Designadatastructurethatsupportsthefollowingtwooperations:voidaddWord(word)boolsearch(word)search(word)cansearchaliteralwordoraregularexpressionstringcontaining...

Giventwoarrays,writeafunctiontocomputetheirintersection.Example:Given nums1 = [1,2,2,1], nums2 = [2,2],return [2].Note:Eachel...

Youaregivenanintegerarraysortedinascendingorder(maycontainduplicates),youneedtosplitthemintoseveralsubsequences,whereeachsubsequencesconsistofatleast3consecutiv...

Givenasortedarray,twointegers k and x,findthe k closestelementsto x inthearray.Theresultshouldalsobesortedinascendingorder.If...

  Initially,thereisaRobotatposition(0,0).Givenasequenceofitsmoves,judgeifthisrobotmakesacircle,whichmeansitmovesbackto theoriginalplace.Themovese...

Givenalistofnonnegativeintegers,arrangethemsuchthattheyformthelargestnumber.Forexample,given [3,30,34,5,9],thelargestformednumberis 9534330.Note:There...

Startfrominteger1,removeanyintegerthatcontains9suchas9,19,29...Sonow,youwillhaveanewintegersequence:1,2,3,4,5,6,7,8,10,11,...Givenapositiveinteger n,younee...

Givenanarrayofintegers,1≤a[i]≤ n (n =sizeofarray),someelementsappear twice andothersappear once.Findalltheelementsthatappear ...

Givenaninteger,writeanalgorithmtoconvertittohexadecimal.Fornegativeinteger, two’scomplement methodisused.Note:Alllettersinhexadecimal(a-f)mustbeinlowe...

Givenscoresof N athletes,findtheirrelativeranksandthepeoplewiththetopthreehighestscores,whowillbeawardedmedals:"GoldMedal","SilverMedal"and"BronzeMeda...

Givenastringwhichcontainsonlylowercaseletters,removeduplicateletterssothateveryletterappearonceandonlyonce.Youmustmakesureyourresultisthesmallestinlexicographic...

Givenanintegerarraywithnoduplicates.Amaximumtreebuildingonthisarrayisdefinedasfollow:Therootisthemaximumnumberinthearray.Theleftsubtreeisthemaximumtreeconstruct...

GivenaBinarySearchTreeandatargetnumber,returntrueifthereexisttwoelementsintheBSTsuchthattheirsumisequaltothegiventarget.Example1:Input:5/36/247Target=9Output:Tr...

Givenanarray A (indexstartsat 1)consistingofNintegers:A1,A2,...,AN andaninteger B.Theinteger B denotesthatfromanyplace(suppos...

Givenanon-negativeinteger num,repeatedlyaddallitsdigitsuntiltheresulthasonlyonedigit.Forexample:Given num=38,theprocessislike: 3+8=11, 1+1=2...