HDU 2896 病毒侵襲

AC自動機模板題。重新學習，熟悉下。

#include<cstdio>
#include<string>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<iostream>
using namespace std;
#define N 100005
char a[205];
char b[10005];
int ans[20];
int n, m;
int idx;
struct Trie {
    Trie *fail;
    Trie *son[128];
    int ex;
};
Trie t[N];
Trie *que[N];
int ptr;
Trie *NewNode(){
    Trie *p = &t[ptr++];
    memset(p->son, NULL, sizeof(p->son));
    p->fail = NULL;
    p->ex = -1;
    return p;
}
void Insert(int id, Trie *root){
    Trie *tmp = root;
    for(int i = 0; a[i]; i++){
        if(tmp->son[a[i]] == NULL)
            tmp->son[a[i]] = NewNode();
        tmp = tmp->son[a[i]];
    }
    tmp->ex = id;
}
void gfail(Trie *root){
    int head = 0, tail = 0;
    que[tail++] = root;
    Trie *tmp;
    while(head < tail){
        tmp = que[head++];
        for(int i = 0; i < 128; i++){
            if(tmp->son[i] != NULL){
                Trie *next = tmp->fail;
                while(next != NULL && next->son[i] == NULL){
                    next = next->fail;
                }
                if(next == NULL)
                    tmp->son[i]->fail = root;
                else
                    tmp->son[i]->fail = next->son[i];
                que[tail++] = tmp->son[i];
            }
        }
    }
}
void AC(Trie *root){
    Trie *tmp = root;
    for(int i = 0; b[i]; i++){
        while(tmp->son[b[i]] == NULL && tmp != root){
            tmp = tmp->fail;
        }
        if(tmp->son[b[i]] == NULL)
            tmp = root;
        else
            tmp = tmp->son[b[i]];
        Trie *p = tmp;
        while(p != root && p->ex != -1){
            ans[idx++] = p->ex;
            p = p->fail;
        }
    }
}
int main()
{
    while(scanf("%d", &m) != EOF){
        ptr = 0;
        Trie *root = NewNode();
        for(int i = 0; i < m; i++){
            scanf("%s", a);
            Insert(i, root);
        }
        gfail(root);
        scanf("%d", &n);
        int tot = 0;
        for(int i = 0; i < n; i++){
            idx = 0;
            scanf("%s", b);
            AC(root);
            if(idx){
                sort(ans, ans + idx);
                printf("web %d: ", i + 1);
                for(int i = 0; i < idx; i++){
                    printf("%d ", ans[i] + 1);
                }
                printf("\n");
                tot ++;
            }
        }
        printf("total: %d\n", tot);
    }
    return 0;
}