https://blog.csdn.net/nkliuorz/article/details/78276520
https://blog.csdn.net/xc19952007/article/details/48437037
https://blog.csdn.net/qq_35649707/article/details/78834636
https://blog.csdn.net/dylan_frank/article/details/70947993
https://blog.csdn.net/ADjky/article/details/72637490
https://blog.csdn.net/f2935552941/article/details/79966277
https://blog.csdn.net/Icefox_zhx/article/details/79453056

+结合单调队列 https://blog.csdn.net/huanghongxun/article/details/51252536
https://blog.csdn.net/w_yqts/article/details/78947056
% http://www.cnblogs.com/cax1165/p/6070875.html
https://zhidao.baidu.com/question/1927462563971247907.html

入门推荐 LOJ 分块九讲 https://loj.ac/problem/6278
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