集训队作业poi188道解题报告poi18smi

1、POI18smi解有一个城市 n 个路口m 条道路每条道路都有干POI18smi解有一个城市 n 个路口m 条道路每条道路都有干净和不干净两种状态。n 100000, m dfs dfs void结点now，dfs深度为ifnowstackpcnt+1=apcnt=void结点now，dfs深度为ifnowstackpcnt+1=apcnt=now; while (1)top-=if(sttop=now)a+pcnt+1=now; st+top=now; instnow = 1;fork=lnow;k;k=nextk)ifvisk=visk1lnow=dumk,if(topd)fori=1;i

2、1)NIE=Memorylimit:256TheByteotianWasteManagementCompany(BWMC)hasdrasticallyraisedpriceofgarbagecollectiony.ThiscausedsomeofthecitizenstopayingforcollectingtheirgarbageandstartingofMemorylimit:256TheByteotianWasteManagementCompany(BWMC)hasdrasticallyraisedpriceofgarbagecollectiony.Thiscausedsomeofthe

3、citizenstopayingforcollectingtheirgarbageandstartingofheConsequently,manystreetsofByteburgareliterallyburiedunderThestreetsystemofByteburgconsistsersections,someofwhichdirectlyconnectedwithbidirectionalstreets.Notwostreetsconnectthepairersections.SomeofthestreetsarelitteredwhileothersareThemayorofBy

4、teburg,Byteasar,hasdecidedonanunprecedentedactionto persuadethecitizenstopayforwastecollection.Namely,hedecidedtoclean onlysomeofthestreets-preciselythose tthemajorityofpeoplelivingpaidarbagecollection.Thetthemajorityofpeoplelivingonnotpayforwastecollection,ontheotherhand,willthusremainlittered-orif

5、iscalledfor-elitteredbythegarbagecollectedfromotherByteasarhasalreadypreparedacitymapwiththestreetstobecleanedandremainelitteredmarkedon.y,theBWMCcannot comprehend his mastlan.Theyare,however,quitecapableof carrying out simple instructions.Asinglesuchinstructionconsistsindrivingthegarbagetruckalonga

6、tstartsonanersection,goesalonganystreetsofchoice,andontheverytitstartedon.However,canbevisitedatmostonceonasingleroute,exceptfortheoneitstartsendswith-thegarbagetruckobviouslyappearstwicetone.Thecleansalitteredstreetitridesalong,butontheotherhanditdumpsthewaste on the clean streets along its route,

7、making them littered.Byteasarwondersifitsibletoexecutehisplanbyinganumberaforementionedrouteinstructions.HelphimoutbywritingatdeterminesasetofsuchroutesortitisThereareegers,separatedbyasinglelineof),denotingstandard(,numberersectionsandthenumberofstreetsinByteburg,ersectionsarenumbered.Thelinessives

8、treets,oneperline.Eachofthoselinesholds).Suchseparatedbysingle: , (,quadrupletareconnectedlsifthestreetiscurrentlylittered( meansclean,Thereareegers,separatedbyasinglelineof),denotingstandard(,numberersectionsandthenumberofstreetsinByteburg,ersectionsarenumbered.Thelinessivestreets,oneperline.Eachof

9、thoselinesholds).Suchseparatedbysingle: , (,quadrupletareconnectedlsifthestreetiscurrentlylittered( meansclean,littered),lsifthestreetshouldbelitteredaccordingtoByteasarsYoumaytifthereexistsasetofroutestocarryoutByteasarsthenthereisoneinwhichthetotalnumberoftthegarbagefollowsdoesnot.estsworth60%ofth

10、esitadditionallyt.IfthereisnosetofroutesforthegarbagetrucktoexecuteByteasarsthenthewordNIE(noinPolish)shouldbeedouttoandonly t doeslineofthestandardoutput.Otherwise,anarbitrarysetofroutes execute Byteasars plan and has the truck move along no morenotalshouldbeedout.Thenlineshouldtheofheset.Thelinesshoulddescriberoutes,oneperline.-thlineshouldstartequaltothenumberofhe -throute.Afteranumbersofersectionsalongtherouteshouldseparatedbysingle.Thecleanstreetsaredrawnthinhefigure,whereasthelittered taretobecleanarestreetsaredrawnthickline.Thedashedline,whiletaretobelitteredaredrawnFort