01.Ranking

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

namespace _01.Ranking
{
    class Program
    {
        private class Student
        {
            public string Name { get; }

            public Dictionary<string, int> ContestWithPoints { get; }

            public Student(string name)
            {
                Name = name;
                ContestWithPoints = new Dictionary<string, int>();
            }
        }
        static void Main(string[] args)
        {
            Dictionary<string, string> contests = new Dictionary<string, string>();
            Dictionary<string, Student> userPoints = new Dictionary<string, Student>();

            string line;
            while ((line = Console.ReadLine()) != "end of contests")
            {
                string[] parts = line.Split(":", StringSplitOptions.RemoveEmptyEntries);

                string contest = parts[0];
                string password = parts[1];

                if (!contests.ContainsKey(contest))
                {
                    contests.Add(contest, password);
                }
            }

            while ((line = Console.ReadLine()) != "end of submissions")
            {
                string[] parts = line.Split("=>", StringSplitOptions.RemoveEmptyEntries);
                string contest = parts[0];
                string password = parts[1];
                string username = parts[2];
                int points = int.Parse(parts[3]);

                if (!contests.ContainsKey(contest) || contests[contest] != password)
                {
                    continue;
                }

                if (!userPoints.ContainsKey(username))
                {
                    userPoints.Add(username, new Student(username));
                }

                Student student = userPoints[username];

                if (!student.ContestWithPoints.ContainsKey(contest))
                {
                    student.ContestWithPoints.Add(contest, points);
                }

                if (student.ContestWithPoints[contest] < points)
                {
                    student.ContestWithPoints[contest] = points;
                }
            }

            PrintTheRanking(userPoints.Values.ToList());
        }
        private static void PrintTheRanking(List<Student> listWithStudents)
        {
            var bestCandidate = listWithStudents
                .OrderByDescending(x => x.ContestWithPoints.Values.Sum())
                .First();

            Console.WriteLine($"Best candidate is {bestCandidate.Name} with total {bestCandidate.ContestWithPoints.Values.Sum()} points.");

            Console.WriteLine("Ranking:");

            foreach (var student in listWithStudents.OrderBy(x => x.Name))
            {
                Console.WriteLine(student.Name);

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