题目大意:有个人想破解他邻居的密码,他邻居告诉了一些关于这个密码的信息,并且给他一个单词集合,他用这些信息判断一下最少有多少种密码. 1->, 所有的密码都是有小写字母组成. 2->,密码的长度是 n (1<= n <=25). 3->,密码至少包含 k 种字符集里面的单词.   比如,给集合{"she", "he"},单词长度是3,最少包含两个单词的密码,很明显只能是“she”(题目表述的不清楚).   分析:因为要统计记录到达每个点…

题意: 给出m个模式串,要求构造一长度为n的文本串,至少包括k种模式串,求有多少种可能的模式串. k<=10  然后可以想到状压 一个文本串,k种模式串,很容易想到AC自动机. 把所有的模式串放入AC自动机上面,然后跑状压DP 跟AC自动机有关的DP一般都要用的AC自动机上的节点. dp状态定义为dp[ i ][ j ][status]走到长度为i 时,在AC自动机上 j 这个节点 状态为 status 的方案数. 然后统计答案即可. 由于状态只与上一步有关,所以我滚动了一维,多开一维并不会ML…

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…

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…

Wireless Password Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 5640    Accepted Submission(s): 1785 Problem Description Liyuan lives in a old apartment. One day, he suddenly found that there…

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…

HDU2825 Wireless Password Problem 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 h…

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…

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…

题目连接:http://acm.hdu.edu.cn/showproblem.php?pid=2825 题意:给一些字符串,构造出长度为n的字符串,它至少包含k个所给字符串,求能构造出的个数. 题解: 对end[]节点标记数组进行改动,用二进制下第几位表示即为包含第几个给定子串: 状态转移方程为:dp[i+1][x][k|end[x]]=(dp[i+1][x][k|end[x]]+dp[i][j][k])%mod:(没懂为什么要用' | ' ,等搞明白了在更新吧,,) dp[i][j][l] 表…