随便输入一个入口坐标和出口坐标，求出一条从入口到出口的路径，如果不存在或者存在要做出相应的判断，存在时将路径用坐标的形式表现出来。-Just enter an entrance coordinates and export coordinates, find a path from the inlet to the outlet does not exist or exists to make the appropriate judgment, there the path in the for