Robinhood Order Book
Also known as: Order Book with Price-Time Priority
Robinhood Order Book (Part 1) Store limit orders and query best bid/ask. DO NOT match orders in Part 1. add_limit_order(id, side, price, qty) -> str (fills, or "" if none) get_best_bid() -> str ("null" or price) get_best_ask() -> str ("null" or price)
Implement an order book with limit/market orders, price-time priority matching, partial fills, and cancellation. Outputs are deterministic and easy to audit.
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