add function to generate a random unique 5x5 board of numbers where each column follows certain conditions

update investmentStrategy function

add function to count how many intervals to remove to have non overlapping interval of numbers

add function to calculate max product of a subarray given an array of numbers

add function to check if an array of edges makes a valid tree

add function to check if an array of edges contains a redundant connection

add function to return a list of chars in an alien dictionary

add function to return the order of courses required to finish all courses

add function to check if user can finish all courses given a list of prerequisites

add function to calculate time taken to BFS transform cells in a 2d grid

add functions for calculating surrounded regions in a 2d grid

add function to return a 2d list of grid coordinates that can flow to both Pacific and Atlantic Oceans

update function to find the median of two sorted arrays

implement a class that will serve as a time based key-value store

add function to find target number in rotated sorted array