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Grokking the Coding Interview Patterns

Solution: Min Stack

Explore how to implement a custom Min Stack that maintains constant time operations for push, pop, and fetching the minimum value. Understand the usage of two stacks—main and min stack—to track elements and their minimum efficiently, ensuring optimal performance in complex coding challenges.

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Statement

Design a custom stack class, Min Stack, allowing us to push, pop, and retrieve the minimum value in constant time. Implement the following methods for Min Stack:

  • Constructor: This initializes the Min Stack object.

  • Pop(): This removes and returns from the stack the value that was most recently pushed onto it.

  • Push(): This pushes the provided value onto the stack.

  • Min Number(): This returns the minimum value in the stack in O(1)O(1) ...