README.md

This repository contains efficient hackerrank solutions for most of the hackerrank challenges including video tutorials. If you are looking for anyone of these things -

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• 30 DAYS OF CODE

• JAVA

• ALGORITHMS

• CRACKING THE CODING INTERVIEW

• DATA STRUCTURES

• GENERAL PROGRAMMING

• IMPLEMENTATION

• TOP 10 LEARNING RESOURCES

  Coding environment used- Windows 8.1, Eclipse Oxygen, JAVA 8

30 DAYS OF CODE

Day Challenge Solution Video Explaination 0 Hello, World Day0HelloWorld.java

1 Data Types Day1DataTypes.java

2 Operators Day2Operators.java

3 Intro to Conditional Statements Day3IntroToConditionalStatements.java

4 Class vs. Instance Day4ClassVsInstance.java

5 Loops Day5Loops.java

6 Let's Review Day6LetsReview.java

7 Arrays Day7Arrays.java

8 Dictionaries and Maps Day8DictionariesAndMaps.java

9 Recursion Day9Recursion.java

10 Binary Numbers Day10BinaryNumbers.java

11 2D Arrays Day112DArrays.java

12 Inheritance Student.java

13 Abstract Classes MyBook.java

14 Scope Day14Scope.java

15 Linked List Day15LinkedList.java

16 Exceptions - String to Integer Day16ExceptionsStringToInteger.java

17 MoreExceptions Day17MoreExceptions.java

18 QueuesAndStacks Day18QueuesAndStacks.java

19 Interfaces Day19Interfaces.java

20 Sorting Day20Sorting.java

21 Generics Day21Generics.java

22 BinarySearchTrees Day22BinarySearchTrees.java

23 BSTLevelOrderTraversal Day23BSTLevelOrderTraversal.java

24 MoreLinkedLists Day24MoreLinkedLists.java

25 RunningTimeAndComplexity Day25RunningTimeAndComplexity.java

26 Nested Logic Day26NestedLogic.java

27 Day 27: Testing Day27Testing.java

28 RegEx,Patterns,and Intro to Databases Day28RegExPatternsAndIntroToDatabases.java

29 Bitwise AND Day29BitwiseAND.java

JAVA

Subdomain Challenge Solution Video Explaination Introduction Welcome to Java! WelcomeToJava.java

