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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. 	}
  15. 	else{
  16. 		return -6*rec(n-1) -9*rec(n-2);
  17. 	}
  18. }
  19.  
  20. int main(void){
  21. 	int n = 5;
  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\n" ,c);
  24. 	return 0;
  25. }
Success #stdin #stdout 0s 5320KB
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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/L26pEd
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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