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  1. #include<stdio.h>
  2. int main()
  3. {
  4. 	int T,N,i,num,a,b;
  5. 	scanf("%d",&T);
  6. 	while(T--)
  7. 	{
  8. 		a=2;
  9. 		b=3;
  10. 		scanf("%d",&N);
  11. 		for(i=3;i<=N;i++)
  12. 		{
  13. 			num=b+2*a;
  14. 			a=b;
  15. 			b=num;
  16. 		}
  17. 		if(N==1)	num=a;
  18. 		else if(N==2)	num=b;
  19. 		printf("%d\n",num);
  20. 	}
  21. 	return 0;
  22. }
Success #stdin #stdout 0s 2056KB
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stdout
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https://ideone.com/oYEASK
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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