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  1. #include <stdio.h>
  2. //a{n} = -6a{n-1} -9a{n-2}, a{1}=1, a{2}=2(再帰あり版)
  3. int c;
  4. int rec(int n){
  5. 	c++;
  6. 	if(n==1){
  7. 		return 1;
  8. 	}
  9. 	else if(n==2){return 2;
  10.  
  11. 	}
  12. 	else{
  13. 		return -6*rec(n-1) -9*rec(n-2);
  14. }
  15. }
  16.  
  17. int main(void) {
  18.     int n = 4;
  19.     printf("数列a%dの値は%d\n", n, rec(n));
  20.     printf("%d\n",c);
  21. 	return 0;
  22. }
  23.  
  24.  
Success #stdin #stdout 0s 5284KB
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Standard input is empty
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数列a4の値は108
5
https://ideone.com/qO7KsB
language:
C (gcc 8.3)
created:
72 days ago
visibility:
public

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