HackerRank Prepare Solutions

This repository consists of solutions to HackerRank prepare section with python, will be updated regularly. Be sure to ⭐ this repo so you can keep up to date on any progress!

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Python

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Subdomain	Difficulty	Challenge	Solution
Introduction	Easy	Say "Hello, World!" With Python	Python-Solution
Introduction	Easy	Python If-Else	Python-Solution
Introduction	Easy	Arithmetic Operators	Python-Solution
Introduction	Easy	Python: Division	Python-Solution
Introduction	Easy	Loops	Python-Solution
Introduction	Easy	Print Function	Python-Solution
Introduction	Medium	Write a function	Python-Solution
Basic Data Types	Easy	List Comprehensions	Python-Solution
Basic Data Types	Easy	Find the Runner-Up Score!	Python-Solution
Basic Data Types	Easy	Nested Lists	Python-Solution
Basic Data Types	Easy	Finding the percentage	Python-Solution
Basic Data Types	Easy	Lists	Python-Solution
Basic Data Types	Easy	Tuples	Python-Solution
Strings	Easy	sWAP cASE	Python-Solution
Strings	Easy	String Split and Join	Python-Solution
Strings	Easy	What's Your Name?	Python-Solution
Strings	Easy	Mutations	Python-Solution
Strings	Easy	Find a string	Python-Solution
Strings	Easy	String Validators	Python-Solution
Strings	Easy	Text Alignment	Python-Solution
Strings	Easy	Text Wrap	Python-Solution
Strings	Easy	Designer Door Mat	Python-Solution
Strings	Easy	String Formatting	Python-Solution
Strings	Easy	Alphabet Rangoli	Python-Solution
Strings	Easy	Capitalize!	Python-Solution
Strings	Medium	The Minion Game	Python-Solution
Strings	Medium	Merge the Tools!	Python-Solution
Sets	Easy	Introduction to Sets	Python-Solution
Sets	Easy	Symmetric Difference	Python-Solution
Sets	Easy	Set .add()	Python-Solution
Sets	Easy	Set .discard(), .remove() & .pop()	Python-Solution
Sets	Easy	Set .union() Operation	Python-Solution
Sets	Easy	Set .intersection() Operation	Python-Solution
Sets	Easy	Set .difference() Operation	Python-Solution
Sets	Easy	Set .symmetric_difference() Operation	Python-Solution
Sets	Easy	Set Mutations	Python-Solution
Sets	Easy	The Captain's Room	Python-Solution
Sets	Easy	Check Subset	Python-Solution
Sets	Easy	Check Strict Superset	Python-Solution
Sets	Medium	No Idea!	Python-Solution
Math	Easy	Polar Coordinates	Python-Solution
Math	Easy	Mod Divmod	Python-Solution
Math	Easy	Power - Mod Power	Python-Solution
Math	Easy	Integers Come In All Sizes	Python-Solution
Math	Medium	Find Angle MBC	Python-Solution
Math	Medium	Triangle Quest 2	Python-Solution
Math	Medium	Triangle Quest	Python-Solution
Itertools	Easy	itertools.product()	Python-Solution
Itertools	Easy	itertools.permutations()	Python-Solution
Itertools	Easy	itertools.combinations()	Python-Solution
Itertools	Easy	itertools.combinations_with_replacement()	Python-Solution
Itertools	Medium	Compress the String!	Python-Solution
Itertools	Medium	Iterables and Iterators	Python-Solution
Itertools	Hard	Maximize It!	Python-Solution
Collections	Easy	collections.Counter()	Python-Solution
Collections	Easy	DefaultDict Tutorial	Python-Solution
Collections	Easy	Collections.namedtuple()	Python-Solution
