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WhatwasAnudeepNekkanti'sCompetitiveProgrammingstrategytobecome35thinGlobalranking,injust67months?HesaidinthisHowdidAnudeepNekkantibecomesogoodatcompetitiveprogramming?,hegottoknowaboutonlinejudgeinJanandbyAugust,hewas35thinGlobalranking.Iwanttoknowwhatwashispreparationstrategy?

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WantAnswers 910 Share

UjjwalAyyangarEditBiographyMakeAnonymous

Writeyouranswer,oranswerlater

WhatIdid?

Solvedabout300problemsonSPOJinthisorderSphereOnlineJudge(SPOJ)

Result?

BecameverygoodwithC++andSTL

GotintroducedtomostCompetitiveprogrammingKEYWORDS(likeDP,maxflow,sets,hashing,etc)

LearnedStandardProblemsandAlgorithms

Indentingcode

Fasttyping:P

How?Beforestartingprogramming,Isearchedabouthowandwheretostart,manysaid"LearnanAlgorithm,implementit,solveproblemsrelatedtoit".Ididnotdoitthatway,Ifyouknowwhatalgorithmtouseyougenerallythinkinthatdirectionandleaveaboutcorrectness.Ididthemproblembyproblem,easytohard,Ispent14hoursonaproblem.Igettheidea,Icodeit,GetitAccepted.(Iusedtotestalot,IalwayswantedtogetAConfirstgo)

Idonotgettheidea,Isavethatproblemandtryitafteramonthagain.IfIstilldonotgetthem,thensearchforhints.IfitclearlyneededsomealgorithmwhichIneverusedthenIfirstsmile(?IcouldnotonlybecauseIdidnotknewthealgorithm:P)andthenstartreadingaboutthatalgorithm.TopCoderhadtutorialsofalmostallcommonalgorithms.ThisiswhereIdidaBIGMISTAKE.Inevercaredaboutcorrectnessorruntimeanalysisproof,Ialwayslearnedhowtosolvetheproblemusingthatalgorithm,Ihardlylearnedabouthowthealgorithmworks.Ifeelbadaboutitnow,butthatishowIsolvedthoseproblemsthen.Isolvedmaxflow,convexhull,etc.,problemsusingdescribedalgorithmsbutIdidnotUNDERSTANDthosealgorithmsthen.

Mistake:OnceIstartedtakingpartincontests,Icompletelystoppedpractice.

35thinGlobalRanking

AnudeepNekkanti,""keyhatesmethemost..3kupvotesbyPradeepGeorgeMathias,SachinMalhotra,AnweshNayak,(more)

AddQuestionSearch Home Write Notifications Ujjwal

Updated23Dec,2013.57,704views.AskedtoanswerbyAnonymous,AamirKhan,PradeepGeorgeMathias,(more).

DownVote Comments 15+ 49

CodeCheflongcontestsarecomparativelyeasy(Whichisgood,Youcanlearnalot),yougetalotoftimetothinkaboutaproblem,searchforresources.YouonlyneedKEYWORDStosearchforsimilarproblems.

Igavealotoftimeforeachcontest.Iusedtosolve4easyproblemsin23days,thentake56daysforother3problems.

CodeChefratingsystemisnotgood.ItishighlyVolatile.

IfIamtostartprogrammingnow,Iwoulddoitthisway

1. Solve200mostsolvedproblemsonSPOJ,Problembyproblem.In2months.(Thiswillteachallstandardproblems,algorithmsandimplementationskills)

2. SolveproblemsfromCodeChefandCodeForcesfor2months.(Thiswillteachvariations,wecanreadotherssolutionsandlearnbetterways.Skipeasyproblems)

3. SolveproblemsfromTopCoderfor2months.(ThiswillteachDynamicProgramming.Div1500p)

4. CheckpastACMICPCRegional'sProblems(Greatqualityproblems)

IfIamtolearnanewAlgorithmnow,Iwoulddoitthisway

1. Readitfromatleast34differentsources.

2. Understandcorrectnessproofandruntimeanalysis.(Thisisveryveryimportant,youwillknowitonlywhenyoudealwithnonstandardandhardproblems)

3. Questionyourselfoneverystepforcorrectness.Trytotweaktheimplementation.

4. Checkotherimplementations.

FinalNoteThoughtIbecamegoodinsolvingproblemsandhadgoodrank.Ilater(Feb13)realizedthatIlearneditthewrongway.Ithenstartedlearningagain.Ilearnedallthealgorithmsagainthistimegaveimportancetothealgorithmitself,correctnessproofandmathematicalanalysis.Itisworththetime.

