How many Fibs?
Time Limit: 1000 ms Memory Limit: 65536 KiB
Recall the definition of the Fibonacci numbers:
f1 := 1Given two numbers a and b, calculate how many Fibonacci numbers are in the range [a,b].
f2 := 2
fn := fn-1 + fn-2 (n>=3)
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 aand b are given with no superfluous leading zeros.
For each test case output on a single line the number of Fibonacci numbers fi with a<=fi<=b.
10 100 1234567890 9876543210 0 0
2000/2001 University of Ulm Local Contest