Java 代码

import java.util.Scanner;

public class Main
{
    public static void main(String[] args)
    {
        Scanner cin = new Scanner(System.in);

        int n = cin.nextInt();

        int ci = 0;
        int co = 0;

        for (int i = 0; i < n; i ++)
        {
            int k = cin.nextInt();
            if ( k >= 10 && k <= 20)
                ci += 1;
            else 
                co += 1;
        }

        System.out.println (ci + " in");
        System.out.println (co + " out");
    }
}