九方块找路径问题，采用广度遍历，找寻回到原来位置的路径，如果遍历超过六层，则说明找不到，否则，输出其路径。-Nine squares to find path problem, USES the breadth traversal, looking back to the path of the original position, if more than six layer traversal, then find, otherwise, the output path.