2325: [ZJOI2011]道馆之战 (树链剖分+线段树)

https://www.zhihu.com/question/43785539
https://www.zhihu.com/question/43785539?eweh=67oo
https://www.zhihu.com/question/43785539/answer/9723952
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https://www.zhihu.com/question/43784163
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https://www.zhihu.com/question/43785256/answer/9723839
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https://www.zhihu.com/question/43786639
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