HDU 2896 病毒侵袭 AC自动机

//#pragma comment(linker, "/STACK:1024000000,1024000000")
#include<cstdio>
#include<cstring>
#include<cstdlib>
#include<algorithm>
#include<iostream>
#include<sstream>
#include<cmath>
#include<climits>
#include<string>
#include<map>
#include<queue>
#include<vector>
#include<stack>
#include<set>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
#define pb(a) push_back(a)
#define INF 0x1f1f1f1f
#define lson idx<<1,l,mid
#define rson idx<<1|1,mid+1,r
#define PI  3.1415926535898
template<class T> T min(const T& a,const T& b,const T& c) {
    return min(min(a,b),min(a,c));
}
template<class T> T max(const T& a,const T& b,const T& c) {
    return max(max(a,b),max(a,c));
}
void debug() {
#ifdef ONLINE_JUDGE
#else

    freopen("d:\in.txt","r",stdin);
   // freopen("d:\out1.txt","w",stdout);
#endif
}
int getch() {
    int ch;
    while((ch=getchar())!=EOF) {
        if(ch!=' '&&ch!='
')return ch;
    }
    return EOF;
}

const int SIGMA_SIZE=128;
struct node
{
    node *next[SIGMA_SIZE];
    node *fail;
    int val;
    node(){memset(next,0,sizeof(next));fail=NULL;val=0;}
};
struct ACAutomation
{
    node* root;
    void init(){root=new node;}
    int insert(const char *s,const int& v)
    {
        node *p=root;
        for(int i=0;s[i]!='';i++)
        {
            if(p->next[s[i]]!=NULL)p=p->next[s[i]];
            else p=p->next[s[i]]=new node;
        }
        p->val=v;
        return 0;
    }
    int construct()
    {
        root->fail=root;
        queue<node*> q;
        for(int c=0;c<SIGMA_SIZE;c++)
        {
            node *u=root->next[c];
            if(u!=NULL){u->fail=root;q.push(u);}
        }
        while(!q.empty())
        {
            node *r=q.front();q.pop();
            for(int c=0;c<SIGMA_SIZE;c++)
            {
                node* u=r->next[c];
                if(u==NULL){r->next[c]=r->fail->next[c];continue;}
                q.push(u);
                node* v=r->fail;
                while(v!=root&&v->next[c]!=NULL)v=v->fail;
                u->fail=v->next[c];
            }
        }
        return 0;
    }
    void count(node *u,int &num,int *da)
    {
        if(u->val&&!da[u->val])
        {
            num++;
            da[u->val]=1;
            
        }
        if(u->fail!=root&&!da[u->fail->val])count(u->fail,num,da);
    }
    int find(const char *s,int *da)
    {
        int num=0;
        node * u=root;
        for(int i=0;s[i]!='';i++)
        {
            u=u->next[s[i]];
            if(u->val)count(u,num,da);
        }
        return num;
    }
    void free(node *p)
    {
        for(int c='a';c<SIGMA_SIZE;c++)
            if(p->next[c]!=NULL)free(p->next[c]);
        delete p;
    }
}ac;
int n,m;
char T[10010];

int main()
{
    while(scanf("%d",&n)!=EOF)
    {
        ac.init();
        char s[222];
        for(int i=1;i<=n;i++)
        {
            scanf("%s",s);
            ac.insert(s,i);
        }
        ac.construct();
        scanf("%d",&m);
        int num=0;
        for(int i=1;i<=m;i++)
        {
            scanf("%s",T);
            int da[555];
            memset(da,0,sizeof(da));
            int k=ac.find(T,da);
            if(k>0)
            {
                printf("web %d:",i);
                for(int j=1;j<=500;j++)if(da[j])
                    printf(" %d",j);
                printf("
");
                num++;
            }
        }
        printf("total: %d
",num);
       // ac.free(ac.root);
    }
    return 0;
}
View Code
原文地址:https://www.cnblogs.com/BMan/p/3374631.html