08 2019 档案

Aho-Corasick algorithm
摘要：Aho Corasick algorithm Let there be a set of strings with the total length $m$ (sum of all lengths). The Aho Corasick algorithm constructs a data stru 阅读全文
posted @ 2019-08-20 20:22 SuuTTT 阅读(268) 评论(0) 推荐(0)
Finding repetitions
摘要：<! ?title Finding repetitions Finding repetitions Given a string $s$ of length $n$. A repetition is two occurrences of a string in a row. In other wor 阅读全文
posted @ 2019-08-20 20:21 SuuTTT 阅读(186) 评论(0) 推荐(0)
Suffix Automaton
摘要：Suffix Automaton A suffix automaton is a powerful data structure that allows solving many string related problems. For example, you can search for all 阅读全文
posted @ 2019-08-20 20:20 SuuTTT 阅读(272) 评论(0) 推荐(0)
Z-function and its calculation
摘要：Z function and its calculation Suppose we are given a string $s$ of length $n$. The Z function for this string is an array of length $n$ where the $i$ 阅读全文
posted @ 2019-08-20 20:19 SuuTTT 阅读(234) 评论(0) 推荐(0)
Prefix function. Knuth–Morris–Pratt algorithm
摘要：Prefix function. Knuth–Morris–Pratt algorithm Prefix function definition You are given a string $s$ of length $n$. The prefix function for this string 阅读全文
posted @ 2019-08-20 20:18 SuuTTT 阅读(181) 评论(0) 推荐(0)
Suffix Array
摘要：<! ?title Suffix Array Suffix Array Definition Let $s$ be a string of length $n$. The $i$ th suffix of $s$ is the substring $s[i \ldots n 1]$. A suffi 阅读全文
posted @ 2019-08-20 20:16 SuuTTT 阅读(609) 评论(0) 推荐(0)
知识点 - 计算几何基础
摘要：知识点 计算几何基础 讲义 点 我们把点 $\mathbf r$ 看成从 $\mathbf 0$ 到 $\mathbf r$的向量 $\vec{\mathbf r}$ 点乘 1. $\mathbf a \cdot \mathbf b = \mathbf b \cdot \mathbf a$ 2. $ 阅读全文
posted @ 2019-08-17 21:12 SuuTTT 阅读(231) 评论(0) 推荐(0)
知识点 - 树状数组
摘要：知识点 树状数组 解决问题类型： 单点更新，前缀查询，很简单地拓展到2维 复杂度即代码： python 例题 "UVA 12086 Potentiometers" "LOJ 1112 Curious Robin Hood" "LOJ 1266 Points in Rectangle" "Codech 阅读全文
posted @ 2019-08-16 21:25 SuuTTT 阅读(132) 评论(0) 推荐(0)
知识点 - 线段树 权值 树套树 二维 可持续
摘要：知识点 线段树 权值 树套树 二维 可持续 解决问题类型： 区间rmq即其他符合结合律的运算，支持区间更新。 想法题 1. 【二分】找第k个0：结点维护0的个数cnt[rt]，然后在树上队cnt二分。 2. 【二分】找第k大（权值线段树）：这个问题可以排序或 . 考虑线段树的做法，我们先将n个数离散 阅读全文
posted @ 2019-08-16 21:13 SuuTTT 阅读(139) 评论(0) 推荐(0)
Operations on polynomials and series
摘要：Operations on polynomials and series In this article we will cover common operations that you will probably have to do if you deal with polynomials. B 阅读全文
posted @ 2019-08-14 16:39 SuuTTT 阅读(187) 评论(0) 推荐(0)
AtCoder 137 F 插值 差分 或构造
摘要：AtCoder 137 F 插值求系数 想法题 题意： "AtCoder 137 F" 已知：$f(x)$在p个点的值：$f(i) \equiv a_i \pmod p$ $(0 \leq i \leq p 1)$ 求：$f(x) = b_{p 1} x^{p 1} + b_{p 2} x^{p 2 阅读全文
posted @ 2019-08-13 22:24 SuuTTT 阅读(317) 评论(0) 推荐(0)
Burnside's lemma / Pólya enumeration theorem
摘要：Burnside's lemma / Pólya enumeration theorem Burnside's lemma Burnside's lemma was formulated and proven by Burnside in 1897, but historically it was 阅读全文
posted @ 2019-08-08 22:21 SuuTTT 阅读(217) 评论(0) 推荐(0)
The Inclusion-Exclusion Principle
摘要：The Inclusion Exclusion Principle The inclusion exclusion principle is an important combinatorial way to compute the size of a set or the probability 阅读全文
posted @ 2019-08-08 22:05 SuuTTT 阅读(491) 评论(0) 推荐(0)