This repository contains solutions to the problems found on HackerRank.

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Problem Solving

Algorithms

Warmup

Challenge	Solution
Solve Me First	Solve Me First.py
Simple Array Sum	Simple Array Sum.py
Compare the Triplets	Compare Triplets.py
A Very Big Sum	Big Sum.py
Plus Minus	Plus Minus.py
Staircase	Staircase.py
Mini-Max Sum	Mini Max Sum.py
Birthday Cakes Candles
Time Conversion	Time Conversion.py
Diagonal Difference
Compare Triplets	Compare Triplets.py

Implementation

Challenge	Solution
Sales by Match	Sales by Match.py
Cats and a Mouse	Cats and a Mouse.py

Strings

Challenge	Solution
CamelCase	CamelCase.py
Pangrams	Pangrams.py
Funny String	Funny String.py
Alternating Characters	Alternating Characters.py

Sorting

Challenge	Solution

Search

Challenge	Solution

Graph Theory

Challenge	Solution

Greedy

Challenge	Solution

Dynamic Programming

Challenge	Solution

Constructive Algorithms

Challenge	Solution

Bit Manipulation

Challenge	Solution

Recursion

Challenge	Solution

Game Theory

Challenge	Solution

NP Complete

Challenge	Solution

Debugging

Challenge	Solution

Data Structures

Arrays

Challenge	Solution

Linked Lists

Challenge	Solution

Trees

Challenge	Solution

Balanced Trees

Challenge	Solution

Stacks

Challenge	Solution

Queues

Challenge	Solution

Heap

Challenge	Solution

Disjoint Set

Challenge	Solution

Multiple Choice

Challenge	Solution

Trie

Challenge	Solution

Advanced

Challenge	Solution

Python

Introduction

Challenge	Solution
Say "Hello, World!" with Python	Say Hello World With Python.py
Python If-Else	If-Else.py
Arithmetic Operators	Arithmetic Operators.py
Python: Division	Division.py
Loops	Loops.py
Write a function	Write a function.py
Print Function	Print Function.py

Basic Data Types

Challenge	Solution
List Comprehensions	List Comprehensions.py
Find the Runner-Up Score!	Find the Runner-Up Score.py
Nested Lists	Nested Lists.py
Finding the Percentage	Finding the Percentage.py
Lists	Lists.py
Tuples	Tuples.py

Strings

Challenge	Solution
sWAP cASE
String Split Join	String Split Join.py
What's Your Name	What's Your Name.py
Mutations
String Validators
Text Alignment
Text Wrap	Text Wrap.py
Designer Door Mat
String Formatting
Alphabet Rangoli
Capitalize
The Minion Game
Merge the Tools!

Sets

Challenge	Solution
Introduciton to Sets	Introduction to Sets.py
No Idea	No Idea.py
Symmetric Difference	Symmetric Difference.py
Set .add()	Set .add().py
Set .discard(), .remove() & .pop()	Set .discard(), .remove() .pop().py
Set .union() Operation	Set .union() Operation.py
Set .intersection() Operation	Set .intersection() Operation.py
Set .difference() Operation	Set .difference() Operation.py
Set .symmetric_difference() Operation	Set .symmetric_difference() Operation.py
Set Mutations	Set Mutations.py
Check Subset
Check Strict Superset
The Captain's Room

Math

Challenge	Solution
Polar Coordinates
Find Angle MBC
Triangle Quest
Triangle Quest 2
Mod Divmod	Mod Divmod.py
Power - Mod Power	Power-Mod Power.py
Integers Come In All Sizes	Integers All Sizes.py

Itertools

Challenge	Solution
itertools.product()
itertools.permutations()
itertools.combinations()
itertools.combinations_with_replacement()
Compress the String!
Iterables and Iterators
Maximize It!

Collections

Challenge	Solution
collections.Counter()
DefaultDict Tutorial
Collections.nametuple()
Collections.OrderDict()
Word Order
Collections.deque()
Company Logo
Piling Up!

