字典树模板！

 1 #include <iostream>
 2 #include <cstdlib>
 3 #include <cstdio>
 4
 5 using namespace std;
 6
 7 struct tree
 8 {
 9     int count;
10     tree *next[26];
11 };
12 tree *head;
13
14 void Insert(char *ch)
15 {
16     int pp=0;
17     tree *p;
18     p=head;
19     for(;;)
20     {
21         if(ch[pp]==‘\0‘) break;
22         if(p->next[ch[pp]-‘a‘]!=NULL)
23         {
24             p=p->next[ch[pp]-‘a‘];
25             p->count++;
26         }
27         else
28         {
29             tree *Q=(tree *)malloc(sizeof(tree));
30             Q->count=1;
31             for(int i=0;i<26;i++)
32             {
33                 Q->next[i]=NULL;
34             }
35             p->next[ch[pp]-‘a‘]=Q;
36             p=Q;
37         }
38         pp++;
39     }
40 }
41
42 int find(char *ch)
43 {
44     tree *p=head;
45     int pp=0;
46     for(;;)
47     {
48         if(ch[pp]==‘\0‘) return p->count;
49         if(p->next[ch[pp]-‘a‘]==NULL) return 0;
50         p=p->next[ch[pp]-‘a‘];
51         pp++;
52     }
53     return 0;
54 }
55 int main()
56 {
57    // freopen("ACM.txt","r",stdin);
58     head=(tree *)malloc(sizeof(tree));
59     for(int i=0;i<26;i++)
60         head->next[i]=NULL;
61     //char a[12],b[12];
62     //while(gets(a)&&a[0]!=‘\0‘)
63     //{
64     //    Insert(a);
65     //}
66     //while(scanf("%s",b)!=EOF)
67     //{
68     //   cout<<find(b)<<endl;
69     //}
70
71     return 0;
72 }