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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=0;
  4. int rec(int n){
  5.  if(n==1){
  6.  	c++;
  7.  	return 1;
  8.  }
  9.  else if(n==2){
  10.  	c++;
  11.  	return 2;
  12.  }
  13.  else{
  14.  	c++;
  15.  	return -6*rec(n-1)-9*rec(n-2);
  16.  }
  17. }
  18.  
  19. int main(void) {
  20.     int n = 5;
  21.     printf("数列a%dの値は%d\nこのときrecの呼び出し回数は%d", n, rec(n),c);
  22. 	return 0;
  23. }
  24.  
  25.  
Success #stdin #stdout 0.01s 5284KB
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Standard input is empty
stdout
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数列a5の値は-459
このときrecの呼び出し回数は0
https://ideone.com/tjZhyH
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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