迷宫有一个入口，一个出口。一个人从入口走进迷宫，目标是找到出口。阴影部分和迷宫的外框为墙，每一步走一格，每格有四个可走的方向，探索顺序为：南、东、北、西。(The labyrinth has an entrance, an exit. A man walks into the labyrinth from the entrance, and the goal is to find the exit. The outer frame of the shadow and the maze is a