Link: Computer Algorithms: Rabin-Karp String Searching 为了避免挨个字符对文本和模式串进行比较,我们可以尝试一次性判断两者是否相等. 因此,我们需要一个好的哈希函数(hash function).通过哈希函数,我们可以算出模式串的哈希值,然后将它和文本中的子串的哈希值进行比较. 这里有一个问题,我们必须保证该哈希函数能够对一个较长的字符串返回较短的哈希值.然而,我们又不能指望较长的模式串能得到较短的哈希值. 但除此之外,这个新方法在速度上应该…

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…

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…