HDU 2222 Keywords Search

Keywords Search

Problem Description

In the modern time, Search engine came into the life of everybody like Google, Baidu, etc.
Wiskey also wants to bring this feature to his image retrieval system.
Every image have a long description, when users type some keywords to find the image, the system will match the keywords with description of image and show the image which the most keywords be matched.
To simplify the problem, giving you a description of image, and some keywords, you should tell me how many keywords will be match.

 

Input

First line will contain one integer means how many cases will follow by.
Each case will contain two integers N means the number of keywords and N keywords follow. (N <= 10000)
Each keyword will only contains characters 'a'-'z', and the length will be not longer than 50.
The last line is the description, and the length will be not longer than 1000000.

 

Output

Print how many keywords are contained in the description.

 

Sample Input

1

5

she

he

say

shr

her

yasherhs

 

Sample Output

3

#include<cstdio>
#include<queue>
#include<string>
#include<map>
#include<cstring>
#include<algorithm>
using namespace std;
typedef long long LL;
const int N=1e6+5;
const int sigma_size=26;
const int max_node=500050;
char text[N],p[10005][55];
bool vis[max_node];
int ans;
struct AhoCorasickAutomata
{
    int ch[max_node][sigma_size];
    int val[max_node],last[max_node],f[max_node],cnt[max_node];
    int sz;
    inline void init()
    {
        sz=1;
        memset(ch[0],0,sizeof(ch[0]));
        memset(cnt,0,sizeof(cnt));
    }
    inline void Count(int j){if(j&&!vis[j])vis[j]=1,ans+=cnt[j],Count(last[j]);}
    inline int idx(char c){return c-'a';}
    void Insert(char *s,int v)
    {
        int u=0,len=strlen(s);
        for(int i=0;i<len;i++)
        {
            int c=idx(s[i]);
            if(!ch[u][c])
            {
                memset(ch[sz],0,sizeof(ch[sz]));
                val[sz]=0;
                ch[u][c]=sz++;
            }
            u=ch[u][c];
        }
        val[u]=v;
        cnt[u]++;
    }
    void Getfail()
    {
        queue<int>q;
        f[0]=0;
        for(int i=0;i<sigma_size;i++)
        {
            int u=ch[0][i];
            if(u){f[u]=0;q.push(u);last[u]=0;}
        }
        while(!q.empty())
        {
            int r=q.front();q.pop();
            for(int i=0;i<sigma_size;i++)
            {
                int u=ch[r][i];
                if(!u){ch[r][i]=ch[f[r]][i];continue;}
                q.push(u);
                int v=f[r];
                while(v&&!ch[v][i])v=f[v];
                f[u]=ch[v][i];
                last[u]=(val[f[u]]?f[u]:last[f[u]]);
            }
        }
    }
    void Find(char* s)
    {
        for(int i=0,j=0,len=strlen(s);i<len;i++)
        {
            int c=idx(s[i]);
            j=ch[j][c];
            if(val[j])Count(j);
            else if(last[j])Count(last[j]);
        }
    }
}ac;
int main()
{
    int T;
    scanf("%d",&T);
    while(T--)
    {
        ans=0;
        memset(vis,0,sizeof(vis));
        ac.init();
        int n;
        scanf("%d",&n);
        for(int i=1;i<=n;i++)
            scanf("%s",p[i]),ac.Insert(p[i],i);
        ac.Getfail();
        scanf("%s",text);
        ac.Find(text);
        printf("%d
",ans);
    }
    return 0;
}