HackerRank

Solutions to some problems on Hackerrank.

• LANGUAGE PROFICIENCY

  • C
  • C++
  • Java
  • Python
  • Shell

• Tutorials

  • 10 Days of Javascript

LANGUAGE PROFICIENCY

C

Subdomain	Difficulty	Challenge	Solution
Introduction	Easy	"Hello World!" in C	HelloWorld.c
Introduction	Easy	Playing With Characters	PlayingWithCharacters.c
Introduction	Easy	Sum and Difference of Two Numbers	SumAndDifferenceOfTwoNumbers.c
Introduction	Easy	Functions in C	FunctionsInC.c
Introduction	Easy	Pointers in C	PointersInC.c
Conditionals and Loops	Easy	Conditional Statements in C	ConditionalStatementsInC.c
Conditionals and Loops	Easy	For Loop in C	ForLoopInC.c
Conditionals and Loops	Easy	Sum of Digits of a Five Digit Number	SumOfDigitsOfAFiveDigitNumber.c
Conditionals and Loops	Easy	Bitwise Operators	BitwiseOperators.c
Conditionals and Loops	Medium	Printing Pattern using Loops	PrintingPatternsUsingLoops.c
Arrays and Strings	Medium	1D Arrays in C	1DArraysInC.c
Arrays and Strings	Medium	Array Reversal	ArrayReversal.c
Arrays and Strings	Medium	Digit Frequency	DigitFrequency.c
Arrays and Strings	Medium	Printing Tokens	PrintingTokens.c
Arrays and Strings	Medium	Dynamic Array in C	DynamicArrayInC.c
Functions	Easy	Calculate the Nth term	CalculateTheNthTerm.c
Functions	Easy	Students Marks Sum	StudentsMarksSum.c
Functions	Hard	Sorting Array of Strings	SortingArrayOfStrings.py
Functions	Medium	Permutations of Strings	PermutationsOfStrings.c
Functions	Medium	Variadic functions in C	VariadicFunctionsInC.c
Functions	Hard	Querying the Document	QueryingTheDocument.c
Structs and Enums	Easy	Boxes through a Tunnel	BoxesThroughATunnel.c
Structs and Enums	Medium	Small Triangles, Large Triangles	SmallTrianglesLargeTriangles.cpp
Structs and Enums	Hard	Post Transition	PostTransition.c
Structs and Enums	Hard	Structuring the Document	StructuringTheDocument.c

C++

Subdomain	Difficulty	Challenge	Solution
Introduction	Easy	Say "Hello, World!" With C++	SayHelloWorldWithCPlusPlus.cpp
Introduction	Easy	Input and Output	InputAndOutput.cpp
Introduction	Easy	Basic Data Types	BasicDataTypes.cpp
Introduction	Easy	Conditional Statements	ConditionalStatements.cpp
Introduction	Easy	For Loop	ForLoop.cpp
Introduction	Easy	Functions	Functions.cpp
Introduction	Easy	Pointer	Pointer.cpp
Introduction	Easy	Arrays Introduction	ArraysIntroduction.cpp
Introduction	Easy	Variable Sized Arrays	VariableSizedArrays.cpp
Strings	Easy	Strings	Strings.cpp
Strings	Easy	StringStream	StringStream.cpp
Strings	Medium	Attribute Parser	AttributeParser.cpp
Classes	Easy	Structs	Structs.cpp
Classes	Easy	Class	Class.cpp
Classes	Easy	Classes and Objects	ClassesAndObjects.cpp
Classes	Easy	Box It!	BoxIt.cpp
Classes	Medium	Inherited Code	InheritedCode.cpp
Classes	Medium	Exceptional Server	ExceptionalServer.cpp
Classes	Medium	Virtual Functions	VirtualFunctions.cpp
Classes	Hard	Abstract Classes - Polymorphism	AbstractClassesPolymorphism.cpp
Inheritance	Easy	Inheritance Introduction	InheritanceIntroduction.cpp
Inheritance	Easy	Rectangle Area	RectangleArea.cpp
Inheritance	Easy	Multi Level Inheritance	MultiLevelInheritance.cpp
Inheritance	Medium	Accessing Inherited Functions	AccessingInheritedFunctions.cpp
Inheritance	Hard	Magic Spells	MagicSpells.cpp
STL	Easy	Vector-Sort	VectorSort.cpp
STL	Easy	Vector-Erase	VectorErase.cpp
STL	Easy	Lower Bound-STL	LowerBoundStl.cpp
STL	Easy	Sets-STL	SetsStl.cpp
STL	Easy	Maps-STL	MapsStl.cpp
STL	Easy	Print Pretty	PrintPretty.cpp
STL	Medium	Deque-STL	DequeStl.cpp
Other Concepts	Easy	C++ Class Templates	ClassTemplates.cpp
Other Concepts	Easy	Preprocessor Solution	PreprocessorSolution.cpp
Other Concepts	Medium	Operator Overloading	OperatorOverloading.cpp
Other Concepts	Easy	Overload Operators	OverloadOperators.cpp
Other Concepts	Medium	Attending Workshops	AttendingWorkshops.cpp
Other Concepts	Medium	C++ Class Template Specialization	ClassTemplateSpecialization.cpp

