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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. typedef long long int ll;
  5. int main(){
  6. 	ll t;
  7. 	cin>>t;
  8. 	while(t--){
  9. 		ll n;
  10. 		cin>>n;
  11. 		if(n%2!=0){
  12. 		ll b[n+1] = {0};
  13. 		for(ll i=1;i<=n;i++){
  14. 			b[i] = i-1;
  15. 		}
  16. 		b[1] = n;
  17.  
  18. 		//RRRRR
  19. 		for(ll i=1;i<=n;i++){
  20. 			cout<<b[i]<<" ";
  21. 		}
  22. 		}else{
  23. 			cout<<"-1";
  24. 		}
  25. 		cout<<"\n";
  26. 	}
  27.  
  28. 	return 0;
  29. }
Success #stdin #stdout 0s 5284KB
comments ()
stdin
copy 
4
2
3
4
5
stdout
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-1
3 1 2 
-1
5 1 2 3 4
https://ideone.com/dVAMAT
language:
C++ (gcc 8.3)
created:
9 days ago
visibility:
public

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