Agrega y quita dinamicamente

#include<iostream>
#include<conio.h>
using namespace std;
using namespace System;
struct Movil {
    int x;
    int y;
    int vx;
    int vy;
    int color;
};

int ce=4;
Movil *moviles=new Movil[ce];
void cargaMoviles()
{
    Random r;
    Movil tmp;
    for (int i = 0; i < ce; i++)
    { //cargando los atributos de un movil
        tmp.x= r.Next(8);
        tmp.y= r.Next(60);
        tmp.vx = 1 + r.Next(3);
        tmp.vy = 1 + r.Next(3);
        tmp.color = r.Next(16);
        //agregamos el movil al vector
        moviles[i]=tmp;
    }
}
void gotoXY(int x, int y)
{
    Console::SetCursorPosition(y, x);
}
void muestraMoviles(Movil *m)
{
    for (int i = 0; i < ce; i++)
    {
        gotoXY(m[i].x, m[i].y);
        Console::ForegroundColor = ConsoleColor(m[i].color);
        cout << "X";
    }
}

Movil * agregaMovil(Movil *m)
{
    Movil *vtmp = new Movil[ce + 1];
    for (int i = 0; i < ce; i++)
    {
        vtmp[i] = m[i];
    }
    delete[] m;
    Random r;
    Movil tmp;
    //cargando los atributos de un movil
        tmp.x = r.Next(8);
        tmp.y = r.Next(60);
        tmp.vx = 1 + r.Next(3);
        tmp.vy = 1 + r.Next(3);
        tmp.color = r.Next(16);
        //agrega el movil al vector
        vtmp[ce] = tmp;
        ce++;
        return vtmp;
}

Movil * quitaMovil(Movil *m)
{
    Movil *vtmp = new Movil[ce-1];
    for (int i = 0; i < ce-1; i++)
    {
        vtmp[i] = m[i];
    }
    ce--;
    return vtmp;
}

void borraMoviles(Movil *m)
{
    for (int i = 0; i < ce; i++)
    {
        gotoXY(m[i].x, m[i].y);
        cout << " ";

    }
}
void main()
{
    int opt;
    Console::CursorVisible = false;
    cargaMoviles();
    Movil *vector;
    vector = moviles;
    muestraMoviles(vector);
    while (true)
    {

        gotoXY(20, 5); cout << "Cantidad : " << ce;
        if (kbhit())
        { opt=getch();
            if (opt == 72) {
                vector = agregaMovil(vector);
                system("cls");
            }
            if (opt == 2) {
                vector = quitaMovil(vector);
                system("cls");
            }
        }
        //borras
        borraMoviles(vector);
        //mueves
        for (int i = 0; i < ce; i++)
        {
            if (vector[i].y < 6 || vector[i].y>55) vector[i].vy = vector[i].vy*-1;
            {
                vector[i].y= vector[i].y+ vector[i].vy;
            }

        }
        muestraMoviles(vector);
        _sleep(100);
    }
    system("pause>NULL");
}