03. MOBA Challenger

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

namespace MOBAChallenger
{
    class Program
    {
        public static void Main()
        {
            var players = new Dictionary<string, Dictionary<string, int>>();

            string command;

            while ((command = Console.ReadLine()) != "Season end")
            {
                var current = command.Split(command.Contains(" -> ") ? " -> " : " vs ");
                string player = current[0];

                if (current.Length == 3)
                {
                    string position = current[1];
                    int skill = int.Parse(current[2]);

                    if (!players.ContainsKey(player))
                    {
                        players.Add(player, new Dictionary<string, int>());
                    }

                    if (!players[player].ContainsKey(position))
                    {
                        players[player].Add(position, skill);
                    }

                    if (players[player][position] < skill)
                    {
                        players[player][position] = skill;
                    }
                }
                else
                {
                    string secondPlayer = current[1];

                    if (players.ContainsKey(player) && players.ContainsKey(secondPlayer))
                    {
                        var sameSkills = players[player].Keys
                            .Concat(players[secondPlayer].Keys)
                            .ToList();

                        sameSkills.Distinct()
                            .ToList()
                            .ForEach(x => sameSkills.Remove(x));

                        if (sameSkills.Count > 0)
                        {
                            if (players[player][sameSkills[0]] < players[secondPlayer][sameSkills[0]])
                            {
                                players.Remove(player);
                            }
                            else if (players[player][sameSkills[0]] > players[secondPlayer][sameSkills[0]])
                            {
                                players.Remove(secondPlayer);
                            }
                        }
                    }
                }
            }

            foreach (var player in players.OrderByDescending(x => x.Value.Values.Sum()).ThenBy(x => x.Key))
            {
                Console.WriteLine($"{ player.Key}: {player.Value.Values.Sum()} skill");
                foreach  (var skill in player.Value.OrderByDescending(x => x.Value).ThenBy(x => x.Key))
                {
                    Console.WriteLine($"- {skill.Key} <::> {skill.Value}");
                }
            }
        }
    }
}