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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. 		}
  8. 		else if(n==2){
  9. 			return 2;
  10. 		}
  11. 		else{
  12. 			return -6*rec(n-1)-9*rec(n-2);
  13. 		}
  14.  
  15. }
  16. int main(void) {
  17. 	int n;
  18. 	scanf("%d", &n);
  19. 	printf("数列a%dの値は%d\n", n, rec(n));
  20. 	printf("recは%d回呼び出された", c);
  21. 	return 0;
  22. }
  23.  
Success #stdin #stdout 0s 5336KB
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stdin
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5
stdout
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数列a5の値は-459
recは9回呼び出された
https://ideone.com/2yMRmn
language:
C (gcc 8.3)
created:
19 hours ago
visibility:
public

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