HDU 3065 病毒侵袭持续中 （AC自动机）

中文题不解释

Sample Input

   
   
   
   

    
    
    
    3
AA
BB
CC
ooxxCC%dAAAoen....END
   
   
   
   

 

Sample Output

   
   
   
   

    
    
    
    AA: 2
CC: 1
   
   
   
   

输出病毒出现的次数！

#include<stdio.h>
#include<string.h>
#include<queue>
#include<algorithm>
#include<iostream>
using namespace std;
const int kind = 26;
const int M = 1005;
struct node
{
	node *fail;
	node *next[kind];
	int count;
	node()
	{
		fail = NULL;
		count = 0;
		memset(next,0,sizeof(next));
	}
}*q[50*M];
char keyword[1005][55],str[2000010];
int head,tail;
void insert(char *str,node *root,int num)
{
	node *p=root;
	int i=0,index;
	while(str[i])
	{
		index = str[i] - 'A';
		if(p->next[index]==NULL)
			p->next[index] = new node();
		p = p->next[index];
		i++;
	}
	p->count=num;
}

void build_ac(node *root)
{
	int i;
	root->fail=NULL;
	q[head++]=root;
	while(head!=tail)
	{
		node *temp = q[tail++];
		node *p=NULL;
		for(i=0;i<kind;i++)
		{
			if(temp->next[i]!=NULL)
			{
				if(temp==root)	
					temp->next[i]->fail=root;//失败指针指向root
				else 
				{
					p = temp->fail;
					while(p!=NULL)
					{
						if(p->next[i]!=NULL)
						{
							temp->next[i]->fail=p->next[i];
							break;
						}
						p=p->fail;
					}
					if(p==NULL)
						temp->next[i]->fail=root;
				}
				q[head++]=temp->next[i];
			}
		}
	}
}
int vis[1005];
void query(char *str,node *root)
{
	int i=0,cnt=0,index,len=strlen(str);
	node *p=root;
	while(str[i])
	{
		if(str[i]<'A'||str[i]>'Z')
		{
			p=root;
			i++;
			continue;
			
		}
		index = str[i]-'A';
		while(p->next[index]==NULL&&p!=root)
			p = p->fail;
		p=p->next[index];
		p=(p==NULL)?root:p;
		node *temp = p;
		while(temp!=root)
		{
			vis[temp->count]++;
			temp=temp->fail;
		}
		i++;
	}
}

int main()
{
	int n,m;
	while(~scanf("%d",&n))
	{
		head=tail=0;
		node *root = new node();
		getchar();
		for(int i=1;i<=n;i++)
		{
			gets(keyword[i]);
			insert(keyword[i],root,i);
		}
		build_ac(root);
		scanf("%s",str);
		memset(vis,0,sizeof(vis));
		query(str,root);
		for(int i=1;i<=n;i++)
			if(vis[i])
				printf("%s: %d\n",keyword[i],vis[i]);
	}
	return 0;
}