432. All O`one Data Structure

全 O(1) 的数据结构

Design a data structure to store the strings' count with the ability to return the strings with minimum and maximum counts.

Implement the AllOne class:

AllOne() Initializes the object of the data structure.
inc(String key) Increments the count of the string key by 1. If key does not exist in the data structure, insert it with count 1.
dec(String key) Decrements the count of the string key by 1. If the count of key is 0 after the decrement, remove it from the data structure. It is guaranteed that key exists in the data structure before the decrement.
getMaxKey() Returns one of the keys with the maximal count. If no element exists, return an empty string "".
getMinKey() Returns one of the keys with the minimum count. If no element exists, return an empty string "".
解题重点：
1. 双向链表。跟lru类似：146. LRU Cache https://t.cn/A66MYeBF

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#英语#你知道a piece of the action是啥意思嘛？我们今天来看看几位小伙伴之间都发生了什么事情吧，第一季第二集，Johnny，Olivia和Fadi都在为Harry介绍工作。他该怎么办？
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此外，从对话中总结了这几个英语知识点：

✨a piece of the action (尤指在利益、生意、投机买卖等方面)享有一份：infml-非正式 a part of the profits or advantages that come from an activity
example：This When it comes to lawsuits, everyone seems to want a piece of the action.在法庭上，每个人都想争取一份既得利益。

✨vacancy 空缺，空职：a job that no one is doing and is therefore available for someone new to do
example：There is a vacancy for a shop assistant.目前售货员这个职位空缺着呢。

✨feed up with 对...极其厌烦：get bored, annoyed by something or somebody
example：I'm fed up with her complaining 我听够她的牢骚了。