Collections	Easy	Collections.OrderedDict()	Python-Solution
Collections	Easy	Collections.deque()	Python-Solution
Collections	Medium	Word Order	Python-Solution
Collections	Medium	Company Logo	Python-Solution
Collections	Medium	Piling Up!	Python-Solution
Date and Time	Easy	Calendar Module	Python-Solution
Date and Time	Medium	Time Delta	Python-Solution
Errors and Exceptions	Easy	Exceptions	Python-Solution
Errors and Exceptions	Easy	Incorrect Regex	Python-Solution
Classes	Easy	Class 2 - Find the Torsional Angle	Python-Solution
Classes	Medium	Classes: Dealing with Complex Numbers	Python-Solution
Built-Ins	Easy	Zipped!	Python-Solution
Built-Ins	Easy	Input()	Python-Solution
Built-Ins	Easy	Python Evaluation	Python-Solution
Built-Ins	Easy	Any or All	Python-Solution
Built-Ins	Medium	Athlete Sort	Python-Solution
Built-Ins	Medium	ginortS	Python-Solution
Python Functionals	Easy	Map and Lambda Function	Python-Solution
Python Functionals	Medium	Validating Email Addresses With a Filter	Python-Solution
Python Functionals	Medium	Reduce Function	Python-Solution
Regex and Parsing	Easy	Detect Floating Point Number	Python-Solution
Regex and Parsing	Easy	Re.split()	Python-Solution
Regex and Parsing	Easy	Group(), Groups() & Groupdict()	Python-Solution
Regex and Parsing	Easy	Re.findall() & Re.finditer()	Python-Solution
Regex and Parsing	Easy	Re.start() & Re.end()	Python-Solution
Regex and Parsing	Easy	Validating Roman Numerals	Python-Solution
Regex and Parsing	Easy	Validating phone numbers	Python-Solution
Regex and Parsing	Easy	Validating and Parsing Email Addresses	Python-Solution
Regex and Parsing	Easy	Hex Color Code	Python-Solution
Regex and Parsing	Easy	HTML Parser - Part 1	Python-Solution
Regex and Parsing	Easy	HTML Parser - Part 2	Python-Solution
Regex and Parsing	Easy	Detect HTML Tags, Attributes and Attribute Values	Python-Solution
Regex and Parsing	Easy	Validating UID	Python-Solution
Regex and Parsing	Medium	Regex Substitution	Python-Solution
Regex and Parsing	Medium	Validating Credit Card Numbers	Python-Solution
Regex and Parsing	Hard	Validating Postal Codes	Python-Solution
Regex and Parsing	Hard	Matrix Script	Python-Solution
XML	Easy	XML 1 - Find the Score	Python-Solution
XML	Easy	XML2 - Find the Maximum Depth	Python-Solution
Closures and Decorators	Easy	Standardize Mobile Number Using Decorators	Python-Solution
Closures and Decorators	Easy	Decorators 2 - Name Directory	Python-Solution
Numpy	Easy	Arrays	Python-Solution
Numpy	Easy	Shape and Reshape	Python-Solution
Numpy	Easy	Transpose and Flatten	Python-Solution
Numpy	Easy	Concatenate	Python-Solution
Numpy	Easy	Zeros and Ones	Python-Solution
Numpy	Easy	Eye and Identity	Python-Solution
Numpy	Easy	Array Mathematics	Python-Solution
Numpy	Easy	Floor, Ceil and Rint	Python-Solution
Numpy	Easy	Sum and Prod	Python-Solution
Numpy	Easy	Min and Max	Python-Solution
Numpy	Easy	Mean, Var, and Std	Python-Solution
Numpy	Easy	Dot and Cross	Python-Solution
Numpy	Easy	Inner and Outer	Python-Solution
Numpy	Easy	Polynomials	Python-Solution
Numpy	Easy	Linear Algebra	Python-Solution
Debugging	Medium	Words Score	Python-Solution
Debugging	Medium	Default Arguments	Python-Solution

