uva 10391 - Compound Words

简介:

 

      判断一个单词是不是组合词,题目中说是不同的单词,但是如果加不同判断就会WA……所以直接无视就好了

 

     一共最多有120000的单词,这种题有两个思路,1是合成词,2是拆分词。

 

     合成词的复杂度是n^2果断超时

     拆分词是n*m(m为平均长度),因为m未知,所以抱着试一试的想法,用map水了一下,就过了,120ms,可见m的长度并不大

 

/*
author:jxy
lang:C/C++
university:China,Xidian University
**If you need to reprint,please indicate the source**
*/
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <string>
#include <map>
#define INF 1E9
using namespace std;
map<string,bool> hash;
string s[150000];
int main()
{
    int i,j;
    int cnt=0;
    hash.clear();
    while(cin>>s[cnt])
    {
        hash[s[cnt]]=1;
        cnt++;
    }
    string a,b;
    for(i=0;i<cnt;i++)
     for(j=0;j<s[i].size()-1;j++)
     {
        a=s[i].substr(0,j+1);
        if(!hash[a])continue;
        b=s[i].substr(j+1);
        if(!hash[b])continue;
        cout<<s[i]<<endl;
        break;
     }
     return 0;
}


 

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