You might remember the definition of the Fibonacci numbers (at this point in your study of computer science, you should have already dreamt of these at least once):
\( f_1 := 1 \)
\( f_2 := 2 \)
\( f_n := f_{n1} + f_{n2} \)
Given two numbers \(a\) and \(b\), calculate how many Fibonacci numbers there are in the range \([a, b]\).
The input contains several test cases. Each test case consists of two nonnegative integer numbers \(a\) and \(b\). Input is terminated by \(a = b = 0\). Otherwise, \(a \leq b \leq 10^{100}\).
For each test case output on a single line the number of Fibonacci numbers \(f_i\) with \(a \leq f_i \leq b\).
10 100
1234567890 9876543210
0 0
5
4
This is challenge 10183 of the ACM International Collegiate Programming Contest. Test input is provided by uDebug.
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Difficulty 

Average test runtime  0.25 
Points (changes over time)  10 
Tried by  11 users 
Solved by  10 users 
#  Name  Runtime  Points worth 

1  Pascal  0.14  15 
2  Mac  0.15  14 
3  ,s/java/NaN/gi  0.15  14 
4  贝尔恩德  0.20  11 
5  Justin  0.20  11 
6  Irfan  0.20  11 
7  JB  0.26  8 
8  Skøgland  0.32  7 
9  AlexanderP  0.41  5 
10  IeM  0.43  5 