Date and Time

Challenge	Solution
Calendar Module	Calendar Module.py
Time Delta

Errors and Exceptions

Challenge	Solution
Exceptions	Exceptions.py
Incorrect Regex

Classes

Challenge	Solution
Classes: Dealing with Complex Numbers
Class 2 - Find the Torsional Angle

Built-Ins

Challenge	Solution
Input()
Python Evaluation	Evaluation.py
Athlete Sort
Any or All	Any or All.py
ginortS

Python Functionals

Challenge	Solution
Map and Lambda Function
Validating Email Addresses With a Filter
Reduce Function

Regex and Parsing

Challenge	Solution
Detect Floating Point Number
Re.split()
Group(), Groups() & Groupdict()
Re.findall() & Re.finditer()
Re.start() & Re.end()
Regex Substitution
Validating Roman Numerals
Validating phone numbers
Validating and Parsing Email Addresses
Hex Color Code
HTML Parser - Part 1
HTML Parser - Part 2
Detecting HTML Tags, Attribites and Attribute Values
Validating UID
Validating Credit Card Numbers
Validating Postal Codes
Matrix Script

XML

Challenge	Solution
XML 1 - Find the Score
XML 2 - Find the Maximum Depth

Closures and Decorators

Challenge	Solution
Standardize Mobile Number Using Decorators
Decorators 2 - Name Directory

Numpy

Challenge	Solution
Arrays
Transpose and Flatten
Shape and Reshape
Concatenate
Zeros and Ones
Eye and Identity
Array Mathematics
Floor, Ceil, Rint
Sum and Prod
Min and Max
Mean, Var, and Std
Dot and Cross
Inner and Outer
Polynomials
Linear Algebra

Debugging

Challenge	Solution
Words Scores
Default Arguments

SQL

Basic Select

Challenge	Solution
Revising the Select Query 1	Revising the Select Query 1.sql
Revising the Select Query 2	Revising the Select Query 2.sql
Select All	Select All.sql
Select By ID	Select By ID.sql
Japanese Cities' Attributes	Japanese Cities' Attributes.sql
Japanese Cities' Names	Japanese Cities' Names.sql
Weather Observation 1	Weather Observation 1.sql
Weather Observation 3	Weather Observation 3.sql
Weather Observation 4	Weather Observation 4.sql
Weather Observation 5	Weather Observation 5.sql
Weather Observation 6	Weather Observation 6.sql
Weather Observation 7	Weather Observation 7.sql
Weather Observation 8	Weather Observation 8.sql
Weather Observation 9	Weather Observation 9.sql
Weather Observation 10	Weather Observation 10.sql
Weather Observation 11	Weather Observation 11.sql
Weather Observation 12	Weather Observation 12.sql
Higher Than 75 Marks	Higher Than 75 Marks.sql
Employee Names	Employee Names.sql
Employee Salaries	Employee Salaries.sql

Advanced Select

Challenge	Solution
Type of Triangle
Occupations
Binary Tree Nodes
New Companies
The PADS

Aggregation

Challenge	Solution
Revising Aggregations-The Count Function
Revising Aggregations-The Sum Function
Revising Aggregations-Averages
Average Population
Japan Population
Population Density Difference
The Blunder
Top Earners
Weather Observation 2
Weather Observation 13
Weather Observation 14
Weather Observation 15
Weather Observation 16
Weather Observation 17
Weather Observation 18
Weather Observation 19
Weather Observation 20

Basic Join

Challenge	Solution
Asian Population
African Cities
Average Population of Each Continent
Top Competitors
The Report
Ollivander's Inventory
Challenges
Contest Leader

Advanced Join

Challenge	Solution
Projects
Placements
Symmetric Pairs
Interviews
15 Days of Learning SQL

Alternative Queries

Challenge	Solution
Draw The Triangle 1	Draw The Triangle 1.sql
Draw The Triangle 2	Draw The Triangle 2.sql
Print Prime Numbers	Print Prime Numbers.sql