
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-69148742ebbc4346961586/]weobtainthetable:[crayon-69148742ebbcd241538547/]Atableiscalledgoodifitsrowsareorderedfromtoptobottomlexicographically,i.e.eachrowislex...
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