题链：
https://www.luogu.org/problemnew/show/P2664
题解：
扫描线，线段树维护区间覆盖
https://www.luogu.org/blog/ZJ75211/solution-p2664（直接看这里吧）
标签：div 线段树 show www solution blank 题解 ble 维护
题链：
https://www.luogu.org/problemnew/show/P2664
题解：
扫描线，线段树维护区间覆盖
https://www.luogu.org/blog/ZJ75211/solution-p2664（直接看这里吧）
标签：div 线段树 show www solution blank 题解 ble 维护
原文地址：https://www.cnblogs.com/zj75211/p/8541679.html
