hdoj1021Fibonacci Again
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第二个方法是找出的规律。你们可以观察观察。
/*Fibonacci Again
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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
0
1
2
3
4
5
Sample Output
no
no
yes
no
no
no*/
<span style="font-size:18px;"># include<stdio.h># define m 1000001int f[m];int main(){ int n,i; f[0]=7; f[1]=11; for(i=2;i<=m;i++) f[i]=(f[i-1]%3+f[i-2]%3)%3; while(scanf("%d",&n)!=EOF) { if(f[n]%3==0) printf("yes\n"); else printf("no\n"); } return 0;}</span>
<span style="font-size:18px;">#include<stdio.h> main() { int n; while(~scanf("%d",&n)) { if(n%4==2) printf("yes\n"); else printf("no\n"); } }</span>
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