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  1. #include <stdio.h>
  2. int c=0;
  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.  
  17.  
  18. int main(void) {
  19. 	int n = 5;
  20. 	printf("数列a%dの値は%d\n",n,rec(n));
  21. 	printf("この時のrecの呼び出し回数は%d",c);
  22. 	return 0;
  23. }
  24.  
Success #stdin #stdout 0s 5328KB
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Standard input is empty
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数列a5の値は-459
この時のrecの呼び出し回数は9
https://ideone.com/4C0oCm
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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