Introduction Java Stdin and Stdout I JavaStdinAndStdoutI.java

Introduction Java If-Else JavaIfElse.java

Introduction Java Stdin and Stdout II JavaStdinAndStdoutII.java

Introduction Java Output Formatting JavaOutputFormatting.java

Introduction Java Loops I JavaLoopsI.java

Introduction Java Loops II JavaLoopsII.java

Introduction Java Datatypes JavaDatatypes.java

Introduction Java End-of-file JavaEndOfFile.java

Introduction Java Static Initializer Block JavaStaticInitializerBlock.java

Introduction Java Int to String JavaIntToString.java

Introduction Java Date and Time JavaDateAndTime.java

Introduction Java Currency Formatter JavaCurrencyFormatter.java

Strings Java Strings Introduction JavaStringsIntroduction.java

Strings Java Substring JavaSubstring.java

Strings Java Substring Comparisons JavaSubstringComparisons.java

Strings Java String Reverse JavaStringReverse.java

Strings Java Anagrams JavaAnagrams.java

Strings Java String Tokens JavaStringTokens.java

Strings Pattern Syntax Checker PatternSyntaxChecker.java

Strings Valid Username Regular Expression ValidUsernameRegularExpression.java

Strings Tag Content Extractor TagContentExtractor.java

Strings Java Regex JavaRegex.java

Strings Java Regex 2 - Duplicate Words JavaRegex2DuplicateWords.java

BigInteger Java BigInteger JavaBigInteger.java

BigInteger Java BigDecimal JavaBigDecimal.java

BigInteger Java Primality Test JavaPrimalityTest.java

Data Structures Java 1D Array Java1DArray.java

Data Structures Java 2D Array Java2DArray.java

Data Structures Java Subarray JavaSubarray.java

Data Structures Java Arraylist JavaArraylist.java

Data Structures Java Map JavaMap.java

Data Structures Java Hashset JavaHashset.java

Data Structures Java Comparator JavaComparator.java

Data Structures Java Sort JavaSort.java

Data Structures Java List JavaList.java

Data Structures Java Generics JavaGenerics.java

Data Structures Java Stack JavaStack.java

Data Structures Java Dequeue JavaDequeue.java

Data Structures Java BitSet JavaBitSet.java

Data Structures Java Priority Queue JavaPriorityQueue.java

Data Structures Java 1D Array (Part 2) Java1DArrayPart2.java

Object Oriented Programming Java Inheritance I JavaInheritanceI.java

Object Oriented Programming Java Inheritance II JavaInheritanceII.java

Object Oriented Programming Java Abstract Class JavaAbstractClass.java

Object Oriented Programming Java Interface JavaInterface.java

Object Oriented Programming Java Method Overriding JavaMethodOverriding.java

Object Oriented Programming Java Method Overriding 2(Super Keyword) JavaMethodOverriding2SuperKeyword.java

Object Oriented Programming Java Instanceof keyword JavaInstanceofkeyword.java

Object Oriented Programming Java Iterator JavaIterator.java

Exception Handling Java Exception Handling (Try-catch) JavaExceptionHandlingTryCatch.java

Exception Handling Java Exception Handling JavaExceptionHandling.java

Advanced Java Varargs - Simple Addition JavaVarargsSimpleAddition.java

Advanced Java Reflection - Attributes JavaReflectionAttributes.java

Advanced Can You Access? CanYouAccess.java

Advanced Java Factory Pattern JavaFactoryPattern.java

Advanced Java Singleton Pattern JavaSingletonPattern.java

Advanced Covariant Return Types CovariantReturnTypes.java

Advanced Prime Checker PrimeChecker.java

Advanced Java Annotations JavaAnnotations.java

Advanced Java Lambda Expressions JavaLambdaExpressions.java

Advanced Java MD5 JavaMD5.java

Advanced Java SHA-256 JavaSHA256.java

Advanced Java Visitor Pattern JavaVisitorPattern.java

ALGORITHMS

Subdomain Challenge Solution Video Explaination Sorting Quicksort 1 - Partition Quicksort1Partition.java

Sorting Marc's Cakewalk MarcsCakewalk.java

Sorting Minimum Absolute Difference in an Array MinimumAbsoluteDifferenceInAnArray.java

Sorting Luck Balance LuckBalance.java

Sorting Climbing the Leaderboard ClimbingTheLeaderboard.java Tutorial Sorting Big Sorting BigSorting.java

Sorting Insertion Sort - Part 1 InsertionSortPart1.java

Sorting Insertion Sort - Part 2 InsertionSortPart2.java

Sorting Correctness and the Loop Invariant CorrectnessAndTheLoopInvariant.java

Sorting Running Time of Algorithms RunningTimeOfAlgorithms.java

Sorting Counting Sort 1 CountingSort1.java

Sorting Counting Sort 2 CountingSort2.java

Sorting Counting Sort 3 CountingSort3.java

Sorting Intro to Tutorial Challenges IntroToTutorialChallenges.java

Sorting Find the Median FindTheMedian.java

Sorting Closest Numbers ClosestNumbers.java

Sorting Mark and Toys MarkAndToys.java

Sorting Jim and the Orders JimAndTheOrders.java

search Lonely Integer LonelyInteger.java Tutorial search Bit Manipulation: Lonely Integer BitManipulationLonelyInteger.java Tutorial search Ice Cream Parlor IceCreamParlor.java

search HashTables: IceCreamParlor HashTablesIceCreamParlor.java

search Minimum Loss MinimumLoss.java

search Sherlock and Array SherlockAndArray.java Tutorial Greedy Algorithms Marc's Cakewalk MarcsCakewalk.java

Greedy Algorithms Luck Balance LuckBalance.java

Greedy Algorithms Equal Stacks EqualStacks.java Tutorial Greedy Algorithms Mark and Toys MarkAndToys.java

