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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6. 	cin >> n;
  7. 	vector<int> v,p;
  8. 	if(n%2==0)
  9. 	{
  10. 		for(int i=0;i<n;i++)
  11. 		{
  12. 			if((i+1)%2==0)
  13. 			{
  14. 				v.push_back(i+1);
  15. 			}
  16. 			else p.push_back(i+1);
  17. 		}
  18. 		for(int i=0;i<n;i++)
  19. 		{
  20. 			if((i+1)%2==1)
  21. 			{
  22. 				cout << v[i] << " ";
  23. 			}
  24. 			else
  25. 			{
  26. 				cout << p[i] << " ";
  27. 			}
  28. 		}
  29. 		cout << endl;
  30.  
  31. 	}
  32. 	else
  33. 	{
  34. 		cout << "impossible'" << endl;
  35. 	}
  36. 	return 0;
  37. }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/hJXsvm
language:
C++ (gcc 8.3)
created:
9 days ago
visibility:
public

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