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  1. #include <stdio.h>
  2. int a(int n){
  3. 	int i;
  4. 	int a[100];
  5. 	a[0]=2;
  6. 	for(i=1;i<=n;i++){
  7. 		a[i]=-2*a[i-1]+4;
  8. 	}
  9. 	return a[n];
  10. }
  11. int main(void) {
  12. 	printf("%d", a(4));
  13. 	return 0;
  14. }
  15.  
Success #stdin #stdout 0s 5320KB
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12
https://ideone.com/20JD7C
language:
C (gcc 8.3)
created:
13 hours ago
visibility:
public

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