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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. 	// your code goes here
  17. 	int n=5;
  18. 	printf ("数列a%dの値は%d\n",n,rec(n));
  19. 	printf("このときrecの呼び出し回数は%d\n",c);
  20. 	return 0;
  21. }
  22.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
Standard input is empty
stdout 
数列a5の値は-459
このときrecの呼び出し回数は9
https://ideone.com/9JNg97
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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