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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. 	else if(n==2)
  9. 	return 2;
  10. 	else
  11. 	return -6*rec(n-1)-9*rec(n-2);
  12. }
  13.  
  14. int main(void) {
  15.     int n = 4;
  16.     printf("数列a%dの値は%d\n", n, rec(n));
  17. 	printf("このときのrecの呼び出し回数は%d",c);
  18. 	return 0;
  19. }
  20.  
  21.  
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin 
Standard input is empty
stdout 
数列a4の値は108
このときのrecの呼び出し回数は5
https://ideone.com/jC8C40
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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