HDOJ 1075 （What Are You Talking About）

点击打开链接 http://acm.hdu.edu.cn/showproblem.php?pid=1075

思路：利用字典树+map ，但是也可以直接利用map来写，用string不要用char

注意：这组数据

START

dog aa

END

START

a aa

END

输出：a dog

代码（字典树+map）：

#include <iostream>
#include <cstdio>
#include <cstring>
#include <string>
#include <cstdlib>
#include <map>
using namespace std;
string str1 , str2;
//字典树的结构体
struct node{
    struct node *child[26];
    int num;
};
node *root;
//创建字典树
void Tree_Insert(string str){
    int i , j;
    node *t , *s = root;
    int len = str.size();
    for(i = 0 ; i < len ; i++){
        int id = str[i] - 'a';
        if(s -> child[id] == 0){
            t = new node;
            for(j = 0 ; j < 26 ;j++)
                t -> child[j] = 0;
            t-> num = 0;
            s -> child[id] = t;
        }
        s = s -> child[id];
        s -> num++;     
    }
}
//查找单词
int Tree_search(string str){
    node *t , *s = root;
    int i , j;
    int count;
    int len = str.size();
    for(i = 0 ; i < len ; i++){
        int id = str[i] - 'a';
        if(s -> child[id] == 0){
            count = 0;
            return count;
        }
        else{
            s = s -> child[id];
            count = s->num;
        }
    }

    //以下注意判断是否存在儿子节点，要最后没有儿子节点才能够返回1

    for(i = 0 ; i < 26 ; i++){
        if(s -> child[i]){
            count = 0;
            break;
        }
    }
    if(i == 26)
        count = 1;
    return count;    
}
int main(){
    int i , j;
    root = new node;
    for(i = 0 ; i < 26 ; i++){
        root -> child[i] = 0;
        root -> num = 0;
    }
    map<string , string>m;//创建一个map对象m
    string str;
    cin>>str;
    while(cin>>str1){
        if(str1 == "END")
            break;
        else{
           cin>>str2;
           m[str2] = str1;
           Tree_Insert(str2);
        }
    }
    cin>>str;
    char s[3010];
    int  k;
    getchar();
    while(gets(s)){
        if(strcmp(s , "END") == 0)
            break;
        int len = strlen(s);
        s[len] = ' ';
        string temp = "";
        for(i = 0 ;i <= len ; i++){
             if(s[i] < 'a' || s[i] > 'z'){   
                if(Tree_search(temp))
                    cout<<m[temp];
                if(Tree_search(temp) == 0)
                    cout<<temp;
                if(i != len)
                    cout<<s[i];
                temp = "";
            }
            else
                temp += s[i];
        }
        cout<<endl;
    }
    return 0;
}

代码2（直接map）

#include <iostream>
#include <cstdio>
#include <cstring>
#include <string>
#include <cstdlib>
#include <map>
using namespace std;
string str1 , str2;
int main(){
    int i , j;
    map<string , string>m;
    string str;
    cin>>str;
    while(cin>>str1){
        if(str1 == "END")
            break;
        else{
           cin>>str2;
           m[str2] = str1;
        }
    }
    cin>>str;
    char s[3010];
    int  k;
    getchar();
    while(gets(s)){
        if(strcmp(s , "END") == 0)
            break;
        int len = strlen(s);
        s[len] = ' ';
        string temp ="";
        for(i = 0 ;i <= len ; i++){            
            if(s[i] < 'a' || s[i] > 'z'){
                if(m[temp] != "")
                    cout<<m[temp];
                if(m[temp] == "")
                    cout<<temp;
                if(i != len)
                    cout<<s[i];
                temp = "";
            }
            else
                temp += s[i];
        }
        cout<<endl;
    }
    return 0;
}