hdu2222-AC自动机&模板-Keywords Search

#include <bits/stdc++.h>
using namespace std;
struct Trie
{
int next[500010][26],fail[500010],end[500010];
int root,L;
int newnode()
{
for(int i = 0;i < 26;i++)
next[L][i] = -1;
end[L++] = 0;
return L-1;
}
void init()
{
L = 0;
root = newnode();
}
void insert(char buf[])
{
int len = strlen(buf);
int now = root;
for(int i = 0;i < len;i++)
{
if(next[now][buf[i]-'a'] == -1)
next[now][buf[i]-'a'] = newnode();
now = next[now][buf[i]-'a'];
}
end[now]++;
}
void build()
{  //广搜构造，失配指针
queue<int>Q;
fail[root] = root;
for(int i = 0;i < 26;i++)
if(next[root][i] == -1)
next[root][i] = root;
else
{
fail[next[root][i]] = root;
Q.push(next[root][i]);
}
while( !Q.empty() )
{
int now = Q.front();
Q.pop();
for(int i = 0;i < 26;i++)
if(next[now][i] == -1)
next[now][i] = next[fail[now]][i];
else
{
fail[next[now][i]]=next[fail[now]][i];
Q.push(next[now][i]);
}
}
}
int query(char buf[])
{
int len = strlen(buf);
int now = root;
int res = 0;
for(int i = 0;i < len;i++)
{
now = next[now][buf[i]-'a'];
int temp = now;
while( temp != root )
{
res += end[temp];
end[temp] = 0;
temp = fail[temp];
}
}
return res;
}
void debug()
{
for(int i = 0;i < L;i++)
{
printf("id = %3d,fail = %3d,end = %3d,chi = [",i,fail[i],end[i]);
for(int j = 0;j < 26;j++)
printf("%2d",next[i][j]);
printf("]\n");
}
}
};
Trie ac;
char s[1000006];
int main()
{    int t,m;
scanf("%d",&t);
while(t--){
ac.init();//初始化
scanf("%d",&m);
getchar();
for(int i=0;i<m;i++){
scanf("%s",s);
ac.insert(s);//插入
}
ac.build();//广搜 构造失配指针。
scanf("%s",s);
printf("%d\n",ac.query(s));

}
return 0;
}