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Solution: All O`one Data Structure

Explore how to implement the AllOne data structure that supports incrementing, decrementing, and retrieving keys with max or min frequencies in O(1) time. Understand the use of a doubly linked list combined with hash maps to efficiently manage frequency nodes and key sets.

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Statement

Design a data structure that tracks the frequency of string keys and allows for efficient updates and queries.

Implement the AllOne class with these methods:

  • Constructor: Initializes the data structure.

  • inc(String key): Increases the count of the given key by 11 ...