Greedy Algorithms Jim and the Orders JimAndTheOrders.java

Greedy Algorithms Priyanka and Toys PriyankaAndToys.java

Graph Theory Kruskal (MST): Really Special Subtree KruskalMSTReallySpecialSubtree.java

Graph Theory Breadth First Search: Shortest Reach BreadthFirstSearchShortestReach.java

Graph Theory Prim's (MST) : Special Subtree PrimsMSTSpecialSubtree.java

Strings Super Reduced String SuperReducedString.java

Strings Caesar Cipher CaesarCipher.java

Strings Mars Exploration MarsExploration.java

Strings CamelCase CamelCase.java

Strings Gemstones Gemstones.java

Strings The Love-Letter Mystery TheLoveLetterMystery.java

Strings Pangrams Pangrams.java

Strings Alternating Characters AlternatingCharacters.java

Strings Beautiful Binary String BeautifulBinaryString.java

Strings Big Sorting BigSorting.java

Strings Anagram Anagram.java

Strings Two Strings TwoStrings.java

Strings Funny String FunnyString.java

Strings String Construction StringConstruction.java

Strings Strings: Making Anagrams StringsMakingAnagrams.java

Strings Making Anagrams MakingAnagrams.java

Strings Caesar Cipher: Encryption CaesarCipherEncryption.java

Strings Game of Thrones - I GameOfThronesI.java

Strings Sherlock and the Valid String SherlockAndTheValidString.java

Recursion Recursive Digit Sum RecursiveDigitSum.java

Dynamic Programming Fibonacci Modified FibonacciModified.java

Dynamic Programming The Maximum Subarray TheMaximumSubarray.java

Bit Manipulation Lonely Integer LonelyInteger.java Tutorial Bit Manipulation Bit Manipulation: Lonely Integer BitManipulationLonelyInteger.java Tutorial Bit Manipulation Sum vs XOR SumvsXOR.java

Bit Manipulation Maximizing XOR MaximizingXOR.java

Bit Manipulation Sansa and XOR SansaAndXOR.java

Constructive Algorithms New Year Chaos NewYearChaos.java Tutorial

CRACKING THE CODING INTERVIEW

Topic Challenge Solution Video Explaination Techniques / Concepts Time Complexity: Primality Primality.java

Techniques / Concepts Recursion: Fibonacci Numbers FibonacciNumber.java

Techniques / Concepts Recursion: Davis' Staircase DavisStaircase.java

Techniques / Concepts Bit Manipulation: Lonely Integer LonelyInteger.java Tutorial Techniques / Concepts DP: Coin Change DPCoinChange.java

Data Structures Arrays: Left Rotation LeftRotation.java Tutorial Data Structures Strings: Making Anagrams MakingAnagrams.java

Data Structures Hash Tables: Ransom Note HashTablesRansomNote.java

Data Structures Linked Lists: Detect a Cycle DetectACycle.java

Data Structures Stacks: Balanced Brackets BalancedBrackets.java

Data Structures Trees: Is This a Binary Search Tree? TreesIsThisABinarySearchTree.java

Data Structures Heaps: Find the Running Median HeapsFindTheRunningMedian.java

Data Structures Tries: Contacts TriesContacts.java

Algorithms Sorting: Bubble Sort SortingBubbleSort.java

Algorithms Sorting: Comparator SortingComparator.java

Algorithms Hash Tables: Ice Cream Parlor HashTablesIceCreamParlor.java

Algorithms BFS: Shortest Reach in a Graph BFSShortestReachInAGraph.java

DATA STRUCTURES

Subdomain Challenge Solution Video Explaination Arrays Arrays - DS ArraysDS.java Tutorial Arrays 2D Array - DS TwoDArrayDS.java

Arrays Dynamic Array DynamicArray.java Tutorial Arrays Left Rotation LeftRotation.java Tutorial Arrays Big Sorting BigSorting.java

