摘要: With $Dsu \ on \ tree$ we can answer queries of this type: How many vertices in the subtree of vertex $v$ has some property in $O (n \log n)$ time (fo 阅读全文
posted @ 2019-01-10 09:38 Colythme 阅读(187) 评论(0) 推荐(0) 编辑