Searching the String Time Limit: 7 Seconds      Memory Limit: 129872 KB Little jay really hates to deal with string. But moondy likes it very much, and she's so mischievous that she often gives jay some dull problems related to string. And one day, m…

Description Little jay really hates to deal with string. But moondy likes it very much, and she's so mischievous that she often gives jay some dull problems related to string. And one day, moondy gave jay another problem, poor jay finally broke out a…

题目链接:Searching the String 解析:给一个长串.给n个不同种类的短串.问分别在能重叠下或者不能重叠下短串在长串中出现的次数. 能重叠的已经是最简单的AC自己主动机模板题了. 不能重叠的记录一下每一个匹配的串的起始位置保证不重叠就可以. AC代码: #include <bits/stdc++.h> using namespace std; struct Trie{ int next[600010][26], fail[600010], deep[600010]; int r…

题目链接:https://vjudge.net/problem/ZOJ-3228 Searching the String Time Limit: 7 Seconds      Memory Limit: 129872 KB Little jay really hates to deal with string. But moondy likes it very much, and she's so mischievous that she often gives jay some dull p…

/** 题目:zoj3228 Searching the String 链接:http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=3441 题意:给定一个长度为N(N <= 105)的目标串,然后再给定M(M <= 105)个长度不大于6的字符串, 问这些字符串在目标串的出现次数(分可重叠和不可重叠两种). 题解:可以覆盖情况下,直接建立自动机求次数.注意可能出现类型相同以及字符串相同.所以用map标记: 不可以覆盖情况下,直接…

题目大意 给定一个文本串,接下来有n个模式串,每次查询模式串出现的次数,查询分两种,可重叠和不可重叠 题解 第一次是把AC自动机构造好,跑n次,统计出每个模式串出现的次数,交上去果断TLE...后来想想其实只要跑一次文本串即可... 这个题目主要的问题是要解决有可重叠和不可重叠两种情况,用一个数组记录下模式串上一次出现的位置就可以判断是否重叠了 代码: #include <cstdio> #include <iostream> #include <algorithm>…

Description Little jay really hates to deal with string. But moondy likes it very much, and she's so mischievous that she often gives jay some dull problems related to string. And one day, moondy gave jay another problem, poor jay finally broke out a…

题目链接:https://vjudge.net/problem/ZOJ-3430 Detect the Virus Time Limit: 2 Seconds      Memory Limit: 65536 KB One day, Nobita found that his computer is extremely slow. After several hours' work, he finally found that it was a virus that made his poor…

题目大意 给一棵树,每条边上有一个字符,求有多少对 \((x,y)(x<y)\),满足 \(x\) 到 \(y\) 路径上的边上的字符按顺序组成的字符串为回文串. \(1\leq n\leq 50000,1\leq x_i,y_i\leq n,z_i\in\{0,1\}\) 题解 观察一条经过重心的回文串是长什么样的 \(S\) 是一个任意的字符串,\(T\) 是一个回文串. 建出根到每个节点对应的串的AC自动机. 那么 \(x\) 这边的 \(S\) 串就是 \(x\) 对应的AC自动机节点的…

题目链接 Problem Description As we know, Rikka is poor at math. Yuta is worrying about this situation, so he gives Rikka some math tasks to practice. There is one of them: Yuta has n 01 strings si, and he wants to know the number of 01 antisymmetric stri…