #include <vector>
  
  using namespace std;
  
  template <class T>
  class VectorStack{
      public:
          VectorStack() {};
          ~VectorStack(){};
          unsigned int size();
          void push(T);
          void insert(T);
          bool remove(T);
          T at(unsigned int);
          T pop();
      private:
          vector<T> elements;
          
  };