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  1. #include <stdio.h>
  2. //a{n} = 2a{n-1} + a{n-2}, a{1}=2, a{2}=3(再帰なし版)
  3. int c;
  4. int main(void) {
  5. 	c++;
  6.     int n = 5;
  7.     int a, b = 3, c = 2; 
  8.     for(int i = 3; i <= n; i++){
  9.         a = 2*b + c;
  10.         c=b;
  11.         b=a;
  12.     }
  13.     printf("数列a%dの値は%d\n", n, a);
  14.     printf("このときrecの呼び出し回数は%d",c);
  15. 	return 0;
  16. }
  17.  
  18.  
Success #stdin #stdout 0s 5284KB
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Standard input is empty
stdout
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数列a5の値は46
このときrecの呼び出し回数は19
https://ideone.com/jF4ja8
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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