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  1. #include<iostream>
  2. using namespace std;
  3.  
  4. main()
  5. {
  6.  long long int a,b,i;
  7.  while(cin>>a)
  8.  {
  9. 	if(a==-1)
  10. 	{
  11. 	break;
  12. 	}
  13. 	else 
  14. 	{
  15. 	if((a-1)%6==0)
  16. 		{
  17. 			for(i=0;i<(a/6);i++)
  18. 			{
  19. 			if(((3*i*(i+1))+1)==a)
  20. 			{
  21. 			cout<<"Y"<<endl;
  22. 			}
  23. 			}
  24. 		}
  25. 	else
  26. 	{
  27. 	cout<<"N"<<endl;
  28. 	}
  29. 	}
  30.  
  31.  
  32.  
  33. }   
  34. }
  35.  
Success #stdin #stdout 0.01s 2728KB
comments (?)
stdin
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43
1
7
19
15
-1
stdout
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Y
N
https://ideone.com/aaaqL
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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