谁都清楚，要在这样一个漂浮在水上的城市里不迷路简直是不可能的，它就像一个迷宫，会让你分不清东南西北。 与其如此，还不如就跟着感觉走。

As everyone knows, to be in that floating city is to be forever lost and disoriented, as if in a labyrinth.

youdao

给定的迷宫不包含边界，但迷宫四周都是墙壁。

The given maze doesn't contain border (like the red rectangle in the example pictures), but you should assume the border of the maze are all walls.

youdao

迷宫至少包含两个空地，并且迷宫的长度和宽度不超过30。

The maze contains at least 2 empty Spaces, and the length and width of the maze won't exceed 30.

youdao

I don't know if you know the story, but Labyrinth Books is independent, it's not a chain, and independent bookstores are trying-struggling--to survive.

不知道你们是否了解,"迷宫书店"家是独立书店 而非连锁书店,对于独立书店来说,生存下去非常艰难

耶鲁公开课 - 金融市场课程节选