pasteProg

//ПЪРВА ЗАДАЧА
package Prog;

import java.util.HashMap;
import java.util.Map;

public class Prog_Main {

    public static void main(String[] args) {
        int arr[] = {4, 2, 7, 7, 7, 2, 2, 2, 7, 3, 6, 1};
        HashMap<Integer, Integer> map = new HashMap();
        for (int i = 0; i < arr.length; i++) {
            if (!map.containsKey(arr[i])) {
                map.put(arr[i], 1);
            } else if (map.containsKey(arr[i])) {
                int count = 1 + map.get(arr[i]);
                map.put(arr[i], count);
            }
        }

        int num = 0;
        int key = 0;
        for (Map.Entry<Integer, Integer> entry : map.entrySet()) {
            if (num < entry.getValue()) {
                num = entry.getValue();
                key = entry.getKey();
            }
        }
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + " ");
        }
        System.out.print(" => "+key + " => " + num + " times");

    }
}
//ВТОРА ЗАДАЧА
package Prog;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {
    public static void getArr(List list, String[] input) {
        for (int i = 0; i < input.length; i++) {
            String str = input[i].replaceAll("[\\D+]", "");
            String[] numbers = str.split("");
            list.add(numbers);
        }
    }

    public static void reverseList(List list, List result) {
        for (int i = list.size() - 1; i >= 0; i--) {
            result.add(list.get(i));
        }

    }

    public static void printResult(List<String[]> result) {
        for (int ind = 0; ind < result.size(); ind++) {
            for (String k : result.get(ind)) {
                System.out.print(k + " ");
            }
        }
    }

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

        String[] input = scan.nextLine().split("\\|");
        List<String[]> list = new ArrayList<>();
        List<String[]> result = new ArrayList<>();

        getArr(list, input);
        reverseList(list, result);
        printResult(result);
    }
}
// ТРЕТА ЗАДАЧА
package Prog;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Main {

    public static void main(String[] args) {

        int arr[] = {34, 4, 2, 49, 3, 25, 2};
        List<Integer> res = new ArrayList<>();
        for (int i = 0; i < arr.length; i++) {
            double val = Math.sqrt(arr[i]);
            if (val == (int) val) {
                res.add(arr[i]);
            }
        }
        Collections.sort(res);
        Collections.reverse(res);
        System.out.println(res);
    }
}