codeforces852GBathroom terminal解题报告

Smith wakes up at the side of a dirty, disused bathroom, his ankle chained to pipes. Next to him is tape-player with a hand-written message "Play Me". He finds a tape in his own back pocket. After putting the tape in the tape-player, he sees a key hanging from a ceiling, chained to some kind of a machine, which is connected to the terminal next to him. After pressing a Play button a rough voice starts playing from the tape:

"Listen up Smith. As you can see, you are in pretty tough situation and in order to escape, you have to solve a puzzle.

You are given N strings which represent words. Each word is of the maximum lengthL and consists of characters 'a'-'e'. You are also givenM strings which represent patterns. Pattern is a string of length ≤  L and consists of characters 'a'-'e' as well as the maximum 3 characters '?'. Character '?' is an unknown character, meaning it can be equal to any character 'a'-'e', or even an empty character. For each pattern find the number of words that matches with the given pattern. After solving it and typing the result in the terminal, the key will drop from the ceiling and you may escape. Let the game begin."

Help Smith escape.

Input

The first line of input contains two integers N andM (1 ≤ N ≤  100 000,1 ≤ M ≤  5000), representing the number of words and patterns respectively.

The next N lines represent each word, and after thoseN lines, following M lines represent each pattern. Each word and each pattern has a maximum lengthL (1 ≤ L ≤ 50). Each pattern has no more that three characters '?'. All other characters in words and patters are lowercase English letters from 'a' to 'e'.

Output

Output contains M lines and each line consists of one integer, representing the number of words that match the corresponding pattern.

Example

Input

3 1abcaecaca?c

Output

3

Note

If we switch '?' with 'b', 'e' and with empty character, we get 'abc', 'aec' and 'ac' respectively.

题解：

trie树 查询直接在trie树上查询 查到节点打上tag

查到合法的叶子节点就+上单词个数

代码：

#include <iostream>#include <cstdio>#include <string>using namespace std;const int maxn=5000000+10;int ch[maxn][6];int val[maxn];int tag[maxn];string s;int sz=0;int le;int no;inline int idx(char c){return c-'a';}inline void insert(){int now=0;for(int i=0;i<le;i++){int u=idx(s[i]);if(!ch[now][u]){ch[now][u]=++sz;now=sz;}else now=ch[now][u];}val[now]++;}int cnt=0;inline void find(int now,int pl){if(pl==le){if(val[now]&&tag[now]!=no){cnt+=val[now];tag[now]=no;}return ;}if(s[pl]!='?'){int u=idx(s[pl]);if(ch[now][u])find(ch[now][u],pl+1);}else {find(now,pl+1);for(int i=0;i<5;i++){if(ch[now][i])find(ch[now][i],pl+1);}}}int main(){//freopen("a.in","r",stdin);//freopen("a.out","w",stdout);int n,m;scanf("%d %d",&n,&m);for(int i=1;i<=n;i++){cin>>s;le=s.length();insert();}for(int i=1;i<=m;i++){cin>>s;no=i;cnt=0;le=s.length();find(0,0);printf("%d\n",cnt);}return 0;}