Java

Subdomain	Difficulty	Challenge	Solution
Introduction	Easy	Welcome to Java!	WelcomeToJava.java
Introduction	Easy	Java Stdin and Stdout I	JavaStdInAndStdOut1.java
Introduction	Easy	Java If-Else	JavaIfElse.java
Introduction	Easy	Java Output Formatting	JavaOutputFormatting.java
Introduction	Easy	Java Loops I	JavaLoops1.java
Introduction	Easy	Java Loops II	JavaLoops2.java
Introduction	Easy	Java Datatypes	JavaDatatypes.java
Introduction	Easy	Java End-of-file	JavaEndOfFile.java
Introduction	Easy	Java Static Initializer Block	JavaStaticInitializerBlock.java
Introduction	Easy	Java Int to String	JavaIntToString.java
Introduction	Easy	Java Date and Time	JavaDateAndTime.java
Introduction	Easy	Java Currency Formatter	JavaCurrencyFormatter.java
Strings	Easy	Java Strings Introduction	JavaStringsIntroduction.java
Strings	Easy	Java Substring	JavaSubstring.java
Strings	Easy	Java Substring Comparisons	JavaSubstringComparisons.java
Strings	Easy	Java String Reverse	JavaStringReverse.java
Strings	Easy	Java Anagrams	JavaAnagrams.java
Strings	Easy	Java String Tokens	JavaStringTokens.java
Strings	Easy	Pattern Syntax Checker	PatternSyntaxChecker.java
Strings	Medium	Java Regex	JavaRegex.java
Strings	Medium	Java Regex 2 - Duplicate Words	JavaRegex2DuplicateWords.java
Strings	Easy	Valid Username Regular Expression	ValidUsernameRegularExpression.java
Strings	Medium	Tag Content Extractor	TagContentExtractor.java
BigNumber	Medium	Java BigDecimal	JavaBigDecimal.java
BigNumber	Easy	Java BigInteger	JavaBigInteger.java
BigNumber	Easy	Java Primality Test	JavaPrimalityTest.java
Data Structures	Easy	Java 1D Array	Java1DArray.java
Data Structures	Easy	Java 2D Array	Java2DArray.java
Data Structures	Easy	Java List	JavaList.java
Data Structures	Easy	Java Subarray	JavaSubarray.java
Data Structures	Easy	Java Arraylist	JavaArraylist.java

