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  1. #include <iostream>
  2. using namespace std;
  3. void solve(){
  4. 	long long n;cin>>n;
  5. 	if(n == 2) {cout<<-1<<endl; return;}
  6. 	int ct = 1;
  7. 	for(long long i = 1 ; i <= n*n ; i+=2){
  8. 		cout<<i<<" ";
  9. 		if(ct == n) {cout<<endl; ct = 1;}
  10. 		else ct++;
  11. 	}
  12. 	for(long long i = 2 ; i <= n*n ; i+=2){
  13. 		cout<<i<<" ";
  14. 		if(ct == n) cout<<endl;
  15. 		ct++;
  16. 	}
  17. }
  18.  
  19. int main() {
  20. 	int t;cin>>t;
  21. 	while(t--){
  22. 		solve();
  23. 	}
  24. 	return 0;
  25. }
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin
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3
1
2
3
stdout
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1 
-1
1 3 5 
7 9 2 
4 6 8
https://ideone.com/LWE0bS
language:
C++14 (gcc 8.3)
created:
30 days ago
visibility:
public

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