题解 | #明明的随机数#

import java.util.*;

// 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) {
        Scanner in = new Scanner(System.in);
        //N
        int num = in.nextInt();

        StringBuffer sb = new StringBuffer();
        List<Integer> list = new ArrayList<>();

        for (int i = 0; i < num; i++) {
            list.add(in.nextInt());
        }
        Collections.sort(list);
        //去重
        LinkedHashSet<Integer> set = new LinkedHashSet<>(list);
        for (Integer number : set) {
            System.out.println(number);
        }
    }
}

1. list排序：Collections.sort(list); 升序
2. list去重：LinkedHashSet<Integer> set = new LinkedHashSet<>(list);
3. set遍历

for(Integer number : set){

}