此程序是求迷宫中从入口 到出口的所有路径。在搜索中还要建立一个堆栈，将所走过的路记录下来，后退时将退出的路从堆栈中弹出。这样保证了最终保存的是迷宫的一条出路。栈底元素为入口坐标，栈顶元素为迷宫的出口坐标-This procedure is for the maze from the entrance to the export of all paths. In the search but also the establishment of a stack, the road to record, back when the road will withdraw from the pop-up from the stack. This guarantees that the ultimate preservation of the labyrinth of a way out. Stack at the end of the element coordinates for the entrance, Top-element for the maze of export coordinates