2492. Revenge of Fibonacci
#2492. Revenge of Fibonacci
题目描述
The well-known Fibonacci sequence is defined as following:
Here we regard n as the index of the Fibonacci number F(n).
This sequence has been studied since the publication of Fibonacci's book
Liber Abaci. So far, many properties of this sequence have been introduced.
You had been interested in this sequence, while after reading lots of papers
about it. You think there's no need to research in it anymore because of the
lack of its unrevealed properties. Yesterday, you decided to study some other
sequences like Lucas sequence instead.
Fibonacci came into your dream last night. "Stupid human beings. Lots of
important properties of Fibonacci sequence have not been studied by anyone,
for example, from the Fibonacci number 347746739…"
You woke up and couldn't remember the whole number except the first few
digits Fibonacci told you. You decided to write a program to find this number
out in order to continue your research on Fibonacci sequence.
输入一串数字，判断为第几个fib数的前缀，如有多个输出最前面的，不存在或者大于等于100000输出-1
输入格式
There are multiple test cases. The first line of input contains a single
integer T denoting the number of test cases (T<=50000).
For each test case, there is a single line containing one non-empty string
made up of at most 40 digits. And there won't be any unnecessary leading
zeroes.
输出格式
For each test case, output the smallest index of the smallest Fibonacci number whose decimal notation begins with the given digits. If no Fibonacci number with index smaller than 100000 satisfy that condition, output -1 instead - you think what Fibonacci wants to told you beyonds your ability.
样例
样例输入
15
1
12
123
1234
12345
9
98
987
9876
98765
89
32
51075176167176176176
347746739
5610
样例输出
Case #1: 0
Case #2: 25
Case #3: 226
Case #4: 1628
Case #5: 49516
Case #6: 15
Case #7: 15
Case #8: 15
Case #9: 43764
Case #10: 49750
Case #11: 10
Case #12: 51
Case #13: -1
Case #14: 1233
Case #15: 22374