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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int main(){
  6. 	int t,n;	cin >> t;
  7. 	while(t--){
  8. 		cin >> n;
  9. 		if(n == 1 || n == 3)	cout << "-1\n";
  10. 		else if(n%2 == 0){
  11. 			for(int i = 0; i<n-2; i++)	cout << "3";
  12. 			cout << "66\n";
  13. 		}else{
  14. 			for(int i = 0; i<n-5; i++)	cout << "3";
  15. 			cout << "36366\n";
  16. 		}
  17. 	}
  18. 	return 0;
  19. }
Success #stdin #stdout 0.01s 5272KB
comments (?)
stdin
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6
1
2
3
4
5
7
stdout
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-1
66
-1
3366
36366
3336366
https://ideone.com/bm1gz6
language:
C++14 (gcc 8.3)
created:
14 hours ago
visibility:
public

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