链接 状压dp+ac dp[i+1][next[j]][st|tt]表示第i+1长度结点为next[j]状态为st|tt的时候的ans; dp[i+1][next[j]][st|tt]+=dp[i][j][tt]; st记录当前结点是否为给定单词的结束点 后一维用01状态表示截止到目前结点为止所包含的单词数量. 需要修改ac模板的一个地方,val[u]|=val[fail[u]]; #include <iostream> #include<cstdio> #include<c…

http://acm.hust.edu.cn/vjudge/problem/16883 题意:要构造一个长度为n的字符串,然后有m模板串构成一个集合(m<=10),构造出来的字符串至少含有k种模板串.全部为小写. 题解: 没有打.d[s][l][x]表示当前已有的模板串集合s,已构造了长度为l的串,在AC自动机上的位置为x,然后dp即可.…

Wireless Password Time Limit: 1000MS   Memory Limit: 32768KB   64bit IO Format: %I64d & %I64u Description Liyuan lives in a old apartment. One day, he suddenly found that there was a wireless network in the building. Liyuan did not know the password…

Wireless Password Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 4022    Accepted Submission(s): 1196 Problem Description Liyuan lives in a old apartment. One day, he suddenly found that there…

Description Liyuan lives in a old apartment. One day, he suddenly found that there was a wireless network in the building. Liyuan did not know the password of the network, but he got some important information from his neighbor. He knew the password…

题目链接:hdu_2825_Wireless Password 题意: 给你m个串,问长度为n至少含k个串的字符串有多少个 题解: 设dp[i][j][k]表示考虑到长度为i,第j个自动机的节点,含有k这个压缩状态的方案数,然后DP下去就行了 #include<bits/stdc++.h> #define F(i,a,b) for(int i=a;i<=b;i++) using namespace std; ; *,tyn=;//数量乘串长,类型数 struct AC_automatio…

题目链接:https://vjudge.net/problem/HDU-2825 Wireless Password Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 7733    Accepted Submission(s): 2509 Problem Description Liyuan lives in a old apartmen…

pid=2825">http://acm.hdu.edu.cn/showproblem.php? pid=2825 Wireless Password Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 4560    Accepted Submission(s): 1381 Problem Description Liyuan li…

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 5400    Accepted Submission(s): 1704 Problem Description Liyuan lives in a old apartment. One day, he suddenly found that there was a wireless ne…

题目大意:给一系列字符串,用小写字母构造出长度为n的至少包含k个字符串的字符串,求能构造出的个数. 题目分析:在AC自动机上走n步,至少经过k个单词节点,求有多少种走法. 代码如下: # include<iostream> # include<cstdio> # include<queue> # include<cstring> # include<algorithm> using namespace std; typedef long long…