曾经是有的，实际上是poi的图片加载不出来了x
by _mxi @ 2018-11-01 15:27:26
@[子谦。](/space/show?uid=34530)
可以先左转 https://loj.ac/problem/2164
by Planet6174 @ 2018-11-01 15:58:13
@[chen_zhe](/space/show?uid=8457)
by Planet6174 @ 2018-11-01 15:58:20
@[MxI_box](/space/show?uid=82211) @[Planet6174](/space/show?uid=29762) 谢谢两位大佬
by 子谦。 @ 2018-11-01 16:25:37
@[studyingfather](/user/22030)
by _•́へ•́╬_ @ 2020-02-28 21:30:51