有一条河，左边一个石墩（A区）上有编号为1，2，3，4，…，n的n只青蛙，河中有k个荷叶（C区），还有h个石墩（D区），右边有一个石墩（B区），如图3-1所示。n只青蛙要过河（从左岸石墩A到右岸石墩B）-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)