#include <iostream>
#include <string>
#include <sstream>
using namespace std;

template <class T>
class myVector{
private:
    T numItems, maxSize;
    T* items;
    void resize(T newCap)
    {
        //step 1: create a new bigger array
        T* tmp = new int[newCap];

//        step 2: copy contents of old array to the new bigger array
        for (int i = 0; i < maxSize; i++)
        {
            tmp[i] = items[i];
        }

        //step 3: delete old array
        delete[] items;

        //step 4: poT'items' array variable to the new array
        items = tmp;

//        step 5: update capacity
        maxSize = newCap;

    }

public:
    myVector()
    {
        maxSize = 20;
        items = new int[maxSize];
        numItems = 0;
    }
    myVector(T capacity)
    {
        maxSize = capacity;
        items = new int[maxSize];
        numItems = 0;
    }

    T size()
    {
        return numItems;
    }

    T capacity()
    {
        return maxSize;
    }

    void push_back(T x)
    {
        if (numItems == maxSize)
        {
            resize(maxSize*2);
        }
        items[numItems] = x;
        numItems++;
    }

    void back()
    {
        numItems--;
        return items[numItems];
    }


};