（1）用随机函数建立一个迷宫，给定出入口

（2）设计一个模拟走迷宫的程序寻找通路，存在则将其显示在屏幕上

（3）找出其中途径最短的通路

-(1) create a maze with a random function, given the import and export (2) design procedures for a simulated maze to find access, there will be the display on the screen (3) to identify ways in which the shortest path