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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.  
  18.  
  19. int main(void) {
  20. 	int n;
  21. 	scanf("%d",&n);
  22.  
  23. 	int result=rec(n);
  24. 	printf("数列a%dの値は%d\n",n,result);
  25. 	printf("この時recの呼び出し回数は%d\n",c);
  26. 	return 0;
  27. }
  28.  
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin 
5
stdout 
数列a5の値は-459
この時recの呼び出し回数は9
https://ideone.com/tHcxvN
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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