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Grokking the Coding Interview Patterns in JavaScript

Solution: Min Stack

Explore how to implement a custom Min Stack class in JavaScript that supports standard stack operations along with retrieving the minimum value in O(1) time. This lesson guides you through designing methods like push, pop, and minNumber using two stacks to maintain efficient time complexity and optimal space usage.

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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) ...