摘要：
The title of this problem is familiar,isn't it?yeah,if you had took part in the "Rookie Cup" competition,you must have seem this title.If you haven't 阅读全文
摘要：
Problem Description 不知道大家有没有玩过一个叫做 九连环 的玩具，如下图所示。 如果你不了解九连环，那玄黄就带你领略九连环的奥妙： 九连环是我国传统的民间智力玩具，玩具上面有九个连环套在杆上，目标就是通过一定的方式将九个连环从杆上全部取下来。 玩法是这样的： 1、对每个环，有2种 阅读全文