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  1. #include <stdio.h>
  2.  
  3. int c=0;
  4. int rec(int n){
  5.     c++;
  6. 	if(n==1){
  7. 		return 1;
  8. 	}
  9. 	else if (n==2){
  10. 		return 2;
  11. 	}
  12. 	else{
  13. 		return -6*rec(n-1)-9*rec(n-2);
  14. 	}
  15. }
  16. int main(void){
  17. 	int n;
  18. 	scanf("%d",&n);
  19.  
  20. 	printf("数列a%dの値は%d\n",n,rec(n));
  21. 	printf("このときrecの呼び出し回数は%d",c);
  22. 	return 0;
  23. }
  24.  
Success #stdin #stdout 0s 5316KB
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5
stdout
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数列a5の値は-459
このときrecの呼び出し回数は9
https://ideone.com/Wn3YmE
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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