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  1. #include <stdio.h>
  2.  
  3. int c;
  4.  
  5. int rec (int n){
  6. 	c++;
  7.  
  8. 	if(n==1){
  9. 		return 1;
  10. 	}
  11. 	else if (n==2){
  12. 		return 2;
  13. 	}
  14. 	else{
  15. 		return -6*rec(n-1)-9*rec(n-2);
  16. 	}
  17.  
  18. }
  19.  
  20. int main(void) {
  21. 	int n=4;
  22. 	printf("数列a%dの値は%d\n",n,rec(n));
  23. 	printf("このときrecの呼び出し回数は%d",c);
  24. 	return 0;
  25. }
  26.  
Success #stdin #stdout 0s 5320KB
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Standard input is empty
stdout
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数列a4の値は108
このときrecの呼び出し回数は5
https://ideone.com/H9yzIG
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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