Files -ExamPreparation ||

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

namespace _04_files
{
    class files
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            Dictionary<string, Dictionary<string, long>> inputFiles = new Dictionary<string, Dictionary<string, long>>();

            while (n-- > 0)
            {
                string curentFile = Console.ReadLine();

                int index = curentFile.LastIndexOf('\\');
                curentFile = curentFile.Remove(index, 1).Insert(index, "valkata");

                string[] inputTokkens = curentFile
                    .Split(new string[] { "valkata" }, StringSplitOptions.RemoveEmptyEntries)
                    .ToArray();

                string directory = inputTokkens[0];

                string[] file = inputTokkens[1].Split(';').ToArray();

                string fileName = file[0];

                long fileSize = long.Parse(file[1]);

                if (!inputFiles.ContainsKey(directory))
                {
                    inputFiles.Add(directory, new Dictionary<string, long>());
                }
                if (!inputFiles[directory].ContainsKey(fileName))
                {
                    inputFiles[directory].Add(fileName, fileSize);

                }
                else
                {
                    inputFiles[directory][fileName] = fileSize;

                }
            }
            string[] input = Console.ReadLine().Split().ToArray();
            string searchedDirectory = input[2];
            string extension = input[0];

            Dictionary<string, long> searchedFiles = new Dictionary<string, long>();

            foreach (var file in inputFiles)
            {
                if (file.Key.Contains(searchedDirectory + "\\"))
                {
                    var values = file.Value;
                    foreach (var value in values)
                    {
                        if(value.Key.Contains("." + extension))
                        {
                            searchedFiles.Add(value.Key, value.Value);
                        }
                    }
                }
            }

            if(searchedFiles.Count == 0)
            {
                Console.WriteLine("No");
            }
            else
            {
                var outputFiles = searchedFiles
                    .OrderByDescending(o => o.Value)
                    .ThenBy(o => o.Key)
                    .ToDictionary(x => x.Key, y => y.Value);
                foreach (var file in outputFiles)
                {
                    Console.WriteLine($"{file.Key} - {file.Value} KB");
                }
            }
        }
    }
}