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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int main()
  4. {
  5. 	int n;
  6. 	cin>>n;
  7. 	n=2*n;
  8. 	int arr[n];
  9. 	int sum=(n*(n+1))/2;
  10. 	if(sum%2==0)
  11. 	 {
  12. 	 	cout<<"NO"<<endl;
  13. 	 }
  14. 	 else
  15. 	 {
  16. 	 	int first=(sum-1)/2;
  17. 	 	int sec=first+1;
  18. 	 	cout<<"first "<<first<<endl;
  19. 	    cout<<"sec "<<sec<<endl;
  20. 	 	arr[0]=1;
  21. 	 	arr[n-1]=n;
  22. 	 	arr[1]=sec-arr[0]-arr[n-1];
  23. 	 	for(int i=2;i<n-1;i++)
  24. 	 	{
  25. 	 		arr[i]=first-arr[i-1]-arr[i-2];
  26. 	 		i++;
  27. 	 		if(i==n-1)
  28. 	 		 break;
  29. 	 		arr[i]=sec-arr[i-1]-arr[i-2];
  30. 	 	}
  31. 	 	cout<<"YES"<<endl;
  32. 	 	for(int i=0;i<n;i++)
  33. 	 	  cout<<arr[i]<<" ";
  34.  
  35. 	 }
  36. }
Success #stdin #stdout 0s 4400KB
comments (?)
stdin
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5
stdout
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first 27
sec 28
YES
1 17 9 2 16 10 1 17 9 10
https://ideone.com/jDWdjp
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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