Question: . Question 1 A quantitative trading firm seeks to create a tool for querying the net profit / loss of the firm at any given

. Question 1
A quantitative trading firm seeks to create a tool for querying the net profit/loss of the firm at any given time. The tool processes a list of events, each of which can be classified into one of four categories:
diagram...
1. BUY stock quantity: Signifies the purchase of shares of stock at the market price.
2. SELL stock quantity. Indicates the sale of shares of stock at the market price.
3. CHANGE stock price: Signifies a change in the market price of by amount, which can be either positive or negative.
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4. QUERY: Represents a query for the net profit/loss from the start of trading to the present.
The tool should return a list of numbers corresponding to each QUERY event.
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