ProblemfromDecemberlongcontest,Trytosolveitwithsuffixarrays.YoucanonlyifyouunderstandsuffixarraysandLCPcompletely.

IwasabletosolveanotsoobviousmediumlevelMaxFlowproblematACMKGPOnsiteonlybecauseIcompletelyunderstoodhowthealgorithmworks.Itwasat4hour25minutesIgot5thproblemaccepted,thenIreadthisproblemandgotitaccepted4minutesbeforeend.Learningthealgorithmhelped.Dot.

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ShilpiSingh14votes(show)SomethingIhavebeenlookingforages.Organisedandprecise.Thanksforsharingthis.

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SunnyShah2votes(show)Whataboutdatastructures?Didyouspendtimeonthemseparatelyordidyoulearnthemthroughcompetitiveprogramming?

Reply... Downvote Report20Jun,2014Upvote Share

VishwanathDalvi2votes(show)Brilliant..gotsomeinspirationfromyou..atwhatageyoustartedthis?I'm24,workingandlearningaswell..wanttogetbetterinprogrammingskillsstill.

Reply... Downvote Report22Dec,2013Upvote Share

Addacomment...

codechef.com

2AnswersCollapsed(Why?)

AnudeepNekkanti4votes(show)19.

Reply... Downvote Report23Dec,2013Upvote Share

RahulJaingreatgoing!

Reply... Downvote Report22Dec,2013Upvote Share

SudeeptoDuttaHeyAnudeep,youseemedtobeusingc++asyourmainprogramminglanguage.Canyoupleasetellmewhydidyouchoseitandhowdidyouleanedtoprogramwithit??Pleasedosharethebooks/websitesthatyouused.

Reply... Downvote Report8Jun,2014Upvote Share

PavanKumarDittakavi:MostlikelybecauseC++basedsolutio...

SwapnilBhargavaLoveandRespectforyoudude

Reply... Downvote Report14May,2014Upvote Share

SpandanPathak#RESPECTbuddy.

Reply... Downvote Report22Dec,2013Upvote Share

AshwinMenonWhatdoyoumeanby'correctness'?Correctnessasinwhythealgorithmworks(correctnessofthealgorithm)?Orcorrectnessasinwhetherareductionofaproblemononeofthesesitesreducescorrectlytothealgorithm(correctnessofthereduction)?(Orboth?)

Reply... Downvote Report5Mar,2014Upvote Share

SriHarshaBolisettiExcellentanswer!!

Reply... Downvote Report24Oct,2014Upvote Share

UmmalarajuRameshNiceonetoshare..dude!!!thankzz

Reply... Downvote Report1Jan,2014Upvote Share

AnkammaraoBattulawhenyousayMistake:OnceIstartedtakingpartincontests,Icompletelystoppedpractice.whatdoyoumeanbypractice,isn'tparticipatingincontestsalsopractice??

Reply... Downvote Report12Jul,2014Upvote Share

AnudeepNekkanti:Iusedtotakepartinlongcontests....

SivaSaiThanksalot!forsharingthisinfo.Iambeginnerforcompetitiveprogramming,justnowIhaveregisteredinSPOJ.Iwilltrytosolve200problemsinonemonth

Reply... Downvote Report29Aug,2014Upvote Share

PathSukeshIjoinedtheclgthisyearandwaslookingforawaytodevelopmyself.thankyouannayaforexplaininghowtoproceedforthenextfouryears:)

Reply... Downvote Report9Nov,2014Upvote Share

ShupornoChoudhuryHowtodotheruntimeanalysisofanycode?Imeanhowtoknowthetime(inseconds)thatthecodetakestorun?

Reply... Downvote Report8FebUpvote Share

KrishnaKowshik1votebyTaraShankarChakrabortyAnudeepNekkantiWhatifi'mbadatMath?Anysuggestions?

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KaushikWavhal:AnudeepNekkanti:Howmuchofthesep...

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