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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int *sel;
  5. int *chk;
  6. const int NUM = 4;
  7.  
  8. void dfs(int n)
  9. {
  10. 	if( n == NUM )
  11. 	{
  12. 		for( int i = 0 ; i < NUM ; ++i )
  13. 			cout << sel[i] << " ";
  14. 		cout << endl;
  15. 	}
  16. 	else
  17. 	{
  18. 		for( int i = 0 ; i < NUM ; ++i )
  19. 		{
  20. 			if( chk[i] == 0 )
  21. 			{
  22. 				chk[i] = 1;
  23. 				sel[n] = i;
  24. 				dfs(n+1);
  25. 				chk[i] = 0;
  26. 			}
  27. 		}
  28. 	}
  29. }
  30.  
  31. int main() {
  32. 	sel = new int[NUM];
  33. 	chk = new int[NUM];
  34. 	for( int i = 0 ; i < NUM ; ++i )
  35. 		sel[i] = chk[i] = 0;
  36.  
  37. 	dfs(0);
  38.  
  39. 	delete[] sel;
  40. 	delete[] chk;
  41. 	return 0;
  42. }
Success #stdin #stdout 0s 3428KB
comments (?)
stdin 
Standard input is empty
stdout 
0 1 2 3 
0 1 3 2 
0 2 1 3 
0 2 3 1 
0 3 1 2 
0 3 2 1 
1 0 2 3 
1 0 3 2 
1 2 0 3 
1 2 3 0 
1 3 0 2 
1 3 2 0 
2 0 1 3 
2 0 3 1 
2 1 0 3 
2 1 3 0 
2 3 0 1 
2 3 1 0 
3 0 1 2 
3 0 2 1 
3 1 0 2 
3 1 2 0 
3 2 0 1 
3 2 1 0
https://ideone.com/mOOQbF
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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