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  1. #include <stdio.h>
  2. int c;
  3. int rec(int n){
  4. 	c++;
  5. 	if(n==1){
  6. 		return 1;
  7. 	}else if(n==2){
  8. 		return 2;
  9. 	}else{
  10. 		return -6*rec(n-1)-9*rec(n-2);
  11. 	}
  12. }
  13.  
  14. int main(void) {
  15. 	int a;
  16. 	scanf("%d",&a);
  17. 	printf("数列の値は%d\n",rec(a));
  18. 	printf("回数%d",c);
  19.  
  20.  
  21. 	return 0;
  22. }
  23.  
Success #stdin #stdout 0s 5268KB
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数列の値は-459
回数9
https://ideone.com/gNwPKQ
language:
C (gcc 8.3)
created:
8 days ago
visibility:
public

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