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  1. #include <stdio.h>
  2. static int count=0;
  3. int funk(){
  4.  
  5. 	count++;
  6. 		return count;
  7. }
  8. int rec(int n){
  9.  
  10. 	if(n==1){
  11. 		funk();
  12. 		return 1; 
  13. 	}
  14. 	else if(n==2){
  15. 		funk();
  16. 		return 2; 
  17. 	}
  18. 	else{
  19. 		funk();
  20. 		return -6*rec(n-1)-9*rec(n-2); 
  21. 	}
  22. }
  23.  
  24. int main(){
  25.  
  26. 	int n=5;
  27. 	printf("数列a%dの値は%d",n,rec(n));
  28. 	printf("呼び出しの回数は%d",count);
  29.  
  30. 	return 0;
  31. }
  32.  
Success #stdin #stdout 0s 5300KB
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数列a5の値は-459呼び出しの回数は9
https://ideone.com/Rh256p
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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