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  1. #include <stdio.h>
  2.  
  3. int rec(int n){
  4.  
  5. 	int a,b,c;
  6. 	b=1;
  7. 	c=2;
  8. 	for(int i=3;i<=n;i++){
  9. 		a=-2*c+2*b;
  10. 		b=c;
  11. 		c=a;
  12. 	}
  13. 	return a;
  14. }
  15.  
  16. int main(void){
  17.  
  18. 	int n=3;
  19. 	printf("%d",rec(n));
  20. 	return 0;
  21. }
Success #stdin #stdout 0.01s 5324KB
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https://ideone.com/1EZoN9
language:
C (gcc 8.3)
created:
9 days ago
visibility:
public

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