Remove Exactly Two ( [Codeforces Round 1000 (Div. 2)](httpsmirror.codeforces.comcontest2063) )
RemoveExactlyTwo(CodeforcesRound1000(Div.2))Recently,LittleJohngotatreefromhisaunttodecoratehishouse.Butasitseems,justonetreeisnotenoughtodecoratetheentirehouse.LittleJohnhasanidea.Maybehecanremoveafe