luoguP3796[模板]AC自动机(加强版)

传送门

ac自动机模板,可能我写的ac自动机是有点问题的,所以跑的有些慢
暴力跳fail统计
代码:

#include<cstdio>
#include<iostream>
#include<algorithm>
#include<cstring>
#include<queue>
using namespace std;
void read(int &x) {
	char ch; bool ok;
	for(ok=0,ch=getchar(); !isdigit(ch); ch=getchar()) if(ch=='-') ok=1;
	for(x=0; isdigit(ch); x=x*10+ch-'0',ch=getchar()); if(ok) x=-x;
}
#define rg register
const int maxn=1e6+10;queue<int>q;
int ed[151],fail[maxn],n,rt=1,id=1,ch[maxn][26],ans,vis[maxn],w[151];char s[151][maxn],ss[maxn];
void insert(char *s,int d)
{
	w[d]=strlen(s+1);rt=1;
	for(rg int i=1;i<=w[d];i++)
	{
		int now=s[i]-'a';
		if(!ch[rt][now])ch[rt][now]=++id;
		rt=ch[rt][now];
	}
	ed[d]=rt;
}
void bfs()
{
	q.push(1);
	while(!q.empty())
	{
		int x=q.front();q.pop();
		for(rg int i=0;i<26;i++)
		{
			if(!ch[x][i]){ch[x][i]=fail[x]?ch[fail[x]][i]:1;continue;}
			int j=fail[x],z=ch[x][i];q.push(z);
			while(j&&!ch[j][i])j=fail[j];
			if(j)fail[z]=ch[j][i];
			else fail[z]=1;
		}
	}
}
void solve()
{
	int j=1,len=strlen(ss+1);
	for(rg int i=1;i<=len;i++)
	{
		int now=ss[i]-'a';
		while(j&&!ch[j][now])j=fail[j];
		if(!ch[j][now])continue;j=ch[j][now];int k=j;
		while(k)vis[k]++,k=fail[k];
	}
	int  mx=0;
	for(rg int i=1;i<=n;i++)if(mx<vis[ed[i]])mx=vis[ed[i]];
	printf("%d\n",mx);
	for(rg int i=1;i<=n;i++)
		if(mx==vis[ed[i]]){for(rg int j=1;j<=w[i];j++)printf("%c",s[i][j]);printf("\n");}
}
int main()
{
	while(1)
	{
		read(n);if(!n)return 0;id=1;
		memset(ch,0,sizeof ch);
		memset(fail,0,sizeof fail);
		memset(vis,0,sizeof vis);
		for(rg int i=1;i<=n;i++)scanf("%s",s[i]+1),insert(s[i],i);
		bfs(),scanf("%s",ss+1),solve();
	}
}
posted @ 2019-02-25 17:00  蒟蒻--lichenxi  阅读(139)  评论(0编辑  收藏  举报