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  1. #include <stdio.h>
  2. int c;
  3. //a{n} = -6a{n-1} -9a{n-2}, a{1}=1, a{2}=2(再帰あり版)
  4. int rec(int n)
  5.  
  6. {
  7. c++;
  8. if(n==1){
  9. 	return 1;
  10. }	
  11.  
  12. 	else if(n==2){
  13. 		return 2;
  14. 	}
  15. 	else {
  16. 	return -6*rec(n-1)-9*rec(n-2);	
  17.  
  18. 	}
  19.  
  20. }
  21.  
  22. int main(void) {
  23.     int n = 5;
  24.     printf("数列a%dの値は%d\n", n, rec(n));
  25.     printf("recの呼び出した回数は%d",c);
  26. 	return 0;
  27. }
  28.  
  29.  
Success #stdin #stdout 0s 5320KB
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Standard input is empty
stdout
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数列a5の値は-459
recの呼び出した回数は9
https://ideone.com/rmsrZF
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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