MOBA-CHALLENGER

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

namespace Moba_Challenger
{
    class Program
    {
        static void Main(string[] args)
        {
            string playerInfo = string.Empty;
            Dictionary<string, Dictionary<string, int>> playersDatabase = new Dictionary<string, Dictionary<string, int>>();

            while ((playerInfo = Console.ReadLine()) != "Season end")
            {
                string[] splitPlayerInfo = playerInfo.Split(" ", StringSplitOptions.RemoveEmptyEntries).ToArray();

                if ((splitPlayerInfo.Length > 3) && (splitPlayerInfo.Contains("->")))
                {
                    string playerName = splitPlayerInfo[0];
                    string playerPosition = splitPlayerInfo[2];
                    int playerSkill = int.Parse(splitPlayerInfo[4]);

                    if (playersDatabase.ContainsKey(playerName) == false)
                    {
                        playersDatabase.Add(playerName, new Dictionary<string, int>());
                        playersDatabase[playerName].Add(playerPosition, playerSkill);
                    }
                    else if (playersDatabase[playerName].ContainsKey(playerPosition) == false)
                    {
                        playersDatabase[playerName].Add(playerPosition, playerSkill);
                    }
                    else
                    {
                        int oldSkillValue = playersDatabase[playerName][playerPosition];

                        if (playerSkill > oldSkillValue)
                        {
                            playersDatabase[playerName][playerPosition] = playerSkill;
                        }
                    }
                }
                else if((splitPlayerInfo.Length == 3) && (splitPlayerInfo.Contains("vs")))
                {
                    string firstDuelist = splitPlayerInfo[0];
                    string secondDuelist = splitPlayerInfo[2];

                    if(playersDatabase.ContainsKey(firstDuelist) && playersDatabase.ContainsKey(secondDuelist))
                    {
                        foreach (var position in playersDatabase[firstDuelist])
                        {
                            if (playersDatabase[secondDuelist].ContainsKey(position.Key))
                            {
                                int firstDuelistSkill = playersDatabase[firstDuelist][position.Key];
                                int secondDuelistSkill = playersDatabase[secondDuelist][position.Key];

                                playersDatabase.Remove(firstDuelistSkill > secondDuelistSkill ? secondDuelist : firstDuelist);
                            }
                        }
                    }
                }
            }

            foreach (var player in playersDatabase.OrderByDescending(x => x.Value.Select(y => y.Value).Sum()).ThenBy(z => z.Key))
            {
                Console.WriteLine($"{player.Key}: {player.Value.Values.Sum()} skill");

                foreach (var positionAndSkill in playersDatabase[player.Key].OrderByDescending(x => x.Value).ThenBy(y => y.Key))
                {
                    Console.WriteLine($"- {positionAndSkill.Key} <::> {positionAndSkill.Value}");
                }
            }
        }
    }
}