【JAVA】java，我来了

import java.util.Arrays;
import java.util.Scanner;


public class Main {
    
    public static void main(String[] args){
        Scanner cin = new Scanner(System.in);
        
        final int maxn = 101;
        
        int[] a = new int [maxn];
        
        int n = cin.nextInt();
        
        for(int i = 0 ; i < n ; i ++) a[i] = cin.nextInt();
        
        Arrays.sort(a,0,n);
        
        int ans = 1;
        
        for(int i = 1 ; i < n ; i ++){
            if( a[i] != a[i-1]){
                ans++;
            }
        }
        
        System.out.println(ans);
        
        System.out.print(a[0]);
        
        for(int i = 1 ; i < n ; i ++){
            if( a[i] != a[i-1]){
                System.out.print(" "+a[i]);
            }
        }
        
        cin.close();
    }
    
}