题解 | #明明的随机数#简单去重

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

public class Main {
    public static void main(String[] args) {
        BufferedReader r = new BufferedReader(new InputStreamReader(System.in));
        int n = 0, i = 0, num = 0;
        int[] arr = new int[1001];
        String a;
        StringBuffer ans = new StringBuffer();
        try {
            a = r.readLine();
            n = Integer.parseInt(a);
            while (i < n) {//遍历输入的所有数据
                a = r.readLine();
                num = Integer.parseInt(a);
                arr[num] = 1;//将输入数据以下标的方式保存在数组中，并将其值置为1
                i++;
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        i = 0;
        while (i < arr.length) {//将数组遍历3
            if (arr[i] == 1) {//将输入数据输出，以1作为判断依据
                ans.append(i);
                ans.append("\n");
            }
            i++;
        }
        System.out.print(ans);
    }
}