Collatz Ztalloc
Collatz conjecture 是数学中最著名的未解难题之一。不过，科拉茨数列也可以用二进制的方式来看待，这取决于每个值是在前一个值的基础上步进up (3x+1) 还是down (x/2)，分别用"u", "d" 表示这些步进。例如，从 n=12 开始，下面是序列和步形：
根据data 类型，函数必须返回起始值（如果给出的是字符串形状的字母"u", "d" ）或步长形状（如果给出的是数值）。
该函数还必须认识到，根据科拉茨转换规则，某些形状字符串是不可能的，因此必须正确返回 None返回所有此类形状。您应该从目标状态 1 开始，反向执行给定的转换。在此过程中，您必须确保您的函数不接受在最初的正向科拉兹序列中不合法的移动。
输入字符串 (str)或整数 (int).
输出：字符串 (str), 整数 (int)或无 。
示例：...
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
checkio sync
(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
checkio install-plugin --ff
checkio install-plugin --chromium
Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.
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