Description: There is a river, the left side of a stone (A zone) has numbered on 1,2,3,4, ..., n of n only frogs, the river has k-lotus leaf (C zone), also a Shihtunkeng h ( D), the right side there is a stone (B zone), as shown in Figure 3-1. n frogs to cross the river (from the left bank of the right bank of the Shihtunkeng Shihtunkeng A to B)
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