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  1. #include <stdio.h>
  2. int count = 0;
  3.  
  4. 	int rec(int n ){
  5. 		count++;
  6. 		if (n == 1){
  7. 			return 1;
  8. 		}
  9.  
  10. 		else if (n == 2){
  11. 			return 2 ;
  12. 	}
  13.  
  14. 		else{
  15. 			return -6*rec(n-1)-9*rec(n-2);
  16. 		}
  17. 	}
  18.  
  19. 	int main(void) {
  20. 		int n = 4;
  21. 		printf("数列a%dの値は%d\n",n,rec(n));
  22. 		printf("回数は%d回です\n", count);
  23.  
  24. 		return 0;
  25.  
  26.  
  27. }
  28.  
Success #stdin #stdout 0s 5308KB
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Standard input is empty
stdout
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数列a4の値は108
回数は5回です
https://ideone.com/CgfsyP
language:
C (gcc 8.3)
created:
17 hours ago
visibility:
public

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