백준 4344 자바 성공코드

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
 
public class Main {
    
    public static void main(String[] args)  {
        
        Scanner scanner = new Scanner(System.in);
 
        int num=scanner.nextInt();
        double[] result = new double[num];
        List mid = new ArrayList<>();
        int mmid;
        int cnt=0;
    
        for(int j=0;j<num;j++) {
            int arr=scanner.nextInt();
            int k= arr;
            
            for(int i=0;i<arr;i++) {
            
            mmid=scanner.nextInt();
            
            mid.add(mmid);    
            
            result[j] += mmid;
            
            }
            result[j] /= k; 
 
            for(int k1=0;k1<mid.size();k1++) {
                
                if((int)result[j] <((int)mid.get(k1)))
                        cnt++;
                
            
                
            }
            
            mid.clear();
            result[j]= (cnt/(double)k)*100;
            
            cnt=0;
        }
        
        for(int j=0;j<num;j++) {
            System.out.printf("%.3f",result[j]);
            System.out.println("%");
            }
        
    
    
        
    }
    
    
}