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  1.  
  2. #include<iostream>
  3.  
  4. using namespace std;
  5.  
  6. class Ack
  7. {
  8. public:
  9. 	int *n;
  10. 	Ack *f;
  11. 	Ack *s;
  12.  
  13. 	Ack()
  14. 	{
  15. 		n = NULL;
  16. 		f = NULL;
  17. 		s = NULL;
  18. 	}
  19.  
  20. 	Ack(int a)
  21. 	{
  22. 		n = new int;
  23. 		*n = a;
  24. 		f = NULL;
  25. 		s = NULL;
  26. 	}
  27.  
  28. 	Ack(int a,int b)
  29. 	{
  30. 		n       = NULL;
  31. 		f       = new Ack();
  32. 		f->n    = new int;
  33. 		*(f->n) = a;
  34. 		s       = new Ack();
  35. 		s->n    = new int;
  36. 		*(s->n) = b;
  37. 	}
  38.  
  39. 	void dump()
  40. 	{
  41. 		if(n)
  42. 		{
  43. 			cout<<(*n);
  44. 		}
  45. 		else
  46. 		{
  47. 			cout<<"ack(";
  48. 			f->dump();
  49. 			cout<<",";
  50. 			s->dump();
  51. 			cout<<")";
  52. 		}
  53. 	}
  54.  
  55. 	void next()
  56. 	{
  57. 		if(n)
  58. 		{
  59. 			return;
  60. 		}
  61. 		if(s->n)
  62. 		{
  63. 			if(*(f->n)==0)
  64. 			{
  65. 				n=new int;
  66. 				*n=*(s->n)+1;
  67. 				f=NULL;
  68. 				s=NULL;
  69. 			}
  70. 			else if(*(s->n)==0)
  71. 			{
  72. 				(*(f->n))--;
  73. 				(*(s->n))=1;
  74. 			}
  75. 			else
  76. 			{
  77. 				s=new Ack(*(f->n),*(s->n)-1);
  78. 				(*(f->n))--;
  79. 			}
  80. 		}
  81. 		else
  82. 		{
  83. 			s->next();
  84. 		}
  85. 	}
  86. };
  87.  
  88. int main()
  89. {
  90. 	Ack a=Ack(2,2);
  91. 	while(!a.n)
  92. 	{
  93. 		a.dump();
  94. 		cout<<endl;
  95. 		a.next();
  96. 	}
  97. 	a.dump();
  98. 	cout<<endl;
  99. }
Success #stdin #stdout 0s 3428KB
comments (?)
stdin
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Standard input is empty
stdout
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ack(2,2)
ack(1,ack(2,1))
ack(1,ack(1,ack(2,0)))
ack(1,ack(1,ack(1,1)))
ack(1,ack(1,ack(0,ack(1,0))))
ack(1,ack(1,ack(0,ack(0,1))))
ack(1,ack(1,ack(0,2)))
ack(1,ack(1,3))
ack(1,ack(0,ack(1,2)))
ack(1,ack(0,ack(0,ack(1,1))))
ack(1,ack(0,ack(0,ack(0,ack(1,0)))))
ack(1,ack(0,ack(0,ack(0,ack(0,1)))))
ack(1,ack(0,ack(0,ack(0,2))))
ack(1,ack(0,ack(0,3)))
ack(1,ack(0,4))
ack(1,5)
ack(0,ack(1,4))
ack(0,ack(0,ack(1,3)))
ack(0,ack(0,ack(0,ack(1,2))))
ack(0,ack(0,ack(0,ack(0,ack(1,1)))))
ack(0,ack(0,ack(0,ack(0,ack(0,ack(1,0))))))
ack(0,ack(0,ack(0,ack(0,ack(0,ack(0,1))))))
ack(0,ack(0,ack(0,ack(0,ack(0,2)))))
ack(0,ack(0,ack(0,ack(0,3))))
ack(0,ack(0,ack(0,4)))
ack(0,ack(0,5))
ack(0,6)
7
https://ideone.com/upRuBk
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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