相关链接
题目传送门:http://www.lydsy.com/JudgeOnline/problem.php?id=2821
神犇题解Ⅰ:http://blog.csdn.net/PoPoQQQ/article/details/40372067
神犇题解Ⅱ:http://www.cnblogs.com/JSZX11556/p/5031198.html
解题报告
这货最开始想用高级数据结构来做
想了半个小时,一点思路都没有 QwQ
好吧,看完题解发现全™写的是分块
不过这题的姿势又有一点不一样
一般的分块是:
大块直接扫一遍,顺便统计答案
这题的分块得预处理块与块之间的关系
$ f[i][j]$ 表示第i个大块到第j个大块的答案
似乎这样的复杂度才是对的
时间复杂度: $ O({n^{1.5}}\log (n))$
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