boykopk

Untitled

Nov 29th, 2017
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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text.RegularExpressions;
  5.  
  6. public class Email_Statistics
  7. {
  8. public static void Main()
  9. {
  10. Dictionary<string, HashSet<string>> emails = new Dictionary<string, HashSet<string>>();
  11.  
  12. int emailsCount = int.Parse(Console.ReadLine());
  13.  
  14. for (int i = 0; i < emailsCount; i++)
  15. {
  16. string email = Console.ReadLine();
  17.  
  18. string emailPattern = @"^(?<username>[a-zA-Z]{5,})@(?<domain>(?<mailServer>[a-z]{3,})(?<topDomain>\.com|\.bg|\.org))$";
  19. Match match = Regex.Match(email, emailPattern);
  20.  
  21. if (match.Success)
  22. {
  23. string domain = match.Groups["domain"].Value;
  24. string username = match.Groups["username"].Value;
  25.  
  26. if (!emails.ContainsKey(domain))
  27. {
  28. emails[domain] = new HashSet<string>();
  29. }
  30.  
  31. if (!emails[domain].Contains(username))
  32. {
  33. emails[domain].Add(username);
  34. }
  35. }
  36. }
  37.  
  38. foreach (KeyValuePair<string, HashSet<string>> email in emails.OrderByDescending(x => x.Value.Count))
  39. {
  40. string domain = email.Key;
  41. HashSet<string> usernames = email.Value;
  42.  
  43. Console.WriteLine($"{domain}:");
  44.  
  45. foreach (string username in usernames)
  46. {
  47. Console.WriteLine($"### {username}");
  48. }
  49. }
  50. }
  51. }
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