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frog
- 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 Shi