[HDU2222] Keywords Search && AC自动机

#include<cstdio>
#include<algorithm>
#include<cstring>
#include<iostream>
#include<queue>
#define SF scanf
#define PF printf
#define max(a, b) ((a) < (b) ? (b) : (a))
using namespace std;
typedef long long LL;
const int MAXN = 10000;
const int MAXL = 10000 * 50;
const int SZ = 26;
char s[MAXL*2+10];
int ans;
struct Aho_Corasick
{
	int ch[MAXL+10][SZ], Ncnt, val[MAXL+10];
	int f[MAXL+10], last[MAXL+10];
	void init() { 
		memset(ch[0], 0, sizeof(ch[0])); 
		Ncnt = 1; 
		memset(last, 0, sizeof(last)); 
	}
	void New() {
		memset(ch[Ncnt], 0, sizeof(ch[Ncnt]));
		val[Ncnt] = 0;
	}
	inline int ID(char c) { return c - 'a'; }
	void insert(char *s, int pos)
	{
		int u = 0, n = strlen(s);
		for(int i = 0; i < n; i++)
		{
			int c = ID(s[i]);
			if(!ch[u][c]) {
				New();
				ch[u][c] = Ncnt++;
			}
			u = ch[u][c];
		}
		val[u]++;
	}
	void getFail()
	{
		queue <int> q;
		f[0] = 0;
		for(int c = 0; c < SZ; c++)
		{
			int u = ch[0][c];
			if(u) { f[u] = 0; q.push(u); last[u] = 0; }
		}
		while(!q.empty())
		{
			int r = q.front(); q.pop();
			for(int c = 0; c < SZ; c++)
			{
				int u = ch[r][c];
				if(!u) { ch[r][c] = ch[f[r]][c]; continue; }
				q.push(u);
				int v = f[r];
				while(v && !ch[v][c]) v = f[v];
				f[u] = ch[v][c];
				last[u] = val[f[u]] ? f[u] : last[f[u]];
			}
		}
	}
	void add(int j) {
		if(j) {
			ans += val[j]; val[j] = 0; add(last[j]);
		}
	}
	void solve(char *s) {
		int n = strlen(s), j = 0;
		for(int i = 0; i < n; i++)
		{
			int c = ID(s[i]);
			j = ch[j][c];
			if(val[j]) add(j);
			else if(last[j]) add(last[j]);
		}
	}
}ac;
int main()
{
	int T; SF("%d", &T); while(T--) {
		int n; SF("%d", &n);
		ac.init(); ans = 0;
		for(int i = 1; i <= n; i++) {
			SF("%s", s);
			ac.insert(s, i);
		}
		ac.getFail();
		SF("%s", s);
		ac.solve(s);
		PF("%d\n", ans);
	}
}
/*
5
she
he
say
shr
her
yasherhs 
*/