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已经很久没有写博客了，好像写博客这件事并不能坚持下来一样。 从暑假的8月至今，这两个月的时间里面状态可以说是持续下降，从前面的多校到之后的网络赛，可以说是一场不如一场，打的越来越差。再加上外界的一些压力，期间也在不停的反思和纠结，但是一直找不到问题出在哪里。现在写这篇博文的时候其实依旧不太清楚... 阅读全文
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主席树（Chair Tree），一个神奇的数据结构。 实质上是函数式的线段树，或者可持久化的线段树。可持久化这个还比较好理解，Persistent Data Structures，看一下以上这篇文章就差不多明白为啥叫可持久化的的了。但是恕我太弱，对函数式编程实在理解不了多少，所以为啥是函数式的... 阅读全文
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Problem DescriptionCoco has a tree, whose vertices are conveniently labeled by 1,2,…,n.There are m chain on the tree, Each chain has a certain weight.... 阅读全文
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DescriptionFarmer John has purchased a lush new rectangular pasture composed ofMbyN(1 ≤M≤ 12; 1 ≤N≤ 12) square parcels. He wants to grow some yummy co... 阅读全文
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DescriptionWhile visiting a traveling fun fair you suddenly have an urge to break the high score in the Whac-a-Mole game. The goal of the Whac-a-Mole ... 阅读全文
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DescriptionThe NASA Space Center, Houston, is less than 200 miles from San Antonio, Texas (the site of the ACM Finals this year). This is the place wh... 阅读全文
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DescriptionSeiji Hayashi had been a professor of the Nisshinkan Samurai School in the domain of Aizu for a long time in the 18th century. In order to ... 阅读全文
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DescriptionIn Korea, the naughtiness of the cheonggaeguri, a small frog, is legendary. This is a well-deserved reputation, because the frogs jump thro... 阅读全文
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DescriptionKeeping track of all the cows can be a tricky task so Farmer John has installed a system to automate it. He has installed on each cow an el... 阅读全文
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Description将一个８*８的棋盘进行如下分割：将原棋盘割下一块矩形棋盘并使剩下部分也是矩形，再将剩下的部分继续如此分割，这样割了(n-1)次后，连同最后剩下的矩形棋盘共有n块矩形棋盘。(每次切割都只能沿着棋盘格子的边进行)原棋盘上每一格有一个分值，一块矩形棋盘的总分为其所含各格分值之和。现在... 阅读全文