#include<iostream>
#include<cstdlib>
#include<cstdio>
#include<limits>
#include<cstring>
using namespace std;
 
template <class T>
class myVector
{
    private:
        T* data;
        int len;
        int size;
    public:
        myVector()
        {
            data = NULL;
            len = size = 0;
        }
 
        myVector(int _len)
        {
            data = new T[_len];
            len = _len;
            size = 0;
        }
 
        myVector(const myVector& tmp)
        {
            if(this == &tmp)
                return;
 
            //delete []data;
            data = new T[tmp.len];
            for(int i=0; i<tmp.size; ++i)
                data[i] = tmp.data[i];
            len = tmp.len;
            size = tmp.size;
        }
 
        T& operator[](int index)
        {
            return data[index];
        }
 
        const myVector& push_back(const T tmp)
        {
            if(size >= len)
            {
                T* newData = new T[len*2 + 1];
                memcpy(newData, data, len*sizeof(T));
                delete []data;
                data = newData;
                len = 2*len + 1;
            }
            data[size++] = tmp;
            printALL();
            return *this;
        }
 
        int getSize()
        {
            return size;
        }
 
        void printALL()
        {
            cout<<len<<":"<<size<<endl;
            for(int i=0; i<size; ++i)
                cout<<data[i].f<<" ";
            cout<<endl;
            cout<<"********************"<<endl;
        }
};
 
struct A{
    int f;
    public:
     A(int r):f(r){}
     A()
     {
         f =1;
     }
};
 
int main()
{
    myVector<A> v;
    v.push_back(A(2));
    v.push_back(A(3));
    v.push_back(A(4));
    v.push_back(A(5));
    v.push_back(A(6));
 
 
    //node* head = buildTree();
 
    //cout<<i<<"q";
    //system("pause");
    return 0;
}