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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.  
  10. if(n==2){
  11. 	return 2;
  12. }
  13.  
  14. else{ 
  15. 	return -6*rec(n-1)-9*rec(n-2);
  16.  
  17. }
  18. }
  19.  
  20. int main(void) {
  21.     int n = 5;
  22.     printf("数列a%dの値は%d\n", n, rec(n));
  23.     printf("この時のrecの呼び出し回数は%d\n",c);
  24. 	return 0;
  25. }
  26.  
  27.  
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin 
Standard input is empty
stdout 
数列a5の値は-459
この時のrecの呼び出し回数は9
https://ideone.com/oJXYkW
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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