Calculate Net Profit
JP Morgan Chase● EasyOAProblem statement
A quantitative trading firm aims to develop a tool to track the net profit/loss of the firm at any point in time. This tool processes a list of events, where each event falls into one of four categories:
- BUY stock quantity: Indicates the purchase of
quantityshares ofstockat the market price. - SELL stock quantity: Indicates the sale of
quantityshares ofstockat the market price. - CHANGE stock price: Indicates a change in the market price of
stockbypriceamount, which can be positive or negative. - QUERY: Requests the net profit/loss from the start of trading until the current time.
The tool should return a list of numbers corresponding to each QUERY event.
Function
calculateNetProfit(events: String[]) → long[]
Complete the function calculateNetProfit in the editor.
calculateNetProfit has the following parameter:
String[] events: an array of strings describing the events
Returns long[]: the answers to the "QUERY" events
My deepest, sincere, and boundless gratitude to an amazing friend for all their help. 🩵
Examples
Example 1
events = ["BUY googl 20", "BUY aapl 50", "CHANGE googl 6", "QUERY", "SELL aapl 10", "CHANGE aapl -2", "QUERY"]return = [120, 40]The 20 shares of googl gain 6 each, so the first query returns 120. Selling 10 shares of aapl leaves 40 shares. When aapl's price then falls by 2, the portfolio loses 80, so the second query returns 40.
Constraints
- 1 ≤ events.length ≤ 10^5
- 1 ≤ events[i].length ≤ 21
- For every
SELL stock quantityevent, it is guaranteed that enough shares are owned. - 1 ≤ quantity ≤ 10^3
- The absolute value of a change in the price of any stock at any event will not exceed 10³.