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Grokking the Coding Interview Patterns in Python

Solution: Maximum Frequency Stack

Explore how to implement a maximum frequency stack data structure that supports push and pop operations with optimal time complexity. Understand the use of frequency counting and group stacks to efficiently track and retrieve the most frequent element, and handle ties by recentness. This lesson helps you master an advanced stack pattern useful in coding interviews.

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Statement

Design a stack-like data structure. You should be able to push elements to this data structure and pop elements with maximum frequency.

You’ll need to implement the FreqStack class that should consist of the following:

  • Init(): This is a constructor used to declare a frequency stack.

  • Push(value): This is used to push an integer data onto the top of the stack.

  • Pop(): This is used to remove and return the most frequent element in the stack.

Note: If there is a tie for the most frequent element, then the most recently pushed element is removed and returned.

Constraints:

  • 0≤0 \leq value ≤104\leq 10^4

  • At most, ...