ProgrammingExercise250321

import java.util.ArrayList;
import java.util.Scanner;
import java.util.Collections;

public class Programming_2_250321 {
    public static void main(String[] args) {
        ArrayList<Integer> list = new ArrayList<>();
        Scanner sc = new Scanner(System.in);
        System.out.println("Please, enter the length of the list: ");
        int l = sc.nextInt();
        System.out.println("Please, enter the elements of the list");
        for (int i = 0; i < l; i++) {
            int num = sc.nextInt();
            list.add(num);
        }
        System.out.println("Your list is: " + list);

        ArrayList<Integer> result = new ArrayList<>();

        for (int i = 0; i < list.size(); i++) {
            double sqrt = Math.sqrt(list.get(i));
            if(sqrt - Math.floor(sqrt) == 0){
                result.add(list.get(i));
            }
        }

        Collections.sort(result, Collections.reverseOrder());
        System.out.println(result);

    }
}