Short Algorithm Problems

Not every xAI coding round is a long class build. Some give you one short problem with a clean answer, and these turn up anywhere from a phone screen to a final round.

Each problem has a slow answer that works, like trying every case one by one. The fast answer usually depends on one idea. Spend the first few minutes finding it, and talk it through before you write code.

When your code passes, state the complexity and the edge cases you checked. Expect a follow-up on cost or on how the answer changes with the input, like a change in how often the hard case happens. The three problems below are sorted by how often each comes up.

xAIPremium lesson · Coding round

The 3 xAI problems are below.

1. 1A Premium questionCoding · Medium · Frequently asked
2. 2A Premium questionCoding · Medium
3. 3A Premium questionCoding · Medium

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

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