【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());    }}