#include<iostream>
#include<vector>
using namespace std;
class Consumable
{
protected:
    bool opened;
public:
    virtual void readLabel()=0;
    virtual void consume()=0;
    virtual double quantity()=0;
};
class Eatable : public Consumable
{
protected:
    double massPerPiece;
    int pieces;
public:
    Eatable(double _massPerPiece=-1,int _pieces=-1)
    {
        this->opened=0;
        this->massPerPiece=_massPerPiece;
        this->pieces=_pieces;
    }

    void readLabel()
    {
        cout<<"Opened: "<<this->opened<<endl;
        cout<<"Mass: "<<this->massPerPiece<<endl;
        cout<<"Pieces: "<<this->pieces<<endl;
    }
    void consume()
    {
        this->opened=1;
        this->pieces--;
    }
    double quantity()
    {
        return this->pieces;
    }
};
class Drinkable : public Consumable
{
protected:
    double volume;
public:
    Drinkable(double _volume=-1)
    {
        opened=0;
        this->volume=_volume;
    }

    void readLabel()
    {
        cout<<"Opened: "<<opened<<endl;
        cout<<"Volume: "<<this->volume<<endl;
    }
    void consume()
    {
        opened=1;
        this->volume-=5;
        if(this->volume<0) this->volume = 0;
    }
    double quantity()
    {
       return this->volume;
    }
};

class Chocolate : public Eatable
{
    double cocoa;
    int rows,cols;
public:
    Chocolate(double _cocoa,int _rows,int _cols,double _massPerPiece,int _pieces)
    {
        this->cocoa=_cocoa;
        this->rows=_rows;
        this->cols=_cols;
        this->massPerPiece=_massPerPiece;
        this->pieces=_pieces;
    }
    void readLabel()
    {
        cout<<"Cocoa: "<<this->cocoa<<endl;
        cout<<"Rows: "<<this->rows<<endl;
        cout<<"Cols: "<<this->cols<<endl;
        cout<<"Mass per piece: "<<this->massPerPiece<<endl;
        cout<<"Pieces: "<<this->pieces<<endl;
    }
    void consume()
    {
        this->opened=1;
        this->pieces--;
        if(this->pieces<0) this->pieces=0;
    }
    double quantity()
    {
        return this->pieces;
    }
};
class Beer : public Drinkable
{
    int alcohol;
    string brand;
public:
    Beer(int _alcohol,string _brand,double _volume)
    {
        this->alcohol=_alcohol;
        this->brand=_brand;
        this->volume=_volume;
    }
    void readLabel()
    {
        cout<<"Alcohol: "<<this->alcohol<<endl;
        cout<<"Brand: "<<this->brand<<endl;
        cout<<"Volume: "<<this->volume<<endl;
        cout<<"Opened: "<<this->opened<<endl;
    }
    void consume()
    {
        this->opened=1;
        this->volume-=5;
        if(this->volume<0) this->volume=0;
    }
    double quantity()
    {
        return this->volume;
    }
};

template<class T>
class VendingMacine
{
    vector<vector<T*>> v;
public:
    static int sn;
    VendingMacine(size_t sz)
    {
        v = vector<vector<T*>>(sz);
        sn++;
    }

    T operator [] (size_t idx)
    {
        if(idx<v.size())
        {
            T ans = v[idx].back();
            v[idx].pop_back();
            return ans;
        }
    }
    void put(size_t idx,T* Tptr)
    {
        if(idx<v.size())
        {
            v[idx].push_back(Tptr);
        }
    }
    bool empty(size_t idx)
    {
        return v[idx].empty();
    }

};

template<class T>
int VendingMacine<T>::sn=0;
int main()
{

    return 0;
}