Arrays, Numbers and Recursion

Workday phone screens and campus rounds often start with a short array or number question, from pair sums and digit math to a little recursion. One of them comes up far more than the rest.

Each of these has a first answer that works. The follow-up is about cost, like a sort that could be one pass or a recursion that repeats its own work. Know the faster version and be ready to say why it's faster.

In Java, watch the integer width too. An int can overflow without any error once values grow. Try zero and an empty list before anything big, since those small inputs catch off-by-one bugs fast.

WorkdayPremium lesson · Coding round

The 5 Workday problems are below.

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

+ 2 more in this lesson

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

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