https://gss0.baidu.com/-Po3dSag_xI4khGko9WTAnF6hhy/zhidao/wh%3D600%2C800/sign=abfc9e30b4315c6043c063e9bd81e72b/c8ea15ce36d3d539fd023de63287e950352ab0d3.jpg
是选择题最后一题吗?cp最短距离是2!