AC自动机 洛谷 模板

#pragma warning(disable:4996)

#include<iostream>
#include<algorithm>
#include<bitset>
#include<tuple>
#include<unordered_map>
#include<fstream>
#include<iomanip>
#include<string>
#include<cmath>
#include<cstring>
#include<vector>
#include<map>
#include<set>
#include<list>
#include<queue>
#include<stack>
#include<sstream>
#include<cstdio>
#include<ctime>
#include<cstdlib>
#define INF 0x3f3f3f3f
#define inf 0x7FFFFFFF
#define MOD 998244353
#define moD 1000000003
#define pii pair<int,string>
#define eps 1e-8
#define equals(a,b) (fabs(a-b)<eps)
#define bug puts("bug")
#define re  register
#define fi first
#define se second
const int maxn = 1e6 + 5;
const double Inf = 10000.0;
const double PI = acos(-1.0);
typedef  long long ll;
typedef unsigned long long ull;
using namespace std;

char s[151][71];
char ss[maxn];
int m;

struct Aho {
    int Node_cnt, f[maxn], ch[maxn][26], cnt[maxn], val[maxn], last[maxn];
    void clear() {
        memset(f, 0, sizeof f);
        memset(ch, 0, sizeof ch);
        memset(cnt, 0, sizeof cnt);
        memset(val, 0, sizeof val);
        memset(last, 0, sizeof last);
        Node_cnt = 0;
    }
    void insert(char* s, int idx) {
        int u = 0, n = strlen(s);
        for (int i = 0; i < n; i++) {
            int c = s[i] - 'a';
            if (!ch[u][c]) ch[u][c] = ++Node_cnt;
            u = ch[u][c];
        }
        val[u] = idx;
    }
    void getFail() {
        queue<int> q;
        q.push(0);
        while (!q.empty()) {
            int u = q.front(), k = f[u];
            q.pop();
            for (int c = 0; c < 26; c++) {
                int v = ch[u][c];
                if (!v) {
                    ch[u][c] = ch[k][c];
                    continue;
                }
                f[v] = u ? ch[k][c] : 0;
                last[v] = val[f[v]] ? f[v] : last[f[v]];
                q.push(v);
            }
        }
    }
    void query(char *ss) {
        int u = 0, n = strlen(ss), res = 0;
        for (int i = 0; i < n; i++) {
            int c = ss[i] - 'a';
            u = ch[u][c];
            if (val[u]) cnt[val[u]]++;
            int v = last[u];
            while (v) {
                if (val[v]) cnt[val[v]]++;
                v = last[v];
            }
        }
        for (int i = 1; i <= m; i++) res = max(res, cnt[i]);
        printf("%d
", res);
        for (int i = 1; i <= m; i++) if (cnt[i] == res) printf("%s
", s[i]);
        return;
    }
}AC;

int main() {
    while (scanf("%d", &m), m) {
        AC.clear();
        for (int i = 1; i <= m; i++) scanf("%s", s[i]), AC.insert(s[i], i);
        AC.getFail();
        scanf("%s", ss);
        AC.query(ss);
    }
}