AC自动机模板

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<queue>
using namespace std;
const int MAXN = 10000000;
struct node
{
    int count;
    int id;
    int deepth;
    node *next[26];
    node *fail;
};
node *q[MAXN];
char keyword[55];
char str[1000010];
int head,tail;
int position[100001];
node *root;
void insert(char *word,node *root,int id)
{
    int index,len;
    node *p = root,*newnode;
    len = strlen(word);
    for(int i=0 ; i < len ; i++ )
    {
        index=word[i]-'a';
        if(!p->next[index])
        {
            newnode=(struct node *)malloc(sizeof(struct node));
            for(int j=0; j<26; j++) newnode->next[j]=0;
            newnode->id=0;
            newnode->count=0;
            newnode->fail=0;
            newnode->deepth=p->deepth+1;
            p->next[index]=newnode;
        }
        p=p->next[index];
    }
    p->count++;
    p->id=id;
}
void build_ac_automation(node *root)
{
    head=0;
    tail=1;
    q[head]=root;
    node *temp,*p;
    while(head<tail)
    {
        temp=q[head++];
        for(int i=0; i< 26 ; i ++)
        {
            if(temp->next[i])
            {
                if(temp==root)temp->next[i]->fail=root;
                else
                {
                    p=temp->fail;
                    while(p)
                    {
                        if(p->next[i])
                        {
                            temp->next[i]->fail=p->next[i];
                            break;
                        }
                        p=p->fail;
                    }
                    if(!p)temp->next[i]->fail=root;
                }
                q[tail++]=temp->next[i];
            }
        }
    }
}
int query(node *root)
{
    int i,cnt=0,index,len=strlen(str);
    node *p=root;
    for(i=0; i < len ; i ++)
    {
        index=str[i]-'a';
        while( !p->next[index] && p != root)p=p->fail;
        p=p->next[index];
        if(!p)p=root;
        node *temp=p;
        while(temp != root )
        {
            if(temp->count>=0)
            {
                cnt+=temp->count;
                position[temp->id]=i+1-temp->deepth;
                temp->count=-1;
            }
            else break;
            temp=temp->fail;
        }
    }
    return cnt;
}
int main()
{
    int i,t,n,ans;
    scanf("%d",&t);
    while(t--)
    {
        memset(position,-1,sizeof(position));
        root=(struct node *)malloc(sizeof(struct node));
        for(int j=0; j<26; j++) root->next[j]=0;
        root->fail=0;
        root->count=0;
        scanf("%d",&n);
        getchar();
        for(i=0; i<n; i++)
        {
            gets(keyword);
            insert(keyword,root,i+1);
        }
        build_ac_automation(root);
        gets(str);
        ans=query(root);
        printf("%d\n",ans);
        //for(int i=1; i<=n; i++)printf("position:%d\n",position[i]);打出匹配位置 
    }
    fclose(stdin);
    fclose(stdout);
    return 0;
}