The Forgetful Machine

A medium Python interview practice problem on DataDriven. Write and execute real python code with instant grading.

Domain

Python

Difficulty

medium

Seniority

L5

Problem

Implement LRUCache(capacity) with get(key) returning the value or -1 if missing, and put(key, value) that inserts/updates and evicts the least-recently-used entry when capacity is exceeded. Also implement LRUCache_driver(capacity, ops) which runs a sequence of ops (each ['get', k] or ['put', k, v]) against an LRUCache(capacity) and returns the list of get() return values, in order.

Summary

It remembers everything, until it does not.

Practice This Problem

Solve this Python problem with real code execution. DataDriven runs your Python code in a real environment and grades it automatically.