Problem: Find Median from Data Stream

Statement

Design a data structure that stores a dynamically changing list of integers and can find the median in constant time, $O(1)$, as the list grows. To do that, implement a class named MedianOfStream with the following functionality:

• Constructor(): Initializes an instance of the class.

• InsertNum(int num): Adds a new integer num to the data structure.

• FindMedian(): Returns the median of all integers added so far.

Note: The median is the middle value in a sorted list of integers.

• For an odd-sized list (e.g., $[4, 5, 6]$), the median is the middle element: $5$.

• For an even-sized list (e.g., $[2, 4, 6, 8]$ ...