我的第一篇博客

代码如下,AC自动机模板:


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124

using namespace std;
#define clr(a, x) memset(a, x, sizeof(a))
#define mp(x, y) make_pair(x, y)
#define pb(x) push_back(x)
#define X first
#define Y second
#define fastin
ios_base::sync_with_stdio(0);
cin.tie(0);
typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef vector<int> VI;
const int INF = 0x3f3f3f3f;
const int mod = 1e9 + 7;
const double eps = 1e-6;
struct
{
int next[500010][26], fail[500010], end[500010];
int root, L;
int newnode()
{
for (int i = 0; i < 26; i++)
next[L][i] = -1;
end[L++] = 0;
return L - 1;
}
void init()
{
L = 0;
root = newnode();
}
void insert(char buf[])
{
int len = strlen(buf);
int now = root;
for (int i = 0; i < len; i++)
{
if (next[now][buf[i] - 'a'] == -1)
next[now][buf[i] - 'a'] = newnode();
now = next[now][buf[i] - 'a'];
}
end[now]++;
}
void build()
{
queue<int> Q;
fail[root] = root;
for (int i = 0; i < 26; i++)
if (next[root][i] == -1)
next[root][i] = root;
else
{
fail[next[root][i]] = root;
Q.push(next[root][i]);
}
while (!Q.empty())
{
int now = Q.front();
Q.pop();
for (int i = 0; i < 26; i++)
if (next[now][i] == -1)
next[now][i] = next[fail[now]][i];
else
{
fail[next[now][i]] = next[fail[now]][i];//关键
Q.push(next[now][i]);
}
}
}
int query(char buf[])
{
int len = strlen(buf);
int now = root;
int res = 0;
for (int i = 0; i < len; i++)
{
now = next[now][buf[i] - 'a'];
int temp = now;
while (temp != root)
{
res += end[temp];
end[temp] = 0;
temp = fail[temp];
}
}
return res;
}
void debug()
{
for (int i = 0; i < L; i++)
{
printf("id␣=␣%3d,fail␣=␣%3d,end␣=␣%3d,chi␣=␣[", i, fail[i], end[i]);
for (int j = 0; j < 26; j++)
printf("%2d", next[i][j]);
printf("]n");
}
}
};
char buf[1000010];
Trie ac;
int main()
{
int T;
int n;
scanf("%d", &T);
while (T--)
{
scanf("%d", &n);
ac.init();
for (int i = 0; i < n; i++)
{
scanf("%s", buf);
ac.insert(buf);
}
ac.build();
scanf("%s", buf);
printf("%dn", ac.query(buf));
}
system("pause");
return 0;
}