Softuni - Files

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

namespace Files
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());

            var fileSize = new Dictionary<string, long>();
            var helpList = new List<string>();
            for (int i = 0; i < n; i++)
            {
                string input = Console.ReadLine();
                var inputHelp = input.Split('\\').ToList();
                string root = input.Split('\\').ToArray()[0];
                string fileextSize = input.Split('\\').ToArray().Last();
                string file = fileextSize.Split(';').ToArray()[0];
                long size = long.Parse(fileextSize.Split(';').ToArray()[1]);

                string rootFoldersFileSize = $@"{root}\{file}\{size}";
                helpList.Add(rootFoldersFileSize);
            }

            var command = Console.ReadLine().Split(' ').ToArray();

            string extCommand = command[0];
            string rootCommand = command[2];
            int count = 0;
            foreach (string item in helpList)
            {
                var rootFileSize = item.Split('\\').ToArray();
                string root = rootFileSize[0];

                string file = rootFileSize[1];


                if (root == rootCommand && file.Substring(Math.Max(0, file.ToString().Length - extCommand.Length)) == extCommand)
                {
                    fileSize[file.ToString()] = long.Parse(rootFileSize[2].ToString());
                    count++;
                }
            }
            if (count == 0)
            {
                Console.WriteLine("No");
                return;
            }
            foreach (var pair in fileSize.OrderBy(x=>x.Key).OrderByDescending(x => x.Value))
            {
                Console.WriteLine($"{pair.Key} - {pair.Value} KB");
            }
        }
    }
}