using System;
using System.Collections.Generic;
using System.Linq;

namespace labDAP
{
    class Program
    {
        static void Main(string[] args)
        {
            //string[] words1 = { "a", "b", "c" };
            //string[] words2 = { "d", "e", "f" };
            //var intersect = words1.Intersect(words2);
            //List<Book> books = new List<Book>();
            //List<Author> authors = new List<Author>();
            //books.Add(new Book(0, "b1", 0));
            //books.Add(new Book(1, "b2", 0));
            //books.Add(new Book(2, "b3", 1));
            //books.Add(new Book(3, "b4", 1));
            //books.Add(new Book(4, "b5", 1));
            //authors.Add(new Author(0, "a1"));
            //authors.Add(new Author(1, "a2"));
            //var group = books.GroupBy(x => x.authorId);
            //foreach (var x in group)
            //{
            //    Console.WriteLine(x.Key);
            //}

            //var groupedResult = books.GroupBy(s => s.authorId).ToList();

            //foreach (var a in groupedResult)
            //{
            //    Console.WriteLine( a.Count());

            //}
            //var join = books.Join(authors, book => book.authorId, author => author.id, (book, author) => new
            //{
            //    ID = book.id,
            //    BName = book.title,
            //    AID = book.authorId,
            //    AN = author.name
            //}
            //    ).OrderBy(x => Guid.NewGuid()

            //    ) ;
            //foreach (var b in join)
            //{
            //    Console.WriteLine(b.ToString());
            //}



        }
    }
}