Nicola takes a moment to study the ghosts. He is trying to think up a new method to determine just how old these ghosts are. He knows that their age is somehow related to their opacity. To measure their opacity Nikola uses a scale of 10000 units to 0 units, where 10000 is a completely opaque newborn ghost (0 years old) and 0 is completely transparent ghost (of an unknown age).
After some experimenting, Nikola thinks he has discovered the law of ghostly opacity. On every birthday, a ghost's opacity is reduced by a number of units equal to its age when its age is a Fibonacci number ( Read about this here ) or increased by 1 if it is not.
A newborn ghost -- 10000 units of opacity.
1 year -- 10000 - 1 = 9999 (1 is a Fibonacci number).
2 year -- 9999 - 2 = 9997 (2 is a Fibonacci number).
3 year -- 9997 - 3 = 9994 (3 is a Fibonacci number).
4 year -- 9994 + 1 = 9995 (4 is not a Fibonacci number).
5 year -- 9995 - 5 = 9990 (5 is a Fibonacci number).
Help Nicola write a function which will determine the age of a ghost based on its opacity. You are given opacity measurements as a number ranging from 0 to 10000 inclusively. The ghosts cannot be older than 5000 years as they simply disappear after such a long time (really!).
This is a Halloween task so you should try and write a "magic" or "scary" solution. Please, do not write "regular" solution.
Input: An opacity measurement as an integer.
Output: The age of the ghost as an integer.
checkio(10000) == 0 checkio(9999) == 1 checkio(9997) == 2 checkio(9994) == 3 checkio(9995) == 4 checkio(9990) == 5
How it is used: This task was made for some spooky fun! We hope to see your funny, tricky and creative solutions!
age < 5000
0 < opacity ≤ 10000
CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.
In order to install CheckiO client you'll need installed Python (version at least 3.8)
Install CheckiO Client first:
pip3 install checkio_client
Configure your tool
checkio --domain=py config --key=
Sync solutions into your local folder
(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)
checkio serv -d
Alternatevly, you can install Chrome extension or FF addon
checkio install-plugin --ff
checkio install-plugin --chromium