백준 자바 5597 1차원배열(과제안내신분)

https://www.acmicpc.net/problem/5597

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int[] arr = new int[31];

        for (int i = 1; i < 29; i++) {
            int success = Integer.parseInt(br.readLine());
            arr[success] = 1;
        }

        for(int i=1; i<arr.length; i++) {
            if(arr[i]!=1)
                System.out.print(i + " ");
        }

    }

}