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 consists only of lowercase letters 'a'-'z', and he knew the length of the password. Furthermore, he got a magic word set, and his neighbor told him that the password included at least k words of the magic word set (the k words in the password possibly overlapping).
For instance, say that you know that the password is 3 characters long, and the magic word set includes 'she' and 'he'. Then the possible password is only 'she'.
Liyuan wants to know whether the information is enough to reduce the number of possible passwords. To answer this, please help him write a program that determines the number of possible passwords.
InputThere will be several data sets. Each data set will begin with a line with three integers n m k. n is the length of the password (1<=n<=25), m is the number of the words in the magic word set(0<=m<=10), and the number k denotes that the password included at least k words of the magic set. This is followed by m lines, each containing a word of the magic set, each word consists of between 1 and 10 lowercase letters 'a'-'z'. End of input will be marked by a line with n=0 m=0 k=0, which should not be processed. OutputFor each test case, please output the number of possible passwords MOD 20090717. Sample Input
10 2 2
hello
world
4 1 1
icpc
10 0 0
0 0 0
Sample Output
2
1
14195065
题目大意:给定N个单词,求至少包含其中K个的长度为Len的字符串数量。
解题思路:利用状压DP暴力求解 ,最后统计一下其满足条件的字符串个数。
DP[len][i][m] 代表长度为len ,i 个节点,在状态为m下满足条件的个数
Status |
Accepted |
Time |
702ms |
Memory |
8188kB |
Length |
5234 |
Lang |
G++ |
Submitted |
2017-04-14 08:33:17 |
Shared |
|
RemoteRunId |
20411126 |
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