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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6. 	cin >> n;
  7. 	if(n%2==0)
  8. 	{
  9. 		int even=2;
  10. 		int odd = 1;
  11. 		for(int i=1;i<=n;i++)
  12. 		{
  13. 			if(i%2!=0)
  14. 			{
  15. 				cout << even << " " ;
  16. 				even += 2;
  17. 			}
  18. 			else
  19. 			{
  20. 				cout << odd << " ";
  21. 				odd += 2;
  22. 			}
  23. 		}
  24. 		cout << endl;
  25.  
  26. 	}
  27. 	else
  28. 	{
  29. 		cout << "impossible'" << endl;
  30. 	}
  31. 	return 0;
  32. }
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin 
4
stdout 
2 1 4 3
https://ideone.com/x3GTq2
language:
C++ (gcc 8.3)
created:
9 days ago
visibility:
public

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