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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6. 	cin>>n;
  7. 	int a[n+1],odd=0,even;
  8. 	for(int i=1;i<=n;++i)
  9. 	{
  10. 		cin>>a[i];
  11. 		if(a[i]==1) odd++;
  12. 	}
  13. 	even=n-odd;
  14. 	if(even>0) 
  15. 	{
  16. 		cout<<2<<" ";
  17. 		even--;
  18. 	}
  19. 	if(odd>0)
  20. 	{
  21. 		cout<<1<<" ";
  22. 		odd--;
  23. 	}
  24. 	for(int i=1;i<=even;++i) cout<<2<<" ";
  25. 	for(int i=1;i<=odd;++i) cout<<1<<" ";
  26. 	return 0;
  27. }
Success #stdin #stdout 0s 15232KB
comments (?)
stdin
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9
1 1 2 1 1 1 2 1 1
stdout
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2 1 2 1 1 1 1 1 1
https://ideone.com/AIe2YT
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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