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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. 	}else if(n==2){
  8. 		return 2;
  9. 	}else{
  10. 		return -6*rec(n-1)-9*rec(n-2);
  11. 	}
  12. }
  13. int main(void) {
  14. 	// your code goes here
  15. 	int n=5;
  16. 	printf("数列a%dの値は%d\n",n,rec(n));
  17. 	printf("recの呼び出し回数は%d\n",c);
  18. 	return 0;
  19. }
  20.  
Success #stdin #stdout 0s 5316KB
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stdin
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Standard input is empty
stdout
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数列a5の値は-459
recの呼び出し回数は9
https://ideone.com/xZjFlQ
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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