Algorithm Problems in the Test

Not every Adyen assessment is a Java project. In one version you open HackerRank and get two medium algorithm problems with about an hour for the pair. Write them in Java if you can. That matches the practical version, and the code may come back in the live round, so keep it as tidy as production code even with the timer running.

Three problems from this version are worked below. One is a search over combinations told in payment terms, and the other two look like math puzzles. Each of those comes down to a much smaller rule than the statement suggests. Work out that rule on paper first. Brute force times out on the hidden tests.

The Adyen angle

The live round often opens on the code you submitted here. Adyen interviewers pull up your assessment solution and ask about its complexity or whether a better structure exists. If a brute force only just passed the visible tests, expect questions about it. Put a short comment above the loop explaining how you got the rule. Use 64-bit types wherever a