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Assume we have a function get_book_info(isbn) that takes a string ISBN argument and retrieves a struct/object containing the Title, Author, and Language of a book (each represented as a string) that takes a nontrivial amount of time to run (perhaps because it’s making a call to a database). Write a wrapper function that increases performance by keeping results in memory for the quick lookup. To prevent memory from growing unbounded, we only want to store a maximum of N book records. At any given time, we should be storing the N books that we accessed most recently. Assume that N can be a large number when making decisions about choices of data structure(s) and algorithm(s).

Embedded Software Engineer

Interviewed at Picovoice

2.3★
Jul 14, 2025

Assume we have a function get_book_info(isbn) that takes a string ISBN argument and retrieves a struct/object containing the Title, Author, and Language of a book (each represented as a string) that takes a nontrivial amount of time to run (perhaps because it’s making a call to a database). Write a wrapper function that increases performance by keeping results in memory for the quick lookup. To prevent memory from growing unbounded, we only want to store a maximum of N book records. At any given time, we should be storing the N books that we accessed most recently. Assume that N can be a large number when making decisions about choices of data structure(s) and algorithm(s).

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