numbers-How many Fibs

How many Fibs

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<=10100. 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

最佳回答：

http://blog.csdn.net/y990041769/article/details/18269859