{ti points} Let G = (HE) he a cermected, undirected graph. [In this ceurse wefellmu the usual
cenverltierl that, unless indicated UH'IEI'WiSE, an undirected graph dues net have loops er multiple
edgesjflsusualn = |V| andm= |E|. Art urticaria-tier: paint of G is a vertex whese remeval discerlnects G.
Aswesawinclass,iiyeurunDFSmG,then{hecauseGiscermected}theeuterreutinewill
havetemalte enl}r one call Exp]ere{G,r} fer some vertex r, after whim all verlices will he visited.
The“tree”edgesereatedinfliispreeessfermasparmingteeTefGreetedatr. {a} Prm'efltatrisanarliculafienpeintifandenlyifithasatleasttwechildrenin'l". {b} Lettraér.TheancestersefeareflreveflicesenthesimplepathinTiremeterfinelusive.
Praperancestersextfludes.Thedescendantsefearethesewhidthaveuasanancester. Prm'efliatuisanarlictflatienpeintiianderflyiffliereisachildseiein T.sud1thatne
descendantefshasahackedgetnapreperancesterefu. {c} Let lew [u] = min{pre[w} : El descendant 1.: iii tr such that (u, w] is a back edge}. Shaw hm
te cmnpute all lmflu} in time DEM}. {:1} Show haw te cempute all arliculaticrrl points in time DEM}.
Runtimes in this problem are in the ward model (baelc arithmetic etc. is in unit time}.
