Data Structures and Algorithms

NewUpdate:AlgnotesupportsOFFLINEnow!

AlgnoteletsdevelopersorCSstudentseasilyreviewdatastructuresandalgorithmsfromtheory,implementationtocodingproblems.Ifyouareaprogrammerlookingforyourfirstprogrammingjobandpreparingforcodinginterviews,orastudentwhoispreparingforexamsaboutdatastructuresandalgorithms,thisappcouldbearightfitforyou.AllthealgorithmsanddatastructuresareimplementedinJava.Therefore,ifyouwanttousetheAlgnotetolearncoding,pleasemakesureyouarecomfortablewithJava.

CurrentlyAlgnotehasthefollowingsections:
-Array
-String
-LinkedList
-Stack
-Queue
-HashTable
-Tree
-Graph
-Searching
-Sorting
-Recursion
-DynamicProgramming
-Math
-BitManipulation

Eachsectioncontainsthetheorynotestohelpuserstounderstandtheconceptsandseveralcodingproblemstoimprovetheirfamiliaritytothealgorithmsordatastructures.MostofthecodingproblemsareselectedfromLeetcodeandimplementedbythedeveloper.Someproblemshavemultiplesolutionsandcomparetheposandcronsofdifferentalgorithms.

AlthoughcurrentlyAlgnotefocusesonalgorithmsanddatastructuresbutweplantoextendtheapptohavemoreothercontent,frombasiclanguagetutorialstohighlevelarchitectureknowledges.

Somewordsfromthedeveloperofthisapp:

NotethatallthesenotesweredonebymewithsomereferencestosometextbooksoronlinecodingquestionsIdidbefore.Theyarenotasaccurateasatextbook.Asthisisaveryearlyrelease,therearedefinitelysomeissuesinthenotesandIamtryingmybesttofindthemandcorrectthem.Iwillkeepoptimizingthecontentandfunctionalitytomakeitbettereveryday.Ifyoufindanyissuewhenyouareusingit,itwillbemuchappreciatedifyoucouldsendamessagetomarcyliew@gmail.com.

CurrentlyallthecontentofthisappwaspreparedwhenIjustgraduatedfromuniversityandwaspreparingforcodinginterviews.AtthattimeIwasprettyconfidentthatIcouldgetagoodjobasIhaddonemanyprojectsinschoolandIwasverygoodatbuildingwebandmobileapplications.

However,thingsdidnotgoasIexpected.Duringtheinterviews,theinterviewersaskedmetowritecodestosolveproblemsonthewhiteboard.Manytimes,Igotstuckontheproblemsandcouldnotfigureoutasinglesolution.EvenwhenIcompletedasolutionandfelthappy,theinterviewersoftenimmediatelypointedouttheproblemofmycode.Notefficientenough,usetoomuchmemoryspace,ordidnotconsidertheboundarysituations.Ifeltdisappointedtomyself.

Fortunately,Igotaprettygoodofferfromacompanyandstartedmycareerasawebdeveloper.ButevennowIstillfeelhardtocompletethesealgorithmsquestions.

Iknowpreparingforcodinginterviewsisnoteasy,butitisnotthathard.Itisjustaprocessthatweneedtogothroughtobecomegooddevelopers.

Theseareallthepurposesofthisapp.Iuseiteverydaytoreviewmyknowledgesonalgorithmsanddatastructures.Ihopeitcouldnotonlyhelpmyself,butalsohelpmoredeveloperswhoarefightingfortheircareers.