标签:des style blog http color java os io
3 aaa bbb ccc 2 aaabbbccc bbaacc
web 1: 1 2 3 total: 1
#include<cstdio>
#include<set>
using namespace std;
const int kind = 128; //有多少种字符
const int N = 505;
const int M = 10005;
struct node
{
node *next[kind];
node *fail;
int id;//病毒编号
int cnt; //是不是病毒单词的结尾
node() {
for(int i = 0; i < kind; i++)
next[i] = NULL;
cnt = 0; //0表示不是单词结尾
fail = NULL;
}
}*q[200*N];
node *root;
int head, tail;
char web[M];
char vir[205];
set<int> id_set; //记录每个网站的病毒编号,因为一个病毒可能会在一个网站出现多次,set可以直接去重
set<int> ::iterator it;
void Insert(char *str, int id)
{
node *p = root;
int i = 0, index;
while(str[i]) {
index = str[i] - ' ';
if(p->next[index] == NULL)
p->next[index] = new node();
p = p->next[index];
i++;
}
p->cnt++;
p->id = id;
}
void build_ac_automation(node *root)
{
root->fail = NULL;
q[tail++] = root;
node *p = NULL;
while(head < tail) {
node *temp = q[head++];
for(int i = 0; i < kind; i++) {
if(temp->next[i] != NULL) {
if(temp == root) temp->next[i]->fail = 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[tail++] = temp->next[i];
}
}
}
}
int Query(char *str)
{
id_set.clear();
int i = 0, index;
node *p = root;
while(str[i]) {
index = str[i] - ' ';
while(p->next[index] == NULL && p != root) p = p->fail;
p = p->next[index];
if(p == NULL) p = root;
node *temp = p;
while(temp != root && temp->cnt > 0) {
id_set.insert(temp->id);
temp = temp->fail;
}
i++;
}
return id_set.size();
}
int main()
{
int m, n;
while(~scanf("%d",&n)) {
int total = 0;
head = tail = 0;
root = new node();
for(int i = 1; i <= n; i++) {
scanf("%s", vir);
Insert(vir, i);
}
build_ac_automation(root);
scanf("%d",&m);
for(int i = 1; i <= m; i++){
scanf("%s",web);
int s = Query(web);
if(s) {
total++;
printf("web %d:", i);
for(it = id_set.begin(); it != id_set.end(); it++)
printf(" %d", *it);
printf("\n");
}
}
printf("total: %d\n", total);
}
return 0;
}hdu 2896 病毒侵袭(AC自动机),布布扣,bubuko.com
标签:des style blog http color java os io
原文地址:http://blog.csdn.net/lyhvoyage/article/details/38586077