DescriptionThereisanappletreeoutsideofkaka'shouse.Everyautumn,alotofappleswillgrowinthetree.Kakalikesappleverymuch,sohehasbeencarefullynurturingthebigappletree.ThetreehasNforkswhichareconnectedbybranches.Kakanumberstheforksby1toNandtherootisalwaysnumberedby1.Appleswillgrowontheforksandtwoapplewon'tgrowonthesamefork.kakawantstoknowhowmanyapplesarethereinasub-tree,forhisstudyoftheproduceabi...
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