大数斐波那契比较 杭电1316 JAVA

Problem Description

Recall the definition of the Fibonacci numbers:
f1 := 1
f2 := 2
fn := fn-1 + fn-2 (n >= 3)

Given two numbers a and b, calculate how many Fibonacci numbers are in the range [a, b].

Input

The input contains several test cases. Each test case consists of two non-negative integer numbers a and b. Input is terminated by a = b = 0. Otherwise, a <= b <= 10^100. The numbers a and b are given with no superfluous leading zeros.

Output

For each test case output on a single line the number of Fibonacci numbers fi with a <= fi <= b.

Sample Input

10 100
1234567890 9876543210
0 0

Sample Output

5
4
import java.math.BigInteger;
import java.util.Scanner;


class Main {
	public static void main(String[] args) {
		int sum = 0;
		BigInteger []b = new BigInteger[1005];
		b[1] = BigInteger.valueOf(1);
		b[2] = BigInteger.valueOf(2);
		for(int i=3;i<1005;i++){
			b[i] = b[i-1].add(b[i-2]);
		}
		Scanner s = new Scanner(System.in);
		while(s.hasNextBigInteger()){
			BigInteger n = s.nextBigInteger();
			BigInteger m = s.nextBigInteger();
			if(n.compareTo(BigInteger.ZERO)==0&&m.compareTo(BigInteger.ZERO)==0) return;
			if(n.compareTo(m)>0){
				BigInteger tt = n;
				n = m;
				m = tt;
				
			}
			for(int i=1;i<1005;i++){
				if(b[i].compareTo(n)>=0&&b[i].compareTo(m)<=0){
					sum++;
				}
			}
			System.out.println(sum);
			sum = 0;
		}
	}
}