学步园

AC自动机入门题目~

#include <cstdio>
  2 #include <cstring>
  3 
  4 usingnamespace std;
  5 
  6 constint NS =26;
  7 constint MAXWL =64;
  8 constint MAXDL =1000005;
  9 constint MAXN =500005;
 10 constint MAXD =10240;
 11 
 12 char description[MAXDL];
 13 
 14 struct TRIE
 15 {
 16 int lable;
 17 int cnt;
 18     TRIE * fail;
 19     TRIE * son[NS];
 20     TRIE()
 21     {
 22         cnt =0;
 23         lable =-1;
 24         fail = NULL;
 25 for (int i =0;i < NS;i++)
 26             son[i] = NULL;
 27     }
 28 };
 29 
 30 TRIE * queue[MAXN];
 31 
 32 bool vis[MAXD];
 33 
 34 void TrieInsert(char* word,int id,TRIE * root)
 35 {
 36 char* key;
 37     TRIE * tmp;
 38 
 39     key = word;
 40     tmp = root;
 41 
 42 while (*key)
 43     {
 44 int idx = (*key++) -'a';
 45 if (tmp->son[idx] == NULL) tmp->son[idx] =new TRIE();
 46         tmp = tmp->son[idx];
 47     }
 48     tmp->cnt++;
 49     tmp->lable = id;
 50 }
 51 
 52 void getFail(TRIE * root)
 53 {
 54 int qh =-1;
 55 int qe =0;
 56 
 57     root->fail = NULL;
 58     queue[0] = root;
 59 
 60 while (qh != qe)
 61     {
 62         qh++;
 63         TRIE * tmp = queue[qh];
 64 
 65 for (int i =0;i < NS;i++)
 66 if (tmp->son[i])
 67             {
 68 if (tmp == root) tmp->son[i]->fail = root;
 69 else
 70                 {
 71                     TRIE * p = tmp->fail;
 72 while (p)
 73                     {
 74 if (p->son[i])
 75                         {
 76                             tmp->son[i]->fail = p->son[i];
 77 break;
 78                         }
 79                         p = p->fail;
 80                     }
 81 if (p == NULL) tmp->son[i]->fail = root;
 82                 }
 83 
 84                 qe++;
 85                 queue[qe] = tmp->son[i];
 86             }
 87     }
 88 }
 89 
 90 int TrieFind(TRIE * root)
 91 {
 92 int cnt;
 93 char* key;
 94     TRIE * tmp;
 95 
 96     cnt =0;
 97     key = description;
 98     tmp = root;
 99 
100 while (*key)
101     {
102 int idx =*key -'a';
103 while (tmp->son[idx] == NULL && tmp != root) tmp = tmp->fail;
104         tmp = tmp->son[idx] == NULL ? root : tmp->son[idx];
105 
106         TRIE * p = tmp;
107 while (p != root && p->lable !=-1&&!vis[p->lable])
108         {
109             cnt += p->cnt;
110             vis[p->lable] =true;
111             p = p->fail;
112         }
113 
114         key++;
115     }
116 return cnt;
117 }
118 
119 void TrieDelete(TRIE * root)
120 {
121 for (int i =0;i < NS;i++)
122 if (root->son[i])
123             TrieDelete(root->son[i]);
124     delete(root);
125 }
126 
127 
128 int main()
129 {
130 int cas;
131 int wnum;
132 char word[MAXWL];
133 
134     scanf("%d",&cas);
135 
136 for (int cc =0;cc < cas;cc++)
137     {
138         memset(vis,false,sizeof(vis));
139 
140         TRIE * root =new TRIE();
141 
142         scanf("%d",&wnum);
143 for (int i =0;i < wnum;i++)
144         {
145             scanf("%s",word);
146             TrieInsert(word,i +1,root);
147         }
148 
149         getFail(root);
150 
151         scanf("%s",description);
152 
153         printf("%d\n",TrieFind(root));
154 
155         TrieDelete(root);
156     }
157 return0;
158 }