刚学OI学树剖
orzorzorz
by Rainbow_qwq @ 2020-02-13 15:12:01
然鹅树剖模板是树的统计
by Aho_Corasick @ 2020-02-13 15:13:47
话说这题好像比树的统计难诶
by Aho_Corasick @ 2020-02-13 15:15:15
emmm清理废帖翻到了这个
点进去一看不对啊
明明是20分怎么会说成了30呢
by 洛倾然 @ 2020-03-23 14:20:46