Ranking_Sets_and_Dictionaries

using System;
using System.Collections.Generic;
using System.ComponentModel.Design;
using System.Linq;

namespace Ranking_Sets_and_Dictionaries
{
    class Program
    {
        static void Main(string[] args)
        {
            Dictionary<string, string> contestInfo = new Dictionary<string, string>();
            string input = Console.ReadLine();

            while (input != "end of contests")
            {
                string[] data = input.Split(":");
                string contest = data[0];
                string passContest = data[1];

                contestInfo.Add(contest, passContest);
                input = Console.ReadLine();
            }

            Dictionary<string, Dictionary<string, int>> usersInfo = new Dictionary<string, Dictionary<string, int>>();

            string info = Console.ReadLine();

            while (info != "end of submissions")
            {
                string[] data = info.Split("=>");
                string contest = data[0];
                string password = data[1];
                string username = data[2];
                int points = int.Parse(data[3]);

                if (contestInfo.ContainsKey(contest))
                {
                    if (contestInfo[contest] == password)
                    {

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

                        if (!usersInfo[username].ContainsKey(contest))
                        {
                            usersInfo[username].Add(contest, points);
                        }
                        else
                        {
                            if (usersInfo[username][contest] < points)
                            {
                                usersInfo[username][contest] = points;
                            }
                        }
                    }
                }
                info = Console.ReadLine();
            }

            KeyValuePair<string, int> bestCandidate = BestCandidate(usersInfo);
            Console.WriteLine($"Best candidate is {bestCandidate.Key} with total {bestCandidate.Value} points.");
            Console.WriteLine("Ranking:");

            foreach (var student in usersInfo.OrderBy(s=>s.Key))
            {
                Console.WriteLine(student.Key);

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

        }
        private static KeyValuePair<string, int> BestCandidate(Dictionary<string, Dictionary<string, int>> usersInfo)
        {
            int bestPoints = 0;
            string bestCand = string.Empty;

            foreach (var (key, value) in usersInfo)
            {
                string username = key;
                int sumPoints = value.Values.Sum();

                if (bestPoints < sumPoints)
                {
                    bestPoints = sumPoints;
                    bestCand = username;
                }
            }
            KeyValuePair<string, int> bestCandidate = new KeyValuePair<string, int>(bestCand, bestPoints);
            return bestCandidate;
        }
    }
}