数据结构 － trie

#include <cstring>
#include <iostream>
#include <map>
#include <cstdio>
using namespace std;
class Trie{
private :
    map<char,Trie *> * root;
    pair<bool,int> info;
    inline Trie * makeNext(char c){
        if(root == NULL){
            root = new map<char ,Trie * >;
        }
        map<char, Trie *>::iterator it  = root->find(c);
        Trie * in ;
        if( it ==  root->end()){
            in = new Trie();
            root->insert( pair<char , Trie * >(c,in));
        }else{
            in = it->second;
        }
        info.second ++ ;
        return in;
    }
    inline void makeEnd(){
        info.second ++ ;
        info.first = true;
    }
    inline Trie * getChild(char c){
        //该节点后面什么都没有了
        if( root == NULL ){
            return NULL;
        }
        map<char, Trie *>::iterator it  = root->find(c);
        if(it == root->end()){
            //有兄弟节点，但是没有这个后续
            return NULL;
        }
        return it->second;
    }
    void destory(){
        if(root != NULL){
            for(map<char ,Trie *> :: iterator it = root->begin() ; it!=root->end() ; ++ it ){
                it->second->destory();
            }
            delete root;
        }
    }
public :
    static pair<bool,int> None ;
    Trie(){
        root = NULL;
        info = pair<bool,int>(false,0);
    }
    ~Trie(){
        destory();
    }
    void addStr(char * str){
        int len = strlen(str);
        Trie * nowRoot = this;
        while( (*str)!=''){
            nowRoot = nowRoot->makeNext(*str);
            ++str;
        }
        nowRoot->makeEnd();
    }

    pair<bool,int> findStr(char * str){
        Trie * nowRoot = this;
        while((*str)!=''){
            nowRoot = nowRoot->getChild(*str);
            if( nowRoot == NULL){
                return None;
            }
            str++;
        }
        return nowRoot -> info;
    }
};
pair<bool,int> Trie :: None = pair<bool,int>(false,-1);
int main(){
    Trie * a = new Trie();
    a->addStr("abcdfg");
    a->addStr("abcd");
    a->addStr("abc");
    a->addStr("ab");
    cout<<"stop "<<endl;
    pair <bool,int> ans = a->findStr("abc");
    cout<< ans.first << " " << ans.second<<endl;
    delete a;
    return 0;
}