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  1. using System;
  2. using System.Linq;
  3. using System.Collections.Generic;
  4.  
  5. public static class Test
  6. {
  7.     public static IEnumerable<T> Last<T>(this IEnumerable<T> source, int n)
  8.     {
  9.         using(var it = source.GetEnumerator())
  10.         {
  11.     	    var buffer = new Queue<T>();
  12.  
  13.             while (buffer.Count < n && it.MoveNext())
  14.         	    buffer.Enqueue(it.Current);
  15.  
  16.             while (it.MoveNext())
  17.             {
  18.             	buffer.Dequeue();
  19.         	    buffer.Enqueue(it.Current);
  20.             }
  21.             return buffer;
  22.         }
  23.     }
  24.  
  25. 	public static void Main()
  26. 	{
  27. 		var seq = new[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
  28. 		foreach (var n in seq.Last(5))
  29. 		    Console.Write(string.Format("{0} ", n));
  30. 	}
  31. }
Success #stdin #stdout 0.04s 34864KB
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5 6 7 8 9
https://ideone.com/YFmcRL
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
public

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