백준 17219번 비밀번호 찾기(java)

1.문제

https://www.acmicpc.net/problem/17219

2.풀이

hashmap을 사용했다.

3.코드

package com.example.baekjoon;

import java.io.*;
import java.util.HashMap;
import java.util.StringTokenizer;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        StringTokenizer st = new StringTokenizer(br.readLine());

        int n = Integer.parseInt(st.nextToken());
        int m = Integer.parseInt(st.nextToken());

        HashMap<String, String> hash = new HashMap<>();
        
        for (int i = 0; i < n; i++) {
            st = new StringTokenizer(br.readLine());
            String site = st.nextToken();
            String password = st.nextToken();
            hash.put(site, password);
        }

        for (int i = 0; i < m; i++) {
            sb.append(hash.get(br.readLine())).append("\n");
        }

        System.out.println(sb.toString());
    }
}