[HDU2896]病毒侵袭(AC自动机)

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题目中文描述,赞!

除了val记录id以外就是模板。

注意:每次数组都要清0.0

——代码

 1 #include <cstdio>
 2 #include <queue>
 3 #include <cstring>
 4 #include <algorithm>
 5 
 6 using namespace std;
 7 
 8 int n, m, sz, tot;
 9 int ch[100005][130], val[100005], ans[100005], fail[100005];
10 bool vis[100005];
11 char s[100005];
12 
13 inline void insert(int id)
14 {
15     int i, x, now = 0, len = strlen(s);
16     for(i = 0; i < len; i++)
17     {
18         x = s[i];
19         if(!ch[now][x]) ch[now][x] = ++sz;
20         now = ch[now][x];
21     }
22     val[now] = id;
23 }
24 
25 inline void make_fail()
26 {
27     int i, now;
28     queue <int> q;
29     for(i = 0; i <= 128; i++)
30      if(ch[0][i])
31       q.push(ch[0][i]);
32     while(!q.empty())
33     {
34         now = q.front(), q.pop();
35         for(i = 0; i <= 128; i++)
36         {
37             if(!ch[now][i])
38             {
39                 ch[now][i] = ch[fail[now]][i];
40                 continue;
41             }
42             fail[ch[now][i]] = ch[fail[now]][i];
43             q.push(ch[now][i]);
44         }
45     }
46 }
47 
48 inline void ac()
49 {
50     int i, now = 0, x, y, len = strlen(s);
51     for(i = 0; i < len; i++)
52     {
53         vis[now] = 1;
54         x = s[i];
55         y = ch[now][x];
56         while(y && !vis[y])
57         {
58             vis[y] = 1;
59             if(val[y]) ans[++ans[0]] = val[y];
60             y = fail[y];
61         }
62         now = ch[now][x];
63     }
64 }
65 
66 int main()
67 {
68     int i, j;
69     scanf("%d", &n);
70     for(i = 1; i <= n; i++)
71     {
72         scanf("%s", s);
73         insert(i);
74     }
75     make_fail();
76     scanf("%d", &m);
77     for(i = 1; i <= m; i++)
78     {
79         scanf("%s", s);
80         memset(vis, 0, sizeof(vis));
81         memset(ans, 0, sizeof(ans));
82         ac();
83         if(ans[0])
84         {
85             printf("web %d:", i);
86             sort(ans + 1, ans + ans[0] + 1);
87             for(j = 1; j <= ans[0]; j++) printf(" %d", ans[j]);
88             printf("\n");
89             tot++;
90         }
91     }
92     printf("total: %d\n", tot);
93     return 0;
94 }
View Code

 

posted @ 2017-04-23 19:08  zht467  阅读(148)  评论(0编辑  收藏  举报