Arrays Sparse Arrays SparseArrays.java Tutorial Arrays Array Manipulation ArrayManipulation.java Tutorial Stacks Maximum Element MaximumElement.java Tutorial Stacks Balanced Brackets BalancedBrackets.java

Stacks Equal Stacks EqualStacks.java Tutorial Stacks Largest Rectangle LargestRectangle.java

Stacks Simple Text Editor SimpleTextEditor.java

Trees Preorder Traversal PreorderTraversal.java

Trees Inorder Traversal InorderTraversal.java

Trees Postorder Traversal PostorderTraversal.java

Trees Height of a Binary Tree HeightOfABinaryTree.java

Trees Level Order Traversal LevelOrderTraversal.java

Trees Huffman Decoding HuffmanDecoding.java

Trees Top View TopView.java

Linked List Print the Elements of a Linked List PrintTheElementsOfALinkedList.java

Linked List Insert a node at the head of a linked list InsertANodeAtHeadOfAList.java

Linked List Insert a Node at the Tail of a Linked List InsertANodeAtTheTailOfALinkedList.java

Linked List Insert a node at a specific position in a linked list InsertANodeAtASpecificPositionInALinkedList.java

Linked List Delete a Node DeleteANode.java

Linked List Print in Reverse PrintInReverse.java

Linked List Reverse a linked list ReverseALinkedList.java

Linked List Compare two linked lists CompareTwoLinkedLists.java

Linked List Merge two sorted linked lists MergeTwoSortedLinkedLists.java

Linked List Get Node Value GetNodeValue.java

Linked List Delete duplicate-value nodes from a sorted linked list DeleteDuplicateValueNodesFromASortedLinkedList.java

Linked List Cycle Detection CycleDetection.java

Linked List Find Merge Point of Two Lists FindMergePointOfTwoLists.java

Linked List Inserting a Node Into a Sorted Doubly Linked List InsertingANodeIntoASortedDoublyLinkedList.java

Linked List Reverse a doubly linked list ReverseADoublyLinkedList.java

Tries Contacts Contacts.java

Tries No Prefix Set NoPrefixSet.java

Queues Queue using Two Stacks QueueUsingTwoStacks.java

Heaps QHEAP1 QHEAP1.java

Heaps Jesse and Cookies JesseAndCookies.java

Heaps Find the Running Median FindTheRunningMedian.java

Disjoint Set Merging Communities MergingCommunities.java

Disjoint Set Components in a graph ComponentsInAGraph.java

GENERAL PROGRAMMING

Subdomain Challenge Solution Video Explaination Basic Programming Solve Me First SolveMeFirst.java Tutorial Basic Programming Staircase Staircase.java Tutorial Basic Programming Plus Minus PlusMinus.java Tutorial Basic Programming Diagonal Difference DiagonalDifference.java Tutorial Basic Programming A Very Big Sum AVeryBigSum.java Tutorial Basic Programming Simple Array Sum SimpleArraySum.java Tutorial Basic Programming Compare the Triplets CompareTheTriplets.java Tutorial Basic Programming Divisible Sum Pairs DivisibleSumPairs.java

Basic Programming Kangaroo Kangaroo.java Tutorial Basic Programming Drawing Book DrawingBook.java Tutorial Basic Programming Birthday Cake Candles BirthdayCakeCandles.java Tutorial Basic Programming Bon Appétit BonAppétit.java

Basic Programming Sock Merchant SockMerchant.java Tutorial Basic Programming Apple and Orange AppleAndOrange.java

Basic Programming Between Two Sets BetweenTwoSets.java

Basic Programming Mini-Max Sum MiniMaxSum.java Tutorial Basic Programming Grading Students GradingStudents.java

Basic Programming Breaking the Records BreakingTheRecords.java

Basic Programming Migratory Birds MigratoryBirds.java

Basic Programming Birthday Chocolate BirthdayChocolate.java

Basic Programming Time Conversion TimeConversion.java Tutorial Basic Programming Library Fine LibraryFine.java

Basic Programming Save the Prisoner! SaveThePrisoner.java Tutorial Basic Programming Jumping on the Clouds: Revisited JumpingOnTheCloudsRevisited.java

