Today I have solved the problem in javascript

 You run an e-commerce website and want to record the last N order ids in a log. Implement a data structure to accomplish this, with the following API:record(order_id): adds the order_id to the log get_last(i): gets the ith last element from the log. i is guaranteed to be smaller than or equal to N. You should be as efficient with time and space as possible.




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