codeforces 499B Lecture

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本文介绍了一种算法，用于解决记录快速进行的讲座时如何选择两种语言中较短单词的问题。通过预先建立两种语言之间的对应关系，可以高效地确定记录每个单词的最佳形式。

题目链接

You have a new professor of graph theory and he speaks very quickly. You come up with the following plan to keep up with his lecture and make notes.

You know two languages, and the professor is giving the lecture in the first one. The words in both languages consist of lowercase English characters, each language consists of several words. For each language, all words are distinct, i.e. they are spelled differently. Moreover, the words of these languages have a one-to-one correspondence, that is, for each word in each language, there exists exactly one word in the other language having has the same meaning.

You can write down every word the professor says in either the first language or the second language. Of course, during the lecture you write down each word in the language in which the word is shorter. In case of equal lengths of the corresponding words you prefer the word of the first language.

You are given the text of the lecture the professor is going to read. Find out how the lecture will be recorded in your notes.

Input

The first line contains two integers, n and m (1 ≤ n ≤ 3000, 1 ≤ m ≤ 3000) — the number of words in the professor's lecture and the number of words in each of these languages.

The following m lines contain the words. The i-th line contains two strings ai, bi meaning that the word ai belongs to the first language, the word bi belongs to the second language, and these two words have the same meaning. It is guaranteed that no word occurs in both languages, and each word occurs in its language exactly once.

The next line contains n space-separated strings c1, c2, ..., cn — the text of the lecture. It is guaranteed that each of the strings ci belongs to the set of strings {a1, a2, ... am}.

All the strings in the input are non-empty, each consisting of no more than 10 lowercase English letters.

Output

Output exactly n words: how you will record the lecture in your notebook. Output the words of the lecture in the same order as in the input.

        Examples
      
          input
        
4 3
codeforces codesecrof
contest round
letter message
codeforces contest letter contest

          output
        
codeforces round letter round

          input
        
5 3
joll wuqrd
euzf un
hbnyiyc rsoqqveh
hbnyiyc joll joll euzf joll

          output
        
hbnyiyc joll joll un joll

题意：m对，左右两边是映射关系，求n个单词的笔记（左右意思相同，让求最短的单词）。

#include<stdio.h>
#include<string.h>
#include<map>
#include<string>
#include<iostream>
using namespace std;
int main()
{
    int n,m;
    map<string,string>ff;
    scanf("%d%d",&n,&m);
    string a,b;
    for(int i=0; i<m; i++)
    {
        cin>>a>>b;
        ff[a]=b;
    }
    string x;
    for(int i=0; i<n; i++)
    {
        cin>>x;
        if(i==0)
        {
            if(x.size()<=ff[x].size())
                cout<<x;
            else
                cout<<ff[x];
        }
        else
        {
            if(x.size()<=ff[x].size())
                cout<<' '<<x;
            else
                cout<<' '<<ff[x];
        }
    }
    printf("\n");
    return 0;
}