Given a list of stones' positions (in units) in sorted ascending order, determine if the frog is able to cross the river by landing on the last stone.
给定一列石头的位置(以单元数计),顺序递增,判断青蛙是否可以跳到最后一块石头上。
There was a stone cross in the middle of the village.
村子中间有一块十字形石碑。
The passage (which was) placed with stone railings in cross shaped was called "chess-board street".
石栏和过道交叉成十字形,过道叫做棋盘街。
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