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  1. #include <iostream>
  2. #include <vector>
  3. #include <algorithm>
  4. #include <numeric>
  5. using namespace std;
  6.  
  7. int main() 
  8. {
  9. 	int n = 5;
  10. 	vector<int> v(n);
  11. 	iota(v.begin(), v.end(), 1);
  12.  
  13. 	int k = 2;
  14. 	vector<int> mask(v.size());
  15. 	fill_n(mask.begin(), k, 1);
  16.  
  17. 	do 
  18. 	{
  19. 		for (int i = 0; i < mask.size(); ++i)
  20. 		{
  21. 			if (mask[i]) { cout << v[i] << " "; }
  22. 		}
  23. 		cout << "\n";
  24. 	} 
  25. 	while(prev_permutation(mask.begin(), mask.end()));
  26. }
Success #stdin #stdout 0s 4372KB
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stdin
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Standard input is empty
stdout
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1 2 
1 3 
1 4 
1 5 
2 3 
2 4 
2 5 
3 4 
3 5 
4 5
https://ideone.com/anVmk6
mask permutations
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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