几个有趣的问题，提供了相应的C代码，可执行，像爱因斯坦问题，九宫图问题-Several interesting questions, to provide the corresponding C code, executable, such as Einstein issue, Jiugong graph problems

重排九宫问题，实现从输入到目标九宫图的解的过程-Rearrangement jiugong problem, solving and output the input to the target jiugong diagram of the solution