My HackerRank Solutions

Solutions for HackerRank problems written in Java

Java

Introduction

Topic	Challange	Solution
Introduction	Welcome to Java!	WelcomeToJava.java
Introduction	Stdin and Stdout I	StdinAndStdoutI.java
Introduction	If-Else	IfAndElse.java
Introduction	Stdin and Stdout II	StdinAndStdoutII.java
Introduction	Output Formatting	OutputFormatting.java
Introduction	Loops I	LoopsI.java
Introduction	Loops II	LoopsII.java
Introduction	Datatypes	Datatypes.java
Introduction	End-of-file	EndOfFile.java
Introduction	Static Initializer Block	StaticInitializerBlock.java
Introduction	Int to String	IntToString.java
Introduction	Date and Time	DateAndTime.java
Introduction	Currency Formatter	CurrencyFormatter.java

Strings

Topic	Challange	Solution
Strings	Strings Introduction	StringsIntroduction.java
Strings	Substring	Substring.java
Strings	Substring Comparisons	SubstringComparisons.java
Strings	String Reverse	StringReverse.java
Strings	Anagrams	Anagrams.java
Strings	String Tokens	StringTokens.java
Strings	Pattern Syntax Checker	PatternSyntaxChecker.java
Strings	Regex	JavaRegex.java
Strings	Regex 2 - Duplicate Words	JavaRegex2_DuplicateWords.java
Strings	Valid Username Regular Expression	ValidUsernameRegularExpression.java
Strings	Tag Content Extractor	TagContentExtractor.java

BigNumber

Topic	Challange	Solution
BigNumber	Java BigInteger	JavaBigInteger.java
BigNumber	Java BigDecimal	JavaBigDecimal.java
BigNumber	Java Primality Test	JavaPrimalityTest.java

30 Days of Code Challenges

Some class name changes for conflicting issue. Ex. "Person" classname changed to "Person1" or "Person2", "Node" classname changed to "Node1" or "Node2" etc.

Day	Challange	Solution
Day 0	Hello, World.	Day0_HelloWorld.java
Day 1	Data Types	Day1_DataTypes.java
Day 2	Operators	Day2_Operators.java
Day 3	Intro to Conditional Statements	Day3_IntroToConditionalStatements.java
Day 4	Class vs. Instance	Day4_ClassVSInstance.java
Day 5	Loops	Day5_Loops.java
Day 6	Let's Review	Day6_LetsReview.java
Day 7	Arrays	Day7_Arrays.java
Day 8	Dictionaries and Maps	Day8_DictionariesAndMaps.java
Day 9	Recursion	Day9_Recursion.java
Day 10	Binary Numbers	Day10_BinaryNumbers.java
Day 11	2D Arrays	Day11_2DArrays.java
Day 12	Inheritance	Day12_Inheritance.java
Day 13	Abstract Classes	Day13_AbstractClasses.java
Day 14	Scope	Day14_Scope.java
Day 15	Linked List	Day15_LinkedList.java
Day 16	Exceptions - String to Integer	Day16_ExceptionsStringToInteger.java
Day 17	More Exceptions	Day17_MoreExceptions.java
Day 18	Queues and Stacks	Day18_QueuesAndStacks.java
Day 19	Interfaces	Day19_Interfaces.java
Day 20	Sorting	Day20_Sorting.java
Day 21	Generics	Day21_Generics.java
Day 22	Binary Search Trees	Day22_BinarySearchTrees.java
Day 23	BST Level-Order Traversal	Day23_BSTLevelOrderTraversal.java
Day 24	More Linked Lists	Day24_MoreLinkedLists.java
Day 25	Running Time and Complexity	Day25_RunningTimeAndComplexity.java
Day 26	Nested Logic	Day26_NestedLogic.java
Day 27	Testing	Day27_Testing.java
Day 28	RegEx, Patterns, and Intro to Databases	Day28_RegExPatternsAndIntroToDatabases.java
Day 29	Bitwise AND	Day29_BitwiseAND.java