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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 rec(int n){
  4.     if(n==1){
  5.      return 1;
  6.    }
  7.     else if(n==2){
  8.      return 2;
  9.    }
  10.     else{
  11.      return -6*rec(n-1)-9*rec(n-2);
  12.    }
  13. }
  14.  
  15. int main(void) {
  16.     int n;
  17.     scanf("%d",&n);
  18.     printf("数列a%dの値は%d\n", n, rec(n));
  19. 	return 0;
  20. }
  21.  
  22.  
Success #stdin #stdout 0s 5320KB
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10
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数列a10の値は275562
https://ideone.com/7bSwb9
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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