01. Ranking

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

namespace Ranking
{
    class Program
    {
        public static void Main()
        {
            var contestsAndPasswords = new Dictionary<string, string>();
            var studentContests = new SortedDictionary<string, Dictionary<string, int>>();

            string command;

            while ((command = Console.ReadLine()) != "end of contests")
            {
                var current = command.Split(":");

                contestsAndPasswords.Add(current[0], current[1]);
            }

            while ((command = Console.ReadLine()) != "end of submissions")
            {
                var current = command.Split("=>");

                string contest = current[0];
                string password = current[1];
                string username = current[2];
                int points = int.Parse(current[3]);

                if (contestsAndPasswords.ContainsKey(contest) && contestsAndPasswords[contest] == password)
                {
                    if (!studentContests.ContainsKey(username))
                    {
                        studentContests.Add(username, new Dictionary<string, int>());
                    }

                    if (!studentContests[username].ContainsKey(contest))
                    {
                        studentContests[username].Add(contest, points);
                    }
                    else
                    {
                        if (studentContests[username][contest] < points)
                        {
                            studentContests[username][contest] = points;
                        }
                    }
                }
            }

            string bestCandidate = "";
            int totalPoints = 0;

            foreach (var user in studentContests)
            {
                int userSum = user.Value.Sum(x => x.Value);
                if(userSum > totalPoints)
                {
                    totalPoints = userSum;
                    bestCandidate = user.Key;
                }
            }

           Console.WriteLine($"Best candidate is {bestCandidate} with total {totalPoints} points.\nRanking:");

            foreach (var student in studentContests)
            {
                Console.WriteLine(student.Key);
                foreach (var contest in student.Value.OrderByDescending(x => x.Value))
                {
                    Console.WriteLine($"#  {contest.Key} -> {contest.Value}");
                }
            }
        }
    }
}