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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 T[n];
  12.     	    var i = 0;
  13.  
  14.             while (it.MoveNext())
  15.         	    buffer[(i++) % n] = it.Current;
  16.  
  17.             var len = Math.Min(n, i);
  18.             for (int j = i - len; j < i; j++)
  19.            		yield return buffer[ (j + n) % n]; 
  20.  
  21.         }
  22.     }
  23.  
  24. 	public static void Main()
  25. 	{
  26. 		var seq = new[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
  27. 		foreach (var n in seq.Last(5))
  28. 		    Console.Write(string.Format("{0} ", n));
  29. 	}
  30. }
Success #stdin #stdout 0.03s 33848KB
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Standard input is empty
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5 6 7 8 9
https://ideone.com/N1NMCJ
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
public

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