Python

Subdomain	Difficulty	Challenge	Solution
Introduction	Easy	Say "Hello, World!" With Python	SayHelloWorldWithPython.py
Introduction	Easy	Python If-Else	PythonIfElse.py
Introduction	Easy	Arithmetic Operators	ArithmeticOperators.py
Introduction	Easy	Python: Division	PythonDivision.py
Introduction	Easy	Loops	Loops.py
Introduction	Easy	Print Function	PrintFunction.py
Introduction	Medium	Write a function	WriteAFunction.py
Basic Data Types	Easy	Lists	Lists.py
Basic Data Types	Easy	Tuples	Tuples.py
Basic Data Types	Easy	List Comprehensions	ListComprehensions.py
Basic Data Types	Easy	Find the Runner-Up Score!	FindTheRunnerUpScore.py
Basic Data Types	Easy	Nested Lists	NestedLists.py
Basic Data Types	Easy	Finding the percentage	FindingThePercentage.py
Strings	Easy	sWAP cASE	SwapCase.py
Strings	Easy	String Split and Join	StringSplitAndJoin.py
Strings	Easy	What's Your Name?	WhatsYourName.py
Strings	Easy	Mutations	Mutations.py
Strings	Easy	Find a string	FindAString.py
Strings	Easy	String Validators	StringValidators.py
Strings	Easy	Text Alignment	TextAlignment.py
Strings	Easy	Text Wrap	TextWrap.py
Strings	Easy	Designer Door Mat	DesignerDoorMat.py
Strings	Easy	String Formatting	StringFormatting.py
Strings	Easy	Alphabet Rangoli	AlphabetRangoli.py
Strings	Easy	Capitalize!	Capitalize.py
Strings	Medium	The Minion Game	TheMinionGame.py
Strings	Medium	Merge the Tools!	MergeTheTools.py
Sets	Easy	Introduction to Sets	IntroductionToSets.py
Sets	Medium	No Idea!	NoIdea.py
Sets	Easy	Symmetric Difference	SymmetricDifference.py
Sets	Easy	Set .add()	SetAdd.py
Sets	Easy	Set .discard(), .remove() & .pop()	SetDiscardRemovePop.py
Sets	Easy	Set .union() Operation	SetUnion.py
Sets	Easy	Set .intersection() Operation	SetIntersection.py
Sets	Easy	Set .difference() Operation	SetDifference.py
Sets	Easy	Set .symmetric_difference() Operation	SetSymmetricDifference.py
Sets	Easy	Set Mutations	SetMutations.py
Sets	Easy	The Captain's Room	TheCaptiansRoom.py
Sets	Easy	Check Subset	CheckSubset.py
Sets	Easy	Check Strict Superset	CheckStrictSuperset.py
Math	Easy	Polar Coordinates	PolarCoordinates.py
Math	Medium	Find Angle MBC	FindAngleMBC.py
Math	Easy	Mod Divmod	ModDivmod.py
Math	Easy	Power - Mod Power	PowerModPower.py
Math	Easy	Integers Come In All Sizes	IntegersComeInAllSizes.py
Math	Medium	Triangle Quest	TriangleQuest.py
Math	Medium	Triangle Quest 2	TriangleQuest2.py
Itertools	Easy	itertools.product()	itertools_product.py
Itertools	Easy	itertools.permutations()	itertools_permutations.py
Itertools	Easy	itertools.combinations()	itertools_combinations.py
Itertools	Easy	itertools.combinations() with replacement	itertools_combinations_with_replacement.py
Itertools	Medium	compress the string	compress_the_string.py
Itertools	Medium	iterables and iterators	iterables_and_iterators.py
itertools	Hard	maximize it	maximize_it.py

