首页 > 代码库 > HDU 1201 Fibonacci Again

HDU 1201 Fibonacci Again

Fibonacci Again

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 37229    Accepted Submission(s): 17970


Problem 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
012345
 

 

Sample Output
no
no
yes
no
no
no
 
 算法分析:
      一开始用的__int64 开数组挂了,估计也会挂,n的范围可以大到1000000, 如果n的值比较大,那么f[n] 就超数据类型了。
      查到了这个公式:
                           (m+n)%3 = (m%3+n%3)%3 ;
                           取完余数后再存到数组里,f[n]就不会超数据类型了。
                 
#include <stdio.h>#include <string.h>#include <stdlib.h>int f[1000001];int main(){    int n;	int i, j;    f[0]=7%3 ;	f[1]=11%3 ;	for(i=2; i<1000000; i++)	{		f[i]=(f[i-1]%3+f[i-2]%3)%3;	}	while(scanf("%d", &n)!=EOF)	{		if(f[n]==0)			printf("yes\n");		else			printf("no\n");	}	return 0;}

  

HDU 1201 Fibonacci Again