[LeetCode] All O'one Data Structure

[432. All O`one Data Structure](https://leetcode.com/problems/all-oone-data-structure/) 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...

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