Letter Queue
在计算机科学中，队列是一种特殊的数据类型，其中集合中的实体按顺序排列，对集合的主要操作是将实体添加到后端位置（enqueue 或 push），以及将实体从前端位置移除（dequeue 或 pop）。这使得队列成为一种先进先出（FIFO）数据结构。在先进先出数据结构中，第一个加入队列的元素将是第一个被移除的元素。这相当于要求一旦添加了一个新元素，就必须先移除之前添加的所有元素，然后才能移除新元素。
我们将用 Python 来模拟队列过程。我们将得到一系列命令
- "PUSH X" - enqueueX ，其中X 是一个大写字母。
- "POP" - 如果队列为空，则什么也不做。
队列只能包含字母。
您应处理所有命令，并将队列中的字母以一个单词的形式从队列的前部向后部排列。
我们来看一个例子，下面是命令的顺序：
["PUSH A", "POP",...
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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