
Youareanassistantdirectorinanewmusicalplay.Theplayconsistsofnmusicalparts,eachpartmustbeperformedbyexactlyoneactor.Afterthecastingthedirectorchosemactorswhocantakepartintheplay.Yourtaskistoassignthepartstoactors.However,thereareseverallimitations.First,eachactorhasacertainvoicerangeandtherearesomepartsthathecannotsing.Formally,therearetwointegersforeachactor,cianddi(ci ≤ di) —thepitcho...

PetyaandGenaloveplayingtabletennis.Asinglematchisplayedaccordingtothefollowingrules:amatchconsistsofmultiplesets,eachsetconsistsofmultipleserves.Eachserveiswonbyoneoftheplayers,thisplayerscoresonepoint.Assoonasoneoftheplayersscorestpoints,hewinstheset;thenthenextsetstartsandscoresofbothplayersarebeingsetto0.Assoonasoneoftheplayerswinsthetotalofssets,hewinsthematchandthematchisover.Heresandt...

Youaregivenann × mrectangulartableconsistingoflowercaseEnglishletters.Inoneoperationyoucancompletelyremoveonecolumnfromthetable.Theremainingpartsarecombinedforminganewtable.Forexample,afterremovingthesecondcolumnfromthetable[crayon-693ebad0a2403938937486/]weobtainthetable:[crayon-693ebad0a240a561631621/]Atableiscalledgoodifitsrowsareorderedfromtoptobottomlexicographically,i.e.eachrowislex...
近期评论