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hdu 1247 Hat’s Words(字典树)

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Hat’s Words

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 9574    Accepted Submission(s): 3421


Problem Description
A hat’s word is a word in the dictionary that is the concatenation of exactly two other words in the dictionary.
You are to find all the hat’s words in a dictionary.
 

Input
Standard input consists of a number of lowercase words, one per line, in alphabetical order. There will be no more than 50,000 words.
Only one case.
 

Output
Your output should contain all the hat’s words, one per line, in alphabetical order.
 

Sample Input
a ahat hat hatword hziee word
 

Sample Output
ahat hatword
 

Author
戴帽子的
 

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题意:判断一个单词能不能有两个单词组成,可以的话就输出。

题解:所有单词建成一颗字典树,单词插入结尾记录单词的个数,查询时直接暴力拆单词判断。


#include<cstring>
#include<algorithm>
#include<cstdio>
#include<iostream>
#include<cstdlib>

#define N 50020

using namespace std;

char s[N][42];

struct Trie {
    int num;
    struct Trie *nxt[26];
    Trie() {
        num=0;
        for(int i=0; i<26; i++) {
            nxt[i]=NULL;
        }
    }
};

void Trie_Inser(Trie *p,char s[]) {
    int i=0;
    Trie *q=p;
    while(s[i]) {
        int nx=s[i]-'a';
        if(q->nxt[nx]==NULL) {
            q->nxt[nx]=new Trie;
        }
        i++;
        q=q->nxt[nx];
    }
    q->num+=1;
}

bool Trie_Serch(Trie *p,char s[],int be,int en) {
    Trie *q=p;
    int i=be;
    while(i<=en) {
        int nx=s[i]-'a';
        if(q->nxt[nx]==NULL)return false;
        q=q->nxt[nx];
        i++;
    }
    if(q->num>0)return true;
    return 0;
}

int main() {
    //freopen("test.in","r",stdin);
    Trie *p=new Trie;
    int id=1;
    while(~scanf("%s",s[id])) {
        Trie_Inser(p,s[id]);
        id++;
    }
    for(int i=1; i<id; i++) {
        int len=strlen(s[i]);
        int be=0;
        if(len<=1)continue;
        for(int en=0; en<len-1; en++) {
            if(Trie_Serch(p,s[i],be,en)&&Trie_Serch(p,s[i],en+1,len-1)) {
                printf("%s\n",s[i]);
                break;
            }
        }
    }
    return 0;
}


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hdu 1247 Hat’s Words(字典树)

原文:http://blog.csdn.net/acm_baihuzi/article/details/46910219

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