dav 44 N1

//amocana1
/*
class Book
{
protected:
    string author,name;
    int year;

public:

    Book (){}
    Book (string author,int year,string name)
    {
        this->author=author;
        this->year=year;
        this->name=name;
    }
    ~Book (){   }
    void printBook ()
    {
        cout<<"Name: "<<name<<endl;
        cout<<"Year: "<<year<<endl;
        cout<<"Author: "<<author<<endl;
    }
    int get_year ()
    {
        return year;
    }

};


class Textbook : public Book
{
    protected:
    int grade;

public:
    Textbook (string author,int year,string name,int grade) : Book (author,year,name)
    {
        this->grade=grade;
    }

    void printText ()
    {
        cout<<"Name: "<<name<<endl;
        cout<<"Year: "<<year<<endl;
        cout<<"Author: "<<author<<endl;
        cout<<"Grade: "<<grade<<endl;
    }


};

bool sort_by_year (Book a, Book b)
{
    return a.get_year() > b.get_year();
}

int main ()
{
    string name,author;
    int grade,year;

    int n;
    cin>>n;

    vector<Book>Books;

    for (int i=0;i<n;i++)
    {
        cin>>author>>year>>name>>grade;
        Book b(author,year,name);
        Textbook t (author,year,name,grade);
        Book *b_ptr=&b;
        Textbook *t_ptr=&t;
        b_ptr=t_ptr;
        t_ptr=(Textbook*)&b;
        Books.push_back(*b_ptr);
        Books.push_back(*t_ptr);
    }

sort (Books.begin(),Books.end(),sort_by_year);


for (int i = 0; i < Books.size(); ++i)
{
    Books.at(i).printBook();
}

*/