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  1. #include <stdio.h>
  2. //発展課題4
  3. int trb(int n)
  4. {
  5. 	if(n==0)
  6. 		return 0;
  7. 	else if(n==1)
  8. 		return 0;
  9. 	else if(n==2)
  10. 		return 1;	
  11. 	else		return  trb(n-1)+trb(n-2)+trb(n-3);
  12. }
  13.  
  14. int main(void)
  15. {
  16. 	int n;
  17.  
  18. 	scanf("%d",&n);
  19. 	printf("%d\n",trb(n));
  20.  
  21. 	return 0;
  22. }
Success #stdin #stdout 0.01s 5288KB
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stdin
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stdout
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4
https://ideone.com/ciRk4d
[再帰]1からnまでの積、n!階乗
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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