def calculate_profit_loss_updated(events):
    holdings = {}  # Stores the quantity and total cost of each stock
    market_prices = {}  # Stores the current market price of each stock
    profits = []  # Stores the profits for each QUERY event

    for event in events:
        details = event.split()
        action = details[0]
        stock = details[1] if len(details) > 1 else None

        if action == "BUY":
            quantity = int(details[2])
            # Initialize stock in holdings and market_prices if not present
            if stock not in holdings:
                holdings[stock] = [0, 0]  # [quantity, total cost]
                market_prices[stock] = 0
            # Update holdings
            holdings[stock][0] += quantity
            holdings[stock][1] += quantity * market_prices[stock]

        elif action == "SELL":
            quantity = int(details[2])
            # Calculate profit/loss from selling
            sell_value = quantity * market_prices[stock]
            original_cost = (holdings[stock][1] / holdings[stock][0]) * quantity
            # Update holdings
            holdings[stock][0] -= quantity
            holdings[stock][1] -= original_cost

        elif action == "CHANGE":
            price_change = int(details[2])
            # Update market price
            market_prices[stock] += price_change

        elif action == "QUERY":
            # Calculate current net profit/loss
            current_profit = 0
            for stock, (quantity, total_cost) in holdings.items():
                current_value = quantity * market_prices[stock]
                current_profit += current_value - total_cost
            profits.append(current_profit)

    return profits