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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 = n ^^ n;
  12. 	int [n] p;
  13. 	int [int [n]] d;
  14. 	foreach (step; 0..steps)
  15. 	{
  16. 		p[] = n.iota.array;
  17. 		int v = step;
  18. 		foreach (i; 0..n)
  19. 		{
  20. 			int j = v % n;
  21. 			v /= n;
  22. 			swap (p[i], p[j]);
  23. 		}
  24. 		d[p] += 1;
  25. 	}
  26. 	writefln ("%(%s %s\n%)", d);
  27. }
  28.  
Success #stdin #stdout 0s 2708KB
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stdin
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Standard input is empty
stdout
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[0, 2, 1, 3] 10
[1, 0, 3, 2] 15
[0, 1, 3, 2] 10
[3, 0, 1, 2] 8
[3, 2, 0, 1] 10
[1, 2, 3, 0] 14
[2, 3, 0, 1] 11
[0, 1, 2, 3] 10
[2, 1, 0, 3] 9
[3, 1, 0, 2] 9
[0, 2, 3, 1] 14
[0, 3, 2, 1] 9
[3, 2, 1, 0] 10
[3, 0, 2, 1] 9
[3, 1, 2, 0] 8
[0, 3, 1, 2] 11
[2, 0, 1, 3] 11
[1, 3, 2, 0] 11
[1, 3, 0, 2] 11
[2, 3, 1, 0] 10
[1, 2, 0, 3] 14
[1, 0, 2, 3] 10
[2, 0, 3, 1] 11
[2, 1, 3, 0] 11
https://ideone.com/fxhDm2
naive shuffle, n = 4, exact stats
language:
D (dmd 2.085.0)
created:
9 years ago
visibility:
public

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