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  1. #include <stdio.h>
  2.  
  3. int c;
  4.  
  5. int rec(int n){
  6. 	c++;
  7. 	if(n==1){
  8. 		return 1;
  9. 	}
  10. 	else if(n==2){
  11. 		return 2;
  12. 	}
  13. 	else{
  14. 		return -6*rec(n-1)-9*rec(n-2);
  15. 	}
  16. }
  17. int main(void){
  18. 	int n=5;
  19. 	printf("数列a%dの値は%d\n",n,rec(n));
  20. 	printf("このときrecの呼び出し回数は%d",c);
  21. 	return 0;
  22. }
Success #stdin #stdout 0.01s 5260KB
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Standard input is empty
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/QK81IS
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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