void market::updateMedian(int ID, int price) {
	if (lowerMedian[ID].empty()) {
		lowerMedian[ID].push(price);
	}
	else if (price < lowerMedian[ID].top()) {
		lowerMedian[ID].push(price);
	}
	else {
		upperMedian[ID].push(price);
	}

	int diff = static_cast<int>(upperMedian[ID].size()) - static_cast<int>(lowerMedian[ID].size());

	if ( diff < -1) {
		int temp = lowerMedian[ID].top();
		lowerMedian[ID].pop();
		upperMedian[ID].push(temp);
	}
	else if (diff > 1) {
		int temp = upperMedian[ID].top();
		upperMedian[ID].pop();
		lowerMedian[ID].push(temp);
	}
}