[JAVA] 백준 11728: 배열 합치기

문제

실버 5
https://www.acmicpc.net/problem/11728

풀이

package Baekjoon;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.StringTokenizer;

public class S5_11728 {

  public static void main(String[] args) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

    StringTokenizer st = new StringTokenizer(br.readLine());
    int n = Integer.parseInt(st.nextToken());
    int m = Integer.parseInt(st.nextToken());
    ArrayList<Integer> list = new ArrayList<>();

    st = new StringTokenizer(br.readLine());
    for (int i = 0; i < n; i++) {
      list.add(Integer.parseInt(st.nextToken()));
    }

    st = new StringTokenizer(br.readLine());
    for (int i = 0; i < m; i++) {
      list.add(Integer.parseInt(st.nextToken()));
    }
    Collections.sort(list);

    for (int l : list) {
      bw.write(l + " ");
    }
    bw.flush();
    bw.close();
    br.close();
  }
}

각각 입력받아서 하나의 ArrayList에 바로 추가했다. 배열 크기가 1,000,000개까지 가능해서 BufferedWriter로 처리했다. bw.flush와 bw.close는 반드시 해줘야 한다!

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추가

BufferedReader, BufferedWriter를 활용한 빠른 입출력
https://coding-factory.tistory.com/251