void Arena::moveZombies()
{
	// Move all zombies
	for (int k = m_nZombies - 1; k >= 0; k--)
	{
		Zombie* zp = m_zombies[k];
		zp->move();

		if (m_player != nullptr  &&
			zp->row() == m_player->row() && zp->col() == m_player->col())
			m_player->setDead();

		if (zp->isDead())
		{
			m_history.record(zp->row(), zp->col());
			delete zp;

			// The order of Zombie pointers in the m_zombies array is
			// irrelevant, so it's easiest to move the last pointer to
			// replace the one pointing to the now-deleted zombie.  Since
			// we are traversing the array from last to first, we know this
			// last pointer does not point to a dead zombie.

			m_zombies[k] = m_zombies[m_nZombies - 1];
			m_nZombies--;
		}
	}

	// Another turn has been taken
	m_turns++;
}
int Arena::numberOfZombiesAt(int r, int c) const
{
	int count = 0;
	for (int k = 0; k < m_nZombies; k++)
	{
		Zombie* zp = m_zombies[k];
		if (zp->row() == r  &&  zp->col() == c)
			count++;
	}
	return count;
}