algo_3partition_list.py - partition list into 3 compartments <k, =k and >k
k_closest_point.py - Find k closest points based on distance from vertex to the given list of points
str1_str2_transform.py - source string -> dest string
matching_pairs.py - List of whole positive #s. and a number, find the complement of the number
count_island.py - Given a 2d grid of 1s (land) and 0s (water) , count the number of isalnd
delete_nodes_tree.py - delete node from a btree and return forest of tress
first_nonrepeating.py - first non repeating character
divsubs.py given a multiset of N integers. Please find such a nonempty subset of it that the sum of the subset's elements is divisible by N.