Zadacha3

3. Числа квадрати

import java.util.*;

public class Zadachki {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String [] input = scan.nextLine().split(" ");
        int arr[] = new int[input.length];
        for (int i = 0; i < input.length; i++) {
            arr[i] = Integer.parseInt(input[i]);
        }
        HashSet set = new HashSet<Integer>();

        for(int k:arr){
            double value = Math.sqrt(k);
            if (value == (int) value) {
                set.add(k);
            }
        }
        List<Integer> result = new ArrayList<>(set);
        Collections.sort(result);
        Collections.reverse(result);
        System.out.println(result);
    }
}