$.$ 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.

Training

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