What you need to know as a new writer

As a brand new writer, we often start out with the highest of ambitions. Dreams of being recognized for our hard efforts. Speaking as someone who has been in your shoes, I thought you should know…

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CF1264C Beautiful Mirrors with queries

checkpoint 的期望是可以从后往前依次倒退的。

发现一个 checkpoint 的贡献是一个一次函数的形式,用线段树维护一下即可。

听说还可以期望转概率,这样就没有我这么麻烦了。

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