Колеги, дава ми 20/100 с тайм-кръш и съобщения за неверни отговори. На предварителните проверки кода ми дава верни отговори

Задачата:

6.Courses

Write a program, which keeps information about courses. Each course has a name and registered students.

You will receive course name and student name, until you receive the command "end". Check if such course already exists, and if not, add the course. Register the user into the course. When you do receive the command "end", print the courses with their names and total registered users, ordered by the count of registered users in descending order. For each contest print registered users ordered by name in ascending order.

Input

• Until you receive "end", the input come in the format: "{courseName} : {studentName}".
• The product data is always delimited by " : ".

Output

• Print information about each course, following the format:
  "{courseName}: {registeredStudents}"
• Print information about each student, following the format:
  "-- {studentName}"
   

  Examples

  Input	Output
  Programming Fundamentals : John Smith Programming Fundamentals : Linda Johnson JS Core : Will Wilson Java Advanced : Harrison White end	Programming Fundamentals: 2 -- John Smith -- Linda Johnson JS Core: 1 -- Will Wilson Java Advanced: 1 -- Harrison White
  Algorithms : Jay Moore Programming Basics : Martin Taylor Python Fundamentals : John Anderson Python Fundamentals : Andrew Robinson Algorithms : Bob Jackson Python Fundamentals : Clark Lewis end	Python Fundamentals: 3 -- Andrew Robinson -- Clark Lewis -- John Anderson Algorithms: 2 -- Bob Jackson -- Jay Moore Programming Basics: 1 -- Martin Taylor

  
  
  Моето решение:

  using System;
  using System.Collections.Generic;
  using System.Linq;
                      
  public class Program
  {
      public static void Main()
      {                
          string inputPrim = "";
          
          var listOfCours = new Dictionary<string, List<string>>();
          
          while ((inputPrim = Console.ReadLine()) != "end")
          {
            var input = inputPrim
                .Split(':')
                .Select(x => x.Trim())
                .ToArray();
              
              if (!listOfCours.ContainsKey(input[0]))
              {
               listOfCours[input[0]] = new List<string>();    
              }
              
              listOfCours[input[0]].Add(input[1]);
          } // end while
          
          listOfCours = listOfCours
              .OrderByDescending(x => x.Value.Count)
              .ThenByDescending(x => x.Key)
              .ToDictionary(x => x.Key,
                            x => x.Value);
          
          foreach (var kvp in listOfCours)
          {
           Console.WriteLine("{0}: {1}", kvp.Key, kvp.Value.Count);
              
           var orderlistMembers = kvp.Value
               .OrderBy(x => x)
               .ToList();
              
            for (int i = 0; i < kvp.Value.Count; i++)
            {
              Console.WriteLine("-- {0}", orderlistMembers[i]);  
            }              
          } // end foreach for rezult
          
          
      }
  }

  // Programming Fundamentals : John Smith
  // Programming Fundamentals : Linda Johnson
  // JS Core : Will Wilson
  // Java Advanced : Harrison White
  // end
  //Programming Fundamentals: 2
  //-- John Smith
  //-- Linda Johnson
  //JS Core: 1
  //-- Will Wilson
  //Java Advanced: 1
  //-- Harrison White

  // Algorithms : Jay Moore
  // Programming Basics : Martin Taylor
  // Python Fundamentals : John Anderson
  // Python Fundamentals : Andrew Robinson
  // Algorithms : Bob Jackson
  // Python Fundamentals : Clark Lewis
  // end
  //Python Fundamentals: 3
  //-- Andrew Robinson
  //-- Clark Lewis
  //-- John Anderson
  //Algorithms: 2
  //-- Bob Jackson
  //-- Jay Moore
  //Programming Basics: 1
  //-- Martin Taylor