static void Main(string[] args)
{
Library library = new Library("Library");
int booksCount = int.Parse(Console.ReadLine());
for (int i = 0; i < booksCount; i++)
{
library.Books.Add(Book.Parse(Console.ReadLine()));
}
var result =
library.Books.GroupBy(t => new { Author = t.Author })
.Select(g => new
{
Average = g.Sum(p => p.Price),
Author = g.Key.Author
})
.ToDictionary(x => x.Author, x => x.Average)
.OrderByDescending(x => x.Value)
.ThenBy(x => x.Key);
foreach (var pair in result)
{
Console.WriteLine($"{pair.Key} -> {pair.Value:f}");
}
}
static void Main(string[] args)
{
Library library = new Library("Library");
int booksCount = int.Parse(Console.ReadLine());
for (int i = 0; i < booksCount; i++)
{
library.Books.Add(Book.Parse(Console.ReadLine()));
}
DateTime desiredDate = DateTime.ParseExact(Console.ReadLine(), "dd.MM.yyyy", CultureInfo.InvariantCulture);
var result = library.Books.Where(b => b.ReleaseDate > desiredDate)
.OrderBy(b => b.ReleaseDate)
.ThenBy(b => b.Author);
foreach (var book in result)
{
Console.WriteLine($"{book.Title} -> {book.ReleaseDate:dd.MM.yyyy}");
}
}
