题解 | #明明的随机数#

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        String str;
        StringBuilder sb = new StringBuilder();
        boolean[] stu = new boolean[1001];
        while ((str = bf.readLine()) != null) {
            int n = Integer.parseInt(str);
            for (int i = 0; i < n; i++)
                stu[Integer.parseInt(bf.readLine())] = true;
            for (int i = 0; i < 1001; i++)
                if (stu[i])
                    sb.append(i).append("\n");
            bf.close();
            break;
        }
        sb.deleteCharAt(sb.length() - 1);
        System.out.println(sb.toString());

    }
}