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Solution: Maximum Frequency Stack

Explore how to design and implement a frequency stack that supports push and pop operations. Learn optimized methods to track element frequencies and retrieve the most frequent items efficiently using hash maps and stacks. This lesson helps you understand improving time complexity to constant time for such operations.

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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:

  • FreqStack: This is a class 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, 2×1032 \times 10^3 ...