POJ 1703 Find them, Catch them 并查集 (关系问题 判断是否在一个集合)
DescriptionThepoliceofficeinTaduCitydecidestosayendstothechaos,aslaunchactionstorootuptheTWOgangsinthecity,GangDragonandGangSnake.However,thepolicefirstneedstoidentifywhichgangacriminalbelongsto.Thepr