Aho - Corasick string matching algorithm 俗称:多模式匹配算法,它是对 Knuth - Morris - pratt algorithm (单模式匹配算法) 形成多模式匹配算法的一种改进,如果我们用单模式匹配算法实现多模式匹配算法,假如模式串有 M 个 , 则需要重复调用 M 次单模式匹配算法 : 举个很简单的例子,假如我现在有一本特殊的字典,字典中的词汇就是所有的模式串,然后给你一篇文章(全英文),让你查一下这篇文章中有多少个词汇在字典中可以查得到:(为…

Binary String Matching 时间限制:3000 ms  |  内存限制:65535 KB 难度:3   描述 Given two strings A and B, whose alphabet consist only ‘0’ and ‘1’. Your task is only to tell how many times does A appear as a substring of B? For example, the text string B is ‘1001110…

hihocoder #1059 :String Matching Content Length 时间限制:10000ms 单点时限:1000ms 内存限制:256MB 描述 We define the matching contents in the strings of strA and strB as common substrings of the two strings. There are two additional restrictions on the common substr…

5-Binary String Matching 内存限制:64MB 时间限制:3000ms 特判: No通过数:232 提交数:458 难度:3 题目描述: Given two strings A and B, whose alphabet consist only ‘0’ and ‘1’. Your task is only to tell how many times does A appear as a substring of B? For example, the text stri…

[CF954I]Yet Another String Matching Problem(FFT) 题面 给定两个字符串\(S,T\) 求\(S\)所有长度为\(|T|\)的子串与\(T\)的距离 两个等长的串的距离定义为最少的,将某一个字符全部视作另外一个字符的次数. \(|T|<=|S|<=10^6\),字符集大小为\(6\) 题解 考虑如何快速计算两个串的答案,从左向右扫一遍,如果对应位置上有两个字符不同,检查在并查集中是否属于同一个集合,如果不属于则答案加一,同时合并两个集合.(这个就是…

Binary String Matching 时间限制:3000 ms  |  内存限制:65535 KB 难度:3   描述 Given two strings A and B, whose alphabet consist only ‘0’ and ‘1’. Your task is only to tell how many times does A appear as a substring of B? For example, the text string B is ‘1001110…

Binary String Matching 时间限制:3000 ms  |  内存限制:65535 KB 难度:3   描述 Given two strings A and B, whose alphabet consist only ‘0’ and ‘1’. Your task is only to tell how many times does A appear as a substring of B? For example, the text string B is ‘1001110…

背景 在做实际工作中,最简单也最常用的一种自然语言处理方法就是关键词匹配,例如我们要对n条文本进行过滤,那本身是一个过滤词表的,通常进行过滤的代码如下 for (String document : documents) { for (String filterWord : filterWords) { if (document.contains(filterWord)) { //process ... } } } 如果文本的数量是n,过滤词的数量是k,那么复杂度为O(nk):如果关键词的数量较多…

Problem Description String matching is a common type of problem in computer science. One string matching problem is as following: Given a string s[0…len−1], please calculate the length of the longest common prefix of s[i…len−1] and s[0…len−1] for eac…

问题 B: Binary String Matching 时间限制: 3 Sec  内存限制: 128 MB提交: 4  解决: 2[提交][状态][讨论版] 题目描述 Given two strings A and B, whose alphabet consist only ‘0’ and ‘1’. Your task is only to tell how many times does A appear as a substring of B? For example, the text…