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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. int main(void) {
  16. 	int n=5;
  17. 	printf("数列a%dの値は%d\n",n,rec(n));
  18. 	printf("このときrecの呼び出し回数は%d",c);
  19. 	return 0;
  20. }
  21.  
Success #stdin #stdout 0s 5280KB
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Standard input is empty
stdout
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数列a5の値は-459
このときrecの呼び出し回数は9
https://ideone.com/VwwVJm
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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