Photo by Markus Spiske on Unsplash

Write a function to find the length of the longest common subsequence between two sequences.

E.g. Given the strings “serendipitous” and “precipitation”, the longest common subsequence is “reipito” and its length is 7.

Recursive approach

Photo by Soraya Irving on Unsplash

"Sorting" essentially refers to "sorting in ascending order", unless specified otherwise.

Sorting algorithms are capable of doing multiple and extraordinary things, imagine how much time it would take for a human to sort a list of thousands of names to make a phonebook, or a list of thousands of recipes, archives, animals, etc.

Let’s create a list of numbers to be sorted as an example !

nums: A list of numbers e.g. [4, 2, 6, 3, 4, 6, 2, 1]

1. Bubble Sort

It is called by this name because herein smaller elements to bubble to the top and larger to sink to…

Wondering how to do that?! Well, then continue reading… :)

As it is well known that Python Dictionaries are a data structure which are used to store key-value pairs; where “keys” are used to store and retrieve the stored “values”. For example, here is a dictionary for storing and retrieving the marks of students in a class;

# Creating a dictionary
result =
'A' : '20',
'B' : '15',
'C' : '10'
# Retrieving the marks using key value(here, name)
# Add a new value
result['Z'] = '9'
# Update existing value
result['A'] = '11'

A linked list is a data structure used for storing a sequence of elements. It’s data with some structure (the sequence).

Implementation of Linked List

class LinkedList(): def __init__(self): self.head = None def append(self, value): if self.head is None: self.head = Node(value) else: current_node = self.head while is not None: current_node = = Node(value) def show_elements(self): current = self.head while current is not None: print( current = def length(self): result = 0 current = self.head while current is not None: result += 1 current = return result def get_element(self, position): i = 0 current = self.head while current is…

An illustration of inverted tree trunk for better understanding.

Why is it called a tree?

It’s called a “tree” because it vaguely resembles an inverted tree trunk with branches.

A Binary Tree

Aditi Deodhar

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