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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. const double PI=acos(-1.0);
  5. #define ll long long
  6. int main()
  7. {
  8.  
  9. 	int i,j,k;
  10. 	int n,m;
  11.  
  12. 	cin>>m;
  13. 	int a[m];
  14. 	for ( i = 0; i < m; ++i)
  15. 	{
  16. 		cin>>a[i];
  17. 	}
  18. 	int x,check=0;
  19. 	for ( i = 0; i < m; ++i)
  20. 	{
  21. 		for ( j = i; j < m; ++j)
  22. 		{
  23. 			x=__gcd(a[i],a[j]);
  24. 			if(!binary_search(a,a+m,x))
  25. 			{
  26. 				//cout<<x<<endl;
  27. 				check=1;
  28.  
  29. 			}	
  30. 			//else check=1;
  31. 		}
  32. 	}
  33. 	if(check)cout<<"-1\n";
  34. 	else
  35. 	{
  36. 		cout<<m<<endl;
  37. 		for ( i = 0; i < m; ++i)
  38. 		{
  39. 		cout<<a[i]<<" ";
  40. 		}
  41. 		cout<<endl;
  42. 	}
  43.  
  44.  
  45. 	return 0;
  46. }
Success #stdin #stdout 0s 4508KB
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https://ideone.com/8Imp6h
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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