package com.company;

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


class Pair<T,M>{
    private T first;
    private M second;
    final T getFirst(){
        return first;
    }
    final M getSecond(){
        return second;
    }
    final void setFirst(T m){
        this.first=m;
    }
    final void setSecond(M i){
        this.second=i;
    }
    protected Pair(){}
    public Pair(T max,M index){
        this.first=max;
        this.second=index;
    }
    public static <T,M>  Pair make_pair(T max,M index){
        return new Pair<T,M>(max,index);
    }
    final void show(){
        System.out.print(first+" ");
        System.out.print(second+" ");
    }

}


class Bag {
    private final ArrayList<Object> mas = new ArrayList<>();

   protected Bag() {}

    public Bag(int n) {
        for (int i = 0; i < n; i++) {
            mas.add(i, null);
        }
    }

    public void add(Object num) {
        int count = -1;
        boolean flag = false;
        int r = (int) Math.round(Math.random() * (mas.size() - 1));
        while (!flag) {
            for (int k = 0; k < mas.size(); k++) {
                if (mas.get(k) == null) {
                    if(r == k) {
                        mas.set(r, num);
                        System.out.println("Предмет " + mas.get(k) + " добавлен в мешок");
                        flag = true;
                        break;
                    }
                } else  count++;
            }
            r = (int) Math.round(Math.random() * (mas.size() - 1));
            if (mas.size() - 1 == count) {
                System.out.println("Мешок полон");
                break;
            }
        }
    }

    public Object remove() {
        boolean flag = false;
        Object tmp=null;
        if (mas.size() == 0) return tmp;
        while (!flag) {
            int r = (int) Math.round(Math.random() * (mas.size() - 1));
            for (int k = 0; k < mas.size(); k++) {
                if (mas.get(k) != null && r == k) {
                    tmp = mas.get(k);
                    System.out.println("Предмет " + mas.get(k) + " удален");
                    mas.set(k,null);
                    flag = true;
                    break;
                }
            }
        }
        return tmp;
    }

    public final Object retElem(int i) {
        return mas.get(i);
    }

    public final int retSize() {
        return mas.size();
    }

    public void show() {
        for (Object i : mas) {
            System.out.print(i + " ");
        }
        System.out.println();
    }
}

    class PairBag extends Bag {

     private  ArrayList<Pair> pmas = new ArrayList<>();

      public  PairBag(int n) {

            for (int i = 0; i < n; i++) {
                pmas.add(i, null);
            }
        }

       public <T, M> void addpair(T first, M second) {
            int count = -1;
            boolean flag = false;
            Pair<T, M> pair1 = new Pair<>(first, second);
            int r = (int) Math.round(Math.random() * (pmas.size() - 1));
            while (!flag) {
                for (int k = 0; k < pmas.size(); k++) {
                    if (pmas.get(k) == null) {
                        if(r==k) {
                            pmas.set(r, pair1);
                            System.out.println("Пара значений ");
                            pmas.get(k).show();
                            System.out.print("добавлена в мешок");
                            System.out.println();
                            flag = true;
                            break;
                        }
                    } else count++;
                }
                r = (int) Math.round(Math.random() * (pmas.size() - 1));
                if (pmas.size() - 1 == count) {
                    System.out.println("Мешок полон");
                    break;
                }
            }
        }

        public Pair delpair() {
            boolean flag = false;
            Pair tmp = new Pair();
            if (pmas.size() == 0) return tmp;
            while (!flag) {
                int R = (int) Math.round(Math.random() * (pmas.size() - 1));
                for (int k = 0; k < pmas.size(); k++) {
                    if (pmas.get(k) != null && R == k) {
                        tmp = pmas.get(k);
                        System.out.println("Пара значений ");
                        pmas.get(k).show();
                        System.out.print(" удалена");
                        pmas.remove(k);
                        flag = true;
                        break;
                    }
                }
            }
            return tmp;
        }

        @Override
        public void show() {
            for (int i = 0; i < pmas.size(); i++) {
                if (pmas.get(i) != null) {
                    pmas.get(i).show();
                    System.out.print(" ");
                } else System.out.print(pmas.get(i) + " ");
            }
            System.out.println();
        }
    }
class GPairBag<T> extends PairBag{

    GPairBag(int n){
        super(n);
    }

    @Override
    public <T, M> void addpair(T first, M second) {

        if(second.getClass()==first.getClass())
        super.addpair(first, second);
        else System.out.println("Типы элементов пары не равны");
    }

}
 abstract class HashFunction<K>{
    abstract int hash(K s);
    HashFunction(int strings,int columns){

    }
 }
 class Hashtable<K,T>{
    Vector<List<T>> table;
    Hashtable(int strings,int columns,HashFunction<K> hash){

    }
 }

 class Dlist<T1,T2>{

     ArrayList<T1> value;
     ArrayList<ArrayList<T2>> val;

     Dlist() {
         value = new ArrayList<>(20);
         val = new ArrayList<>(20);
     }
         Dlist(int n) {
             value = new ArrayList<>(n);
             val = new ArrayList<>(n);

         }
         public void add(T1 num1,ArrayList<T2> num2){
            ArrayList<T2> g = new ArrayList<>();
            value.add(num1);
            val.add(num2);
         }
         public void del(int i){
         value.remove(i);
         val.remove(i);
         }
         public void show(int i){
             System.out.println("Значение: "+value.get(i));
             System.out.println("Соответсвующие значения"+val.get(i));
         }
     }
    public class Main {

        public static void main(String[] args) {

            com.company.Pair.make_pair(5, "s");
            System.out.println();
            Bag bag = new Bag(5);
            bag.add(5);
            bag.add(1);
            bag.add(52);
            bag.add(-6);
            bag.add(3);
            bag.add(3);
            bag.add(4);
            bag.add(8);
            System.out.println(bag.retSize());
            System.out.println();
            System.out.println(bag.retElem(1));
            System.out.println();
            bag.show();
            bag.remove();
            bag.show();
            bag.remove();
            bag.show();
            bag.remove();
            bag.show();


            PairBag pairbag = new PairBag(5);
            pairbag.addpair(7, "cats");
            pairbag.addpair(5, "dogs");
            pairbag.addpair(10, "parrots");
            pairbag.addpair(2, "bears");
            pairbag.addpair(1, "tiger");
            pairbag.show();




        }
    }