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Solution: Min Stack

Explore how to implement a custom Min Stack data structure that allows push, pop, and minimum value retrieval in O(1) time. Understand using two stacks to track elements and track the current minimum efficiently while maintaining optimal time and space complexity.

Statement

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

  • NewMinStack(): 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) ...