SQL

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Subdomain	Difficulty	Challenge	Solution
Basic Select	Easy	Revising the Select Query I	MySQL-Solution
Basic Select	Easy	Revising the Select Query II	MySQL-Solution
Basic Select	Easy	Select All	MySQL-Solution
Basic Select	Easy	Select By ID	MySQL-Solution
Basic Select	Easy	Japanese Cities' Attributes	MySQL-Solution
Basic Select	Easy	Japanese Cities' Names	MySQL-Solution
Basic Select	Easy	Weather Observation Station 1	MySQL-Solution
Basic Select	Easy	Weather Observation Station 3	MySQL-Solution
Basic Select	Easy	Weather Observation Station 4	MySQL-Solution
Basic Select	Easy	Weather Observation Station 5	MySQL-Solution
Basic Select	Easy	Weather Observation Station 6	MySQL-Solution
Basic Select	Easy	Weather Observation Station 7	MySQL-Solution
Basic Select	Easy	Weather Observation Station 8	MySQL-Solution
Basic Select	Easy	Weather Observation Station 9	MySQL-Solution
Basic Select	Easy	Weather Observation Station 10	MySQL-Solution
Basic Select	Easy	Weather Observation Station 11	MySQL-Solution
Basic Select	Easy	Weather Observation Station 12	MySQL-Solution
Basic Select	Easy	Higher Than 75 Marks	MySQL-Solution
Basic Select	Easy	Employee Names	MySQL-Solution
Basic Select	Easy	Employee Salaries	MySQL-Solution
Advanced Select	Easy	Type of Triangle	MySQL-Solution
Advanced Select	Medium	The PADS	MySQL-Solution
Advanced Select	Medium	Occupations	MySQL-Solution
Advanced Select	Medium	Binary Tree Nodes	MySQL-Solution
Advanced Select	Medium	New Companies	MySQL-Solution
Aggregation	Easy	Revising Aggregations - The Count Function	MySQL-Solution
Aggregation	Easy	Revising Aggregations - The Sum Function	MySQL-Solution
Aggregation	Easy	Revising Aggregations - Averages	MySQL-Solution
Aggregation	Easy	Average Population	MySQL-Solution
Aggregation	Easy	Japan Population	MySQL-Solution
Aggregation	Easy	Population Density Difference	MySQL-Solution
Aggregation	Easy	The Blunder	MySQL-Solution
Aggregation	Easy	Top Earners	MySQL-Solution
Aggregation	Easy	Weather Observation Station 2	MySQL-Solution
Aggregation	Easy	Weather Observation Station 13	MySQL-Solution
Aggregation	Easy	Weather Observation Station 14	MySQL-Solution
Aggregation	Easy	Weather Observation Station 15	MySQL-Solution
Aggregation	Easy	Weather Observation Station 16	MySQL-Solution
Aggregation	Easy	Weather Observation Station 17	MySQL-Solution
Aggregation	Medium	Weather Observation Station 18	MySQL-Solution
Aggregation	Medium	Weather Observation Station 19	MySQL-Solution
Aggregation	Medium	Weather Observation Station 20	MySQL-Solution
Basic Join	Easy	Asian Population	MySQL-Solution
Basic Join	Easy	African Cities	MySQL-Solution
Basic Join	Easy	Average Population of Each Continent	MySQL-Solution
Basic Join	Medium	The Report	MySQL-Solution
Basic Join	Medium	Top Competitors	MySQL-Solution
Basic Join	Medium	Ollivander's Inventory	MySQL-Solution
Basic Join	Medium	Challenges	MySQL-Solution
Basic Join	Medium	Contest Leaderboard	MySQL-Solution
Advanced Join	Medium	Projects	MySQL-Solution
Advanced Join	Medium	Placements	MySQL-Solution
Advanced Join	Medium	Symmetric Pairs	MySQL-Solution
Advanced Join	Hard	Interviews	MySQL-Solution
Advanced Join	Hard	15 Days of Learning SQL	MySQL-Solution
Alternative Queries	Easy	Draw The Triangle 1	MySQL-Solution
Alternative Queries	Easy	Draw The Triangle 2	MySQL-Solution
Alternative Queries	Medium	Print Prime Numbers	MySQL-Solution

