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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4.  
  5. public class Test
  6. {
  7. 	public static void Main()
  8. 	{
  9. 	    var list = new[] { 80,81,90,90,90,90,90,90,100,85,86,86,79,95,95,95,95 };
  10. 	    var dupes = FindDupes(list);
  11. 		Console.WriteLine(string.Join(", ", dupes.Select(n => n.ToString()).ToArray()));
  12. 	}
  13.  
  14. 	public static IEnumerable<int> FindDupes(IEnumerable<int> list) {
  15. 		int? back2 = null, back1 = null, prev = null;
  16. 		foreach(int current in list) {
  17. 			if(back2.HasValue) {
  18. 				if(back2.Value == back1.Value && back1.Value == current) {
  19. 					if(!prev.HasValue || prev.Value != current) {
  20. 						yield return current;
  21. 						prev = current;
  22. 					}
  23. 				}
  24. 			}
  25.  
  26. 			back2 = back1;
  27. 			back1 = current;
  28. 		}
  29. 	}
  30. }
Success #stdin #stdout 0.04s 33936KB
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Standard input is empty
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90, 95
https://ideone.com/R1ZBVk
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
public

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