Useraintahasapermutationp1, p2, ..., pn.AstheNewYeariscoming,hewantstomakehispermutationasprettyaspossible.Permutationa1, a2, ..., anisprettierthanpermutationb1, b2, ..., bn,ifandonlyifthereexistsanintegerk(1 ≤ k ≤ n)wherea1 = b1, a2 = b2, ..., ak - 1 = bk - 1andak < bkallholds.Asknown,permutationpissosensitivethatitcouldbeonlymodifiedbyswappingtwodistinctele...
Youareanassistantdirectorinanewmusicalplay.Theplayconsistsofnmusicalparts,eachpartmustbeperformedbyexactlyoneactor.Afterthecastingthedirectorchosemactorswhocantakepartintheplay.Yourtaskistoassignthepartstoactors.However,thereareseverallimitations.First,eachactorhasacertainvoicerangeandtherearesomepartsthathecannotsing.Formally,therearetwointegersforeachactor,cianddi(ci ≤ di) —thepitcho...
Youaregivenann × mrectangulartableconsistingoflowercaseEnglishletters.Inoneoperationyoucancompletelyremoveonecolumnfromthetable.Theremainingpartsarecombinedforminganewtable.Forexample,afterremovingthesecondcolumnfromthetable[crayon-676d52d7bbcce647631587/]weobtainthetable:[crayon-676d52d7bbcda280387300/]Atableiscalledgoodifitsrowsareorderedfromtoptobottomlexicographically,i.e.eachrowislex...
Description给定一棵n个点的带权树,求树上最长的异或和路径InputTheinputcontainsseveraltestcases.Thefirstlineofeachtestcasecontainsanintegern(1<=n<=100000),Thefollowingn-1lineseachcontainsthreeintegersu(0<=u<n),v(0<=v<n),w(0<=w<2^31),whichmeansthereisanedgebetweennodeuandvoflengthw.OutputForeachtestcaseoutputthexor-lengthofthexor-longestpath.SampleInput4123234246Samp...
Malekhasrecentlyfoundatreasuremap.Whilehewaslookingforatreasurehefoundalockeddoor.Therewasastringswrittenonthedoorconsistingofcharacters'(',')'and'#'.Belowtherewasamanualonhowtoopenthedoor.AfterspendingalongtimeMalekmanagedtodecodethemanualandfoundoutthatthegoalistoreplaceeach'#'withoneormore')'characterssothatthefinalstringbecomesbeautiful.Belowtherewasalsowrittenthatastringiscalledbeautif...
Vanyawantstopassnexamsandgettheacademicscholarship.Hewillgetthescholarshipiftheaveragegrademarkforalltheexamsisatleastavg.Theexamgradecannotexceedr.Vanyahaspassedtheexamsandgotgradeaiforthei-thexam.Toincreasethegradeforthei-thexamby1point,Vanyamustwritebiessays.Hecanraisetheexamgrademultipletimes.WhatistheminimumnumberofessaysthatVanyaneedstowritetogetscholarship?InputThefirstlinecontai...
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