Caches and Stores in Levels

Some xAI coding rounds give you one class and a spec split into levels. You finish level one, and the next level opens. The online assessment usually uses this format, and a few live rounds use it too. The classes are the kind you'd find in a backend, stores and caches with a tight cost target per call.

Each test case runs a list of calls against your class and checks every return value. Get one level passing before you start the next.

Each new level adds something small, like a timestamp or a new kind of query. If your level one layout already has a place for it, the change takes a few lines. If it doesn't, you end up rewriting with the clock running. So spend the first few minutes on the data layout and ask yourself what a later level could need. The three classes below are sorted with the most common first.

xAIPremium lesson · Coding round

The 3 xAI problems are below.

1. 1A Premium questionCoding · Medium · Signature problem
2. 2A Premium questionCoding · Medium · Frequently asked
3. 3A Premium questionCoding · Hard

Each with hints, the follow-up and a tested solution.

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