BookLibrary

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Globalization;

namespace ObjectsAndClasses
{
    public class StartUp
    {
        public static void Main()
        {
            SortedDictionary<string, decimal> results = new SortedDictionary<string, decimal>();
            Library library = new Library();
            Book newBook = new Book();
            int n = int.Parse(Console.ReadLine());
            for (int i = 0; i < n; i++)
            {
                newBook = ReadInput();
                library.Book.Add(newBook);
                if (!results.ContainsKey(newBook.Author))
                {
                    results.Add(newBook.Author, newBook.Price);
                }
                else
                {
                    results[newBook.Author] += newBook.Price;
                }
            }
            foreach (var result in results.OrderByDescending(x => x.Value))
            {
                Console.WriteLine($"{result.Key} -> {result.Value:F2}");
            }
        }

        private static Book ReadInput()
        {
            Book b = new Book();
            var input = Console.ReadLine()
                    .Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)
                    .ToArray();
            b.Title = input[0];
            b.Author = input[1];
            b.Publisher = input[2];
            b.ReleaseDate = DateTime.ParseExact(input[3], "dd.MM.yyyy", CultureInfo.InvariantCulture);
            b.ISBN = input[4];
            b.Price = decimal.Parse(input[5]);
            return b;
        }

    }
    class Library
    {
        public string Name { get; set; }
        public List<Book> Book { get; set; }
        public Library()
        {
            Book = new List<Book>();
        }
    }
    class Book
    {
        public string Title { get; set; }
        public string Author { get; set; }
        public string Publisher { get; set; }
        public DateTime ReleaseDate { get; set; }
        public string ISBN { get; set; }
        public decimal Price { get; set; }
    }
}