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  1. // written in the D programming language
  2. import std.algorithm;
  3. import std.array;
  4. import std.random;
  5. import std.range;
  6. import std.stdio;
  7.  
  8. void main ()
  9. {
  10. 	immutable int n = 4;
  11. 	immutable int steps = 10_100 * n ^^ n;
  12. 	int [n] p;
  13. 	int [int [n]] d;
  14. 	foreach (step; 0..steps)
  15. 	{
  16. 		p[] = n.iota.array;
  17. 		foreach (i; 0..n)
  18. 		{
  19. 			int j = uniform (0, n);
  20. 			swap (p[i], p[j]);
  21. 		}
  22. 		d[p] += 1;
  23. 	}
  24. 	writefln ("%(%s %s\n%)", d);
  25. }
  26.  
Success #stdin #stdout 1.31s 2732KB
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stdin
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Standard input is empty
stdout
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[0, 2, 1, 3] 101017
[0, 1, 3, 2] 101144
[1, 0, 3, 2] 151325
[3, 0, 1, 2] 81097
[3, 2, 0, 1] 101275
[2, 3, 0, 1] 110811
[1, 2, 3, 0] 141461
[0, 1, 2, 3] 101129
[2, 1, 0, 3] 90904
[3, 1, 0, 2] 91372
[0, 2, 3, 1] 141320
[3, 2, 1, 0] 100997
[0, 3, 2, 1] 91327
[3, 0, 2, 1] 90743
[3, 1, 2, 0] 80384
[0, 3, 1, 2] 111424
[2, 0, 1, 3] 111194
[1, 3, 2, 0] 110692
[1, 3, 0, 2] 110917
[2, 3, 1, 0] 100812
[1, 2, 0, 3] 141214
[2, 1, 3, 0] 111493
[2, 0, 3, 1] 111077
[1, 0, 2, 3] 100471
https://ideone.com/8Bfm6v
naive shuffle, n = 4, random stats
language:
D (dmd 2.085.0)
created:
9 years ago
visibility:
public

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