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  1. #include<stdio.h>
  2. int func(int n){
  3. 	int a;
  4. 	int b=1;
  5. 	int c=2;
  6. 	for(int i=3;i<=n;i++){
  7. 		a=-2*c+2*b;
  8. 		b=c;
  9. 		c=a;
  10. 	}
  11. 	return a;
  12. }
  13.  
  14. int main (void){
  15. 	int n=3;
  16. 	printf("%d",func(n));
  17. 	return 0;
  18. }
Success #stdin #stdout 0s 5312KB
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https://ideone.com/Q4v4Fx
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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