http://acm.hdu.edu.cn/showproblem.php?pid=1251
banana band bee absolute acm ba b band abc
2 3 1 0
/**
hdu 1251 Tire树(字典树)的应用
解题思路:构造字典树,查询公共前缀的个数,算是个模板吧
*/
#include <stdio.h>
#include <string.h>
#include <algorithm>
#include <iostream>
using namespace std;
struct node
{
    int count;
    node *childs[26];
    node()
    {
        count=0;
        for(int i=0;i<26;i++)
        {
            childs[i]=NULL;
        }
    }
};
node *root=new node;
node *current,*newnode;
void insert(char *str)
{
    current=root;
    int len=strlen(str);
    for(int i=0;i<len;i++)
    {
        int m=str[i]-'a';
        if(current->childs[m]!=NULL)
        {
            current=current->childs[m];
            ++(current->count);
        }
        else
        {
            newnode=new node;
            ++(newnode->count);
            current->childs[m]=newnode;
            current=newnode;
        }
    }
}
int search(char *str)
{
    current=root;
    int len=strlen(str);
    for(int i=0;i<len;i++)
    {
        int m=str[i]-'a';
        if(current->childs[m]==NULL)
            return 0;
        current=current->childs[m];
    }
    return current->count;
}
int main()
{
    char str[20];
    while(gets(str),strcmp(str,""))
    {
        insert(str);
    }
    while(gets(str)!=NULL)
    {
        printf("%d\n",search(str));
    }
    return 0;
}
原文:http://blog.csdn.net/lvshubao1314/article/details/45227145