题目链接 题意:每个文本串的出现次数 分析:入门题,注意重复的关键字算不同的关键字,还有之前加过的清零.   新模板,加上last跑快一倍 #include <bits/stdc++.h> struct AC { static const int NODE = 10000 * 50 + 5; static const int SIZE = 26; int ch[NODE][SIZE], fail[NODE], last[NODE]; int end[NODE]; int sz; void cl…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2222 思路分析:该问题为多模式匹配问题,使用AC自动机解决:需要注意的问题是如何统计该待查询的字符串包含的关键字: 假设待查找的字符串为str[0..n],则str[i…j]可能为某一个关键字:假设当前正在匹配字符str[k],则以str[i..k]为关键字的所有可能 可能的关键字的最后一个字符为str[k],使用fail指针进行跳转并判断以str[k]结尾的该结点是否为关键字最后一个结点,重复进行…

http://acm.hdu.edu.cn/showproblem.php?pid=2222 第一道 AC自动机.....trie树的建立 和 AC自动机的查询,,可作模版... 解题思路:AC的应用...直接模版.. #include <iostream> #include<cstring> using namespace std; struct point { struct point *final; ]; int count; point(){ final =NULL; co…

Keywords Search Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 59360    Accepted Submission(s): 19520 Problem Description In the modern time, Search engine came into the life of everybody lik…

Keywords Search Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others) Total Submission(s): 44687    Accepted Submission(s): 14103 Problem Description In the modern time, Search engine came into the life of everybody li…

Aho-Corasick automaton,该算法在1975年产生于贝尔实验室,是著名的多模式匹配算法之一. KMP算法很好的解决了单模式匹配问题,如果有了字典树的基础,我们可以完美的结合二者解决多模式匹配问题. 在KMP算法中,我们预先根据待匹配串自身的信息得到失配指针,使得在每次匹配不成功后,可以不再去处理模式串的已匹配过的部分,进而使得复杂度降为O(N). 对于多模式串匹配问题,当一个模式串与待匹配串不匹配时,失配指针可以指向任意一个串,这就需要我们利用字典树来组织所有模式串并得到失配指…

AC自动机基础题. #include <iostream> #include <cstdio> #include <cstring> #include <cstdlib> #include <queue> using namespace std; #define MAXL 1000005 #define TRIEN 26 ]; typedef struct Trie { int n; Trie *fail; Trie *next[TRIEN];…

FatMouse' Trade Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 56784    Accepted Submission(s): 19009 Problem Description FatMouse prepared M pounds of cat food, ready to trade with the cats g…

Nasty Hacks Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 3049    Accepted Submission(s): 2364 Problem Description You are the CEO of Nasty Hacks Inc., a company that creates small pieces of…

Box of Bricks Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 5994    Accepted Submission(s): 2599 Problem Description Little Bob likes playing with his box of bricks. He puts the bricks one up…