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  1. #include <stdio.h>
  2. 	int count = 0;
  3. 	int rec(int n){
  4. 		count++;
  5. 	if(n == 1){
  6. 		return 1;
  7. 	}
  8. 	else
  9. 		if(n == 2){
  10. 			return 2;
  11. 	}
  12. 	else{
  13. 		return -6 * rec(n - 1) - 9 * rec(n - 2);
  14.  
  15. 	}
  16. 	}
  17. int main(void) {
  18. 	int n = 5;
  19. 	printf("数列a%dの値は%d\n", n, rec(n));
  20. 	printf("この時recの呼び出し回数は%d",count);
  21. 	return 0;
  22. }
  23.  
Success #stdin #stdout 0s 5292KB
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Standard input is empty
stdout
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数列a5の値は-459
この時recの呼び出し回数は9
https://ideone.com/K8xu2U
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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