There was a stone cross in the middle of the village.
村子中间有一块十字形石碑。
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。
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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