Java

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Subdomain	Difficulty	Challenge	Solution
Introduction	Easy	Welcome to Java!	Java-Solution
Introduction	Easy	Java Stdin and Stdout I	Java-Solution
Introduction	Easy	Java If-Else	Java-Solution
Introduction	Easy	Java Stdin and Stdout II	Java-Solution
Introduction	Easy	Java Output Formatting	Java-Solution
Introduction	Easy	Java Loops I	Java-Solution
Introduction	Easy	Java Loops II	Java-Solution
Introduction	Easy	Java Datatypes	Java-Solution
Introduction	Easy	Java End-of-file	Java-Solution
Introduction	Easy	Java Static Initializer Block	Java-Solution
Introduction	Easy	Java Int to String	Java-Solution
Introduction	Easy	Java Date and Time	Java-Solution
Introduction	Easy	Java Currency Formatter	Java-Solution
Strings	Easy	Java Strings Introduction	Java-Solution
Strings	Easy	Java Substring	Java-Solution
Strings	Easy	Java Substring Comparisons	Java-Solution
Strings	Easy	Java String Reverse	Java-Solution
Strings	Easy	Java Anagrams	Java-Solution
Strings	Easy	Java String Tokens	Java-Solution
Strings	Easy	Pattern Syntax Checker	Java-Solution
Strings	Easy	Valid Username Regular Expression	Java-Solution
Strings	Medium	Tag Content Extractor	Java-Solution
Strings	Medium	Java Regex	Java-Solution
Strings	Medium	Java Regex 2 - Duplicate Words	Java-Solution
BigInteger	Easy	Java BigInteger	Java-Solution
BigInteger	Medium	Java BigDecimal	Java-Solution
BigInteger	Easy	Java Primality Test	Java-Solution
Data Structures	Easy	Java 1D Array	Java-Solution
Data Structures	Easy	Java 2D Array	Java-Solution
Data Structures	Easy	Java Subarray	Java-Solution
Data Structures	Easy	Java Arraylist	Java-Solution
Data Structures	Easy	Java Map	Java-Solution
Data Structures	Easy	Java Hashset	Java-Solution
Data Structures	Medium	Java Comparator	Java-Solution
Data Structures	Easy	Java Sort	Java-Solution
Data Structures	Easy	Java List	Java-Solution
Data Structures	Easy	Java Generics	Java-Solution
Data Structures	Medium	Java Stack	Java-Solution
Data Structures	Medium	Java Dequeue	Java-Solution
Data Structures	Easy	Java BitSet	Java-Solution
Data Structures	Medium	Java Priority Queue	Java-Solution
Data Structures	Medium	Java 1D Array (Part 2)	Java-Solution
Object Oriented Programming	Easy	Java Inheritance I	Java-Solution
Object Oriented Programming	Easy	Java Inheritance II	Java-Solution
Object Oriented Programming	Easy	Java Abstract Class	Java-Solution
Object Oriented Programming	Easy	Java Interface	Java-Solution
Object Oriented Programming	Easy	Java Method Overriding	Java-Solution
Object Oriented Programming	Easy	Java Method Overriding 2(Super Keyword)	Java-Solution
Object Oriented Programming	Easy	Java Instanceof keyword	Java-Solution
Object Oriented Programming	Easy	Java Iterator	Java-Solution
Exception Handling	Easy	Java Exception Handling (Try-catch)	Java-Solution
Exception Handling	Easy	Java Exception Handling	Java-Solution
Advanced	Easy	Java Varargs - Simple Addition	Java-Solution
Advanced	Easy	Java Reflection - Attributes	Java-Solution
Advanced	Medium	Can You Access?	Java-Solution
Advanced	Medium	Java Factory Pattern	Java-Solution
Advanced	Easy	Java Singleton Pattern	Java-Solution
Advanced	Easy	Covariant Return Types	Java-Solution
Advanced	Medium	Prime Checker	Java-Solution
Advanced	Medium	Java Annotations	Java-Solution
Advanced	Easy	Java Lambda Expressions	Java-Solution
Advanced	Medium	Java MD5	Java-Solution
Advanced	Medium	Java SHA-256	Java-Solution
Advanced	Medium	Java Visitor Pattern	Java-Solution