uva 10183(大数)

题意:找a和b之间的斐波那契数有几个。

思路:尝试了一下java的大数。直接暴力即可。

代码如下:

 1 import java.math.BigInteger;
 2 import java.util.Scanner;
 3 
 4 class Main{
 5     public static int len;
 6 
 7     public static void main(String arg[]){
 8         Scanner in = new Scanner(System.in);
 9         BigInteger[] f = init();
10         BigInteger a, b;
11         while(true){
12             a = in.nextBigInteger(); b = in.nextBigInteger();
13             if(a.compareTo(BigInteger.ZERO) == 0 && b.compareTo(BigInteger.ZERO) == 0) break;
14             int ans = 0;
15             for(int i=0; i<=len; i++){
16                 if(b.compareTo(f[i]) < 0) break;
17                 if(a.compareTo(f[i]) > 0) continue;
18                 ans++;
19             }
20             System.out.println(ans);
21         }
22     }
23 
24     public static BigInteger [] init(){
25         BigInteger [] f = new BigInteger[1000];
26         f[0] = BigInteger.valueOf(1);f[1] = BigInteger.valueOf(2);
27         for(int i=2; i<1000; i++){
28             f[i] = f[i-1].add(f[i-2]);
29             String tmp = f[i].toString();
30             if(tmp.length() > 100) {
31                 len = i;
32                 break;        
33             }
34         }
35         return f;
36     }
37 }
View Code

 

posted @ 2014-03-31 16:08  张小豪  阅读(144)  评论(0编辑  收藏  举报