E - Fibonacci Again(找规律)

时间:2023-03-09 01:34:03
E - Fibonacci Again(找规律)

逐渐发现找规律的美妙之处啦,真不错,用普通方法解决很久或者很麻烦的问题,找到规律就很方便,算法最主要还是思想

Description

There are another kind of Fibonacci numbers: F(0) = 7, F(1) = 11, F(n) = F(n-1) + F(n-2) (n>=2). 

Input

Input consists of a sequence of lines, each containing an integer n. (n < 1,000,000). 

Output

Print the word "yes" if 3 divide evenly into F(n).

Print the word "no" if not.

Sample Input

0
1
2
3
4
5

Sample Output

no
no
yes
no
no
no
问题描述:
  对于以7, 11,为f(0)和f(1)的斐波那契数列,f(n) = f(n-1) + f(n-2);
  输入项数n,问第n项是否能被三整除
这样一个斐波那契数列很大很大,特别是测试项数还比较多,用大数存储也能做,但是比较麻烦,可以打表找规律
打表代码:
#include <stdio.h>
long long a[];
void init()
{
a[] = ;
a[] = ;
for(int i = ; i < ; i++)
{
a[i] = a[i-]+a[i-];
}
}
int main()
{
init();
for(int i = ; i < ; i++)
{
printf("a[%d] = %lld\n", i, a[i]);
if(a[i] % == )
printf("*****\n");
}
return ;
}

E - Fibonacci Again(找规律)

发现每四项有一个满足要求的,所以代码如下:

#include <stdio.h>

int main()
{
long long n;
while(scanf("%lld", &n)!= EOF)
{
if(n % == )
printf("yes\n");
else
printf("no\n");
}
return ;
}