【链家笔试题】问卷调查

思路
通过Java的TreeSet集合实现去重加排序的效果。

import java.util.Iterator;
import java.util.Scanner;
import java.util.TreeSet;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n=sc.nextInt();
        TreeSet<Integer> set=new TreeSet<>();
        for(int i=0;i<n;i++)
        {
            set.add(sc.nextInt());
        }
        System.out.println(set.size());
        Iterator<Integer> it=set.iterator();

        StringBuilder stringBuilder=new StringBuilder();
        while(it.hasNext())
        {
            stringBuilder.append(it.next()+" ");
        }
        if(stringBuilder.length()>1)
            stringBuilder.deleteCharAt(stringBuilder.length()-1);
        System.out.println(stringBuilder.toString());
    }
}