Shell

Subdomain	Difficulty	Challenge	Solution
Bash	Easy	Let's Echo	LetsEcho.sh
Bash	Easy	A Personalized Echo	APersonalizedEcho.sh
Bash	Easy	Looping and Skipping	LoopingAndSkipping.sh
Bash	Easy	Looping with Numbers	LoopingWithNumbers.sh
Bash	Easy	The World of Numbers	TheWorldOfNumbers.sh
Bash	Easy	Comparing Numbers	ComparingNumbers.sh
Bash	Easy	Getting started with conditionals	ComparingNumbers.sh
Bash	Easy	More on Conditionals	MoreOnConditionals.sh
Bash	Medium	Arithmetic Operations	ArithmeticOperations.sh
Bash	Medium	Compute the Average	ComputeTheAverage.sh
Bash	Hard	Functions and Fractals - Recursive Trees - Bash!	FunctionsAndFractalsRecursiveTreesBash.sh
Text Processing	Easy	Cut #1	Cut#1.sh
Text Processing	Easy	Cut #2	Cut#2.sh
Text Processing	Easy	Cut #3	Cut#3.sh
Text Processing	Easy	Cut #4	Cut#4.sh
Text Processing	Easy	Cut #5	Cut#5.sh
Text Processing	Easy	Cut #6	Cut#6.sh
Text Processing	Easy	Cut #7	Cut#7.sh
Text Processing	Easy	Cut #8	Cut#8.sh
Text Processing	Easy	Cut #9	Cut#9.sh
Text Processing	Easy	Head of a Text File #1	HeadOfATextFile#1.sh
Text Processing	Easy	Head of a Text File #2	HeadOfATextFile#2.sh
Text Processing	Easy	Tail of a Text File #1	TailOfATextFile#1.sh
Text Processing	Easy	Tail of a Text File #2	TailOfATextFile#2.sh
Text Processing	Easy	Middle of a Text File	MiddleOfATextFile.sh
Text Processing	Easy	'Tr' Command #1	TrCommand#1.sh
Text Processing	Easy	'Tr' Command #2	TrCommand#2.sh
Text Processing	Easy	'Tr' Command #3	TrCommand#3.sh
Text Processing	Easy	Sort Command #1	SortCommand#1.sh
Text Processing	Easy	Sort Command #2	SortCommand#2.sh
Text Processing	Easy	Sort Command #3	SortCommand#3.sh
Text Processing	Easy	Sort Command #4	SortCommand#4.sh
Text Processing	Easy	Sort Command #5	SortCommand#5.sh
Text Processing	Easy	Sort Command #6	SortCommand#6.sh
Text Processing	Easy	Sort Command #7	SortCommand#7.sh
Text Processing	Easy	'Uniq' Command #1	UniqCommand#1.sh
Text Processing	Easy	'Uniq' Command #2	UniqCommand#2.sh
Text Processing	Easy	'Uniq' Command #3	UniqCommand#3.sh
Text Processing	Easy	'Uniq' Command #4	UniqCommand#4.sh
Text Processing	Medium	Paste - 1	Paste1.sh
Text Processing	Medium	Paste - 2	Paste2.sh
Text Processing	Medium	Paste - 3	Paste3.sh
Text Processing	Medium	Paste - 4	Paste4.sh
Arrays in Bash	Easy	Read in an Array	ReadInAnArray.sh
Arrays in Bash	Easy	Slice an Array	SliceAnArray.sh
Arrays in Bash	Medium	Filter an Array with Patterns	FilterAnArrayWithPatterns.sh
Arrays in Bash	Easy	Concatenate an array with itself	ConcatenateAnArrayWithItself.sh
Arrays in Bash	Easy	Display an element of an array	DisplayAnElementOfAnArray.sh
Arrays in Bash	Easy	Count the number of elements in an Array	CountTheNumberOfElementsInAnArray.sh
Arrays in Bash	Medium	Remove the First Capital Letter from Each Element	RemoveTheFirstCapitalLetterFromEachElement.sh
Arrays in Bash	Hard	Lonely Integer - Bash!	LonelyIntegerBash.sh
Grep Sed Awk	Easy	'Grep' - A	GrepA.sh
Grep Sed Awk	Easy	'Grep' - B	GrepB.sh
Grep Sed Awk	Medium	'Grep' #1	Grep#1.sh
Grep Sed Awk	Medium	'Grep' #2	Grep#2.sh
Grep Sed Awk	Medium	'Grep' #3	Grep#3.sh
Grep Sed Awk	Medium	'Sed' command #1	SedCommand#1.sh
Grep Sed Awk	Medium	'Sed' command #2	SedCommand#2.sh
Grep Sed Awk	Easy	'Sed' command #3	SedCommand#3.sh
Grep Sed Awk	Hard	'Sed' command #4	SedCommand#4.sh
Grep Sed Awk	Hard	'Sed' command #5	SedCommand#5.sh
Grep Sed Awk	Medium	'Awk' - 1	Awk1.sh
Grep Sed Awk	Medium	'Awk' - 2	Awk2.sh
Grep Sed Awk	Medium	'Awk' - 3	Awk3.sh
Grep Sed Awk	Medium	'Awk' - 4	Awk4.sh

TUTORIALS

Javascript

Day	Difficulty	Challenge	Solution
0	Easy	Hello, World!	hello_world.js
0	Easy	Data Types	data_types.js
1	Easy	Arithmetic Operators	arithmetic_operators.js
1	Easy	Functions	functions.js
1	Easy	Let and Const	let_and_const.js
2	Easy	If else	if_else.js
2	Easy	Switch	switch.js
2	Easy	Loops	loops.js
3	Easy	Arrays	arrays.js
3	Easy	Try Catch and Finally	try_catch_and_finally.js
3	Easy	Throw	throw.js
4	Easy	Create a rectangle object	create_a_rectangle_object.js
4	Easy	Count Objects	count_objects.js
4	Easy	Classes	classes.js
5	Easy	Inheritance	inheritance.js
5	Easy	Template literals	template_literals.js
5	Easy	Arrow functions	arrow_functions.js
6	Easy	Bitwise operators	bitwise_operators.js
6	Easy	Javascript dates	javascript_dates.js
7	Easy	Regular expressions I	regular_expressions_1.js
7	Easy	Regular expressions II	regular_expressions_2.js
7	Easy	Regular expressions III	regular_expressions_3.js
8	Easy	Create a button	button.js
8	Easy	Buttons container	buttonsGrid.js
9	Medium	Binary calculator	binaryCalculator.js