相关链接
题目传送门：http://www.lydsy.com/JudgeOnline/problem.php?id=4552
神犇题解：http://maghsk.github.io/2016/05/05/20160506-bzoj-4552-tjoi2016heoi2016/
解题报告
之前在BC上看到过这道题：http://bestcoder.hdu.edu.cn/contests/contest_showproblem.php?cid=680&pid=1004
这就不知道是谁抄谁的了
考虑直接做的话，似乎没法用任何数据结构来维护的样子
于是二分最后的答案 $ p$ ，将小于 $ p$ 的置为0，大于 $ p$ 的搞成1
这样的话，排序操作就变成了区间查询和区间赋值
于是搞一个线段树什么的就可以啦！
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