Basic Programming Counting Valleys CountingValleys.java Tutorial Basic Programming Viral Advertising ViralAdvertising.java

Basic Programming Beautiful Days at the Movies BeautifulDaysAtTheMovies.java

Basic Programming Electronics Shop ElectronicsShop.java

Basic Programming Cats and a Mouse CatsAndAMouse.java Tutorial Basic Programming Day of the Programmer DayOfTheProgrammer.java

Basic Programming The Hurdle Race TheHurdleRace.java

Basic Programming Utopian Tree UtopianTree.java

Basic Programming Service Lane ServiceLane.java

Basic Programming Circular Array Rotation CircularArrayRotation.java

Basic Programming Sherlock and Squares SherlockAndSquares.java

Basic Programming Angry Professor AngryProfessor.java Tutorial Basic Programming Extra Long Factorials ExtraLongFactorials.java

Basic Programming Minimum Distances MinimumDistances.java Tutorial Basic Programming Non-Divisible Subset NonDivisibleSubset.java

Basic Programming Beautiful Triplets BeautifulTriplets.java

Basic Programming Jumping on the Clouds JumpingOnTheClouds.java

Basic Programming Equalize the Array EqualizeTheArray.java Tutorial Basic Programming Designer PDF Viewer DesignerPDFViewer.java

Basic Programming Forming a Magic Square FormingAMagicSquare.java

Basic Programming Repeated String RepeatedString.java

Basic Programming Bitwise AND BitwiseAND.java

Basic Programming Divisible Pairs Sum DivisiblePairsSum.java

Basic Programming Append and Delete AppendAndDelete.java

Basic Programming Picking Numbers PickingNumbers.java Tutorial Basic Programming Climbing the Leaderboard ClimbingTheLeaderboard.java Tutorial Basic Programming Sequence Equation SequenceEquation.java

Basic Programming Find Digits FindDigits.java Tutorial Basic Programming Chocolate Feast ChocolateFeast.java

Basic Programming Cut the sticks CutTheSticks.java

Basic Programming ACM ICPC Team ACMICPCTeam.java Tutorial Basic Programming Taum and B'day TaumAndBday.java

Basic Programming The Time in Words TheTimeInWords.java

Basic Programming Flatland Space Stations FlatlandSpaceStations.java

Basic Programming Lisa's Workbook LisasWorkbook.java

Basic Programming Fair Rations FairRations.java

Basic Programming Manasa and Stones ManasaAndStones.java

Basic Programming Cavity Map CavityMap.java

Basic Programming The Grid Search TheGridSearch.java

Basic Programming Happy Ladybugs HappyLadybugs.java

Basic Programming Strange Counter StrangeCounter.java

Basic Programming Consecutive 1's in Binary Numbers Consecutive1sInBinaryNumbers.java Tutorial Basic Programming Bigger is Greater BiggerIsGreater.java Tutorial

IMPLEMENTATION

Subdomain Challenge Solution Video Explaination Brute Force Day of the Programmer DayOfTheProgrammer.java

Brute Force Pangrams Pangrams.java

Brute Force Climbing the Leaderboard ClimbingTheLeaderboard.java Tutorial Brute Force Strings: Making Anagrams StringsMakingAnagrams.java

Brute Force Encryption Encryption.java

Brute Force Making Anagrams MakingAnagrams.java

TOP 10 LEARNING RESOURCES

1) Cracking the Coding Interview

2) Algorithms Hardcover

3) The Algorithm Design Manual

4) Data Structures & Algorithms in Java

5) Data Structures and Algorithms Made Easy

6) Grokking Algorithms

7) Dynamic Programming for Coding Interviews

8) Introduction to Algorithms

9) Elements of Programming Interviews in Java

10) Programming Interviews Exposed

DISCLAIMER: This above mentioned resources have affiliate links, which means if you buy one of the product from my links, I’ll receive a small commission. This helps support the channel and allows us to continue to add more tutorial. Thank you for the support!

*NOTE: All above shared learning resources are best of my knowledge as I have personally read all except one Introduction to Algorithms.