无聊弄个字典树的模板。自己一直不是很懂字典树。。可能要学数据结构之后自己再深究一下。。这个比较重要。。
前缀:
#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
#define MAXS 26
#define MAXL 22
#define MAXN 1005
char str[MAXN][MAXL];
struct node
{
int num;//num表示用到该节点的字符串的个数,num=1时说明该节点是该字符串唯一的节点
node *next[MAXS];
node()
{
num=0;
for(int i=0;i<MAXS;i++)
{
next[i]=NULL;
}
}
}*root;
void insert(node *rt,char *str)
{
int i,id,len;
len=strlen(str);
for(i=0;i<len;i++)
{
id=str[i]-'a';
if(rt->next[id]==NULL)
rt->next[id]=new node();
rt=rt->next[id];
rt->num++;
}
}
void serch(node *rt,char *s)
{
int i,id,len;
len=strlen(s);
for(i=0;i<len;i++)
{
id=s[i]-'a';
if(rt->num==1) //结束查找,已经找到了最短前缀
break;
printf("%c",s[i]);
rt=rt->next[id];
}
printf("\n");
}
int main()
{
int total=0;
int i;
root=new node();
while(scanf("%s",&str[total])!=EOF)
{
insert(root,str[total]);
total++;
}
for(i=0;i<total;i++)
{
printf("%s ",str[i]);
serch(root,str[i]);
}
return 0;
}
对应的来个后缀的:
#include <iostream>
using namespace std;
const int MAXM = 30,KIND = 26;
int m;
struct node
{
char* s;
int prefix;
bool isword;
node* next[KIND];
node()
{
s = NULL;
prefix = 0;
isword = false;
memset(next,0,sizeof(next));
}
}*root;//根
void insert(node *root,char *s)//插入
{
node *p = root;
for (int i = 0;s[i];i++)
{
int x = s[i] - 'a';
p->s = s+i;
if (p->next[x] == NULL)
p->next[x] = new node;
p = p->next[x];
p->prefix++;
}
p->isword = true;
}
bool del(node *root,char *s)//删除
{
node *p = root;
for (int i = 0;s[i];i++)
{
int x = s[i] - 'a';
if (p->next[x] == NULL)
return false;
p = p->next[x];
}
if (p->isword)
p->isword = false;
else
return false;
return true;
}
bool search(node *root,char* s)//查找
{
node* p = root;
for (int i = 0;s[i];i++)
{
int x = s[i]-'a';
if (p->next[x] == NULL)
return false;
p = p->next[x];
}
return p->isword;
}
int count(node *root,char *s)//统计后缀
{
node *p = root;
for (int i = 0;s[i];i++)
{
int x = s[i] - 'a';
if (p->next[x] == NULL)
return 0;
p = p->next[x];
}
return p->prefix;
}
int main()
{
m = 0;
root = new node;
char s[MAXM];
while (gets(s))
{
if (strcmp(s,"")==0)
break;
insert(root,s);
}
while (gets(s))
printf("%d\n",count(root,s));
return 0;
}