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  1. #include <iostream>
  2. #include <string>
  3. using namespace std;
  4.  
  5. int n, m;
  6. string arr;
  7. bool input[9];
  8.  
  9. void solution(int position)
  10. {
  11. 	if (position == m)
  12. 	{
  13. 		for (int i = 0; i < m; i++)
  14. 			cout << arr[i] << " ";
  15. 		cout << "\n";
  16. 		return;
  17. 	}
  18.  
  19. 	for (int i = 1; i <= n; i++)
  20. 	{
  21. 		if (!input[i])
  22. 		{
  23. 			for (int j = 1; j <= i; j++)
  24. 				input[j] = true;
  25.  
  26. 			arr.push_back(i + '0');
  27.  
  28. 			solution(position + 1);
  29.  
  30. 			for (int j = 1; j <= i; j++)
  31. 				input[j] = false;
  32.  
  33. 			arr.pop_back();
  34. 		}
  35. 	}
  36. }
  37. int main(void)
  38. {
  39. 	cin >> n >> m;
  40. 	solution(0);
  41. 	return 0;
  42. }
Success #stdin #stdout 0s 4752KB
comments (?)
stdin 
4 2
stdout 
1 2 
1 3 
1 4 
2 3 
2 4 
3 4
https://ideone.com/EyylmI
language:
C++ (gcc 8.3)
created:
3 years ago
visibility:
public

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