【BZOJ 4662】Snow

相关链接

题目传送门:http://www.lydsy.com/JudgeOnline/problem.php?id=4662
神犇题解:http://www.cnblogs.com/ccz181078/p/6291464.html

解题报告

想了两个小时没有想出来
一看题解,居然是姿势优雅的暴力

考虑最开始的区间一定是长这样的

删掉正中间的那个区间之后就变成了这样

发现蓝色框住的区间右端点相同了,绿色框住的区间左端点相同了!
于是两个椭圆框住的区间以后就可以进行区间维护了,不用再一个一个改
复杂度的话,因为暴力修改会进行 $ O(n)$ 次,所以单次修改操作的均摊复杂度为 $ O(\log n)$

具体实现上的话,用线段树支持区间操作
再用一个并查集搞一搞,右端点/左端点相同了就并一起
修改就暴力再并查集上爬一爬就好啦!

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