AC自动机

AC自动机

#include<iostream>
#include<cstdio>
#include<memory.h>
#include<queue>
#include<cstring>
using namespace std;
#define ri register int
#define rep(i,a,b) for(ri i=(a);i<=(b);i++)
#define N 1000100
#define A 26
int n;
char S[151][71];
char T[N];
struct AC{
	int cnt;
	int ch[N][A],fail[N],val[N],ans[N];
	inline void clear(){
		cnt=0;
		memset(ch,0,sizeof(ch));
		memset(fail,0,sizeof(fail));
		memset(val,0,sizeof(val));
		memset(ans,0,sizeof(ans));
	}
	inline void insert(char* s,int x){
		ri u=0,l=strlen(s);
		rep(i,0,l-1){
			ri v=s[i]-'a';
			if(!ch[u][v])
				ch[u][v]=++cnt;
			u=ch[u][v];
		}
		val[u]=x;
	}
	inline void getFail(){
		queue<int> q;
		rep(i,0,A-1)
			if(ch[0][i]){
				fail[ch[0][i]]=0;
				q.push(ch[0][i]);
			}
		for(;!q.empty();){
			int u=q.front();
			q.pop();
			rep(i,0,A-1){
				if(ch[u][i]){
					fail[ch[u][i]]=ch[fail[u]][i];
					q.push(ch[u][i]);
				}
				else ch[u][i]=ch[fail[u]][i];
			}
		}
	}
	inline void query(char* s){
		ri u=0,l=strlen(s),res=0;
		rep(i,0,l-1){
			u=ch[u][s[i]-'a'];
			for(ri t=u;t;t=fail[t])
				ans[val[t]]++;
		}
		rep(i,1,n)
			res=max(res,ans[i]);
		printf("%d
",res);
		rep(i,1,n)
			if(ans[i]==res)
				printf("%s
",S[i]);
	}
} ac;
int main(){
	for(;scanf("%d",&n)==1 && n;){
		ac.clear();
		rep(i,1,n){
			scanf("%s",S[i]);
			ac.insert(S[i],i);
		}
		ac.getFail();
		scanf("%s",T);
		ac.query(T);
	}
	return 0;
}