백준 11단계 no.2

import java.io.*;
import java.util.*;

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

        int n = Integer.parseInt(br.readLine());
        int[] arr = new int[n];
        for (int i = 0; i < arr.length; i++) {
            arr[i] = Integer.parseInt(br.readLine());
        }

        Arrays.sort(arr);

        for (int j : arr) {
            bw.write(j + "\n");
        }
        bw.flush();
        bw.close();
    }
}

틀린이유: 아직도 bufferedreader 와 bufferendwriter에 익숙하지 않다