我觉得紫题更合适吧...
by x_angelkawaii_x @ 2018-10-25 15:37:32
黄题！！！
by Sugarcube @ 2019-02-02 11:39:38
正解生成函数吧。。。
还要求导推
by TLE自动机 @ 2019-12-19 16:21:35
掉紫考古
by panyf @ 2020-04-05 18:27:52
于是它变紫题了
by Smile_Cindy @ 2020-07-19 10:12:50
~~考古~~
by mediocre_ @ 2022-11-29 18:21:30