Dictionaries_Lambda_Expressions_LINQ - 08. Logs Aggregator

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

namespace _07b_Dictionaries_Lambda_Expressions_LINQ_Exercises
{
    class Dictionaries_Lambda_Expressions_LINQ_Exercises
    {
       static void Main(string[] args)
        {
            Dictionary<string, Dictionary<string, int>> logs = new Dictionary<string, Dictionary<string, int>>();
            int n = int.Parse(Console.ReadLine());

            for (int i = 0; i < n; i++)
            {
                string line = Console.ReadLine();
                string[] tokens = line.Split(new[] { " " }, StringSplitOptions.RemoveEmptyEntries);
                string ip = tokens[0];
                string user = tokens[1];
                int duration = int.Parse(tokens[2]);

                if (!logs.ContainsKey(user))
                {
                    logs.Add(user, new Dictionary<string, int>());
                }
                if (!logs[user].ContainsKey(ip))
                {
                    logs[user].Add(ip, duration);
                }
                else
                {
                    logs[user][ip] += duration;
                }
            }
            foreach (var log in logs.OrderBy(x => x.Key))
            {
                string username = log.Key;
                int totalDuration = log.Value.Sum(x => x.Value);
                string[] ips = log.Value
                    .Keys
                    .OrderBy(x => x)
                    .ToArray();
                Console.WriteLine($"{username}: {totalDuration} [{string.Join(", ", ips)}]");
            }
        }
    }
}