#include<string.h> /*naive string-matching algorithm,T为原始字符串,P为需要匹配的字符串*/ void naiveMatch(char *T,char *P) { int lenT,lenP,i,j; lenT=strlen(T); lenP=strlen(P); if(lenT<lenP)/*需要匹配的字符串比原始字符串还要长出错*/ { perror("input error"); return ; } for(...
可参考:http://jakeboxer.com/blog/2009/12/13/the-knuth-morris-pratt-algorithm-in-my-own-words/(需FQ) 理解过后,编码实现的关键在于next(i)数组的构建,直接求next(i)不好求,因此,在上述参考中,则求前缀和后缀的最大公共长度(模式串已匹配字串长度减去最大公共长度就是模式串要右滑长度),然后其实通过...
通用匹配算法 Naive String-Matching Algorithm 通用匹配算法一般是最愚蠢最直接的方式,通过循环作移位比较来判断字符串是否匹配 比如一个字符串P, 去匹配字符串T。执行T.length - P.length次检查,每次从T.substring(index, index + P.length)开始逐字符和P比较。 n=T.lengthm=P.lengthfors=0ton-m:ifP[1.....
参考 https://en.wikipedia.org/wiki/Knuth%E2%80%93Morris%E2%80%93Pratt_algorithm https://www.geeksforgeeks.org/kmp-algorithm-for-pattern-searching/
KMP算法全称是Knuth-Morris-Pratt Algorithm(克努特—莫里斯—普拉特算法)实际上就是优化后的模式匹配算法。这个算法是由D.E.Knuth、J.H.Morris、V.R.Pratt这三位大佬提出。 Donald·E·Knuth大佬帅照附上 James H. Morris大佬帅照附上 Vaughan·R·Pratt大佬帅照附上 ...
The Knuth-Morris-Pratt Algorithm 输入 正文串T[1,n]和模式串W[1,m] 输出 匹配结果match[1,n] 发现者 D.E.Knuth等 时间复杂度 O(m+n) 折叠编辑本段基本思想 设主串(下文中我们称作T)为:a ba c a a b a c a ba c a b a a b b ...
下面举个例子说明下Sunday算法。假定现在要在文本串"substring searching algorithm"中查找模式串"search"。 1. 刚开始时,把模式串与文本串左边对齐: substring searching algorithm search ^ 2. 结果发现在第2个字符处发现不匹配,不匹配时关注文本串中参加匹配的最末位字符的下一位字符,即标粗的字符 i,因为模式串...
A fast string searching algorithm[J]. Communications of the ACM,1977,10: 762-772. 之前我们刚开始说坏字符的时候,是不是有可能会出现负值的情况,即往左移动的情况,所以我们为了解决这个问题,我们可以分别计算好后缀和坏字符往后滑动的位数(好后缀不为 0 的情况),然后取两个数中最大的,作为模式串往后滑动...
Today I'd like to talk about an algorithm that I believe should be in any Software Engineer's toolkit. That is, the KMP algorithm named after its three inventors: Knuth-Morris-Pratt. The algorithm was designed to solve efficiently a very common problem. That is the problem of fin...
KMP Algorithm Resource for Beginners By codechef123, history, 2 years ago, KMP pattern searching is an advanced algorithm & it is hard to explain it in simple terms. I stumbled on to this resource recently. I think it is a good starting point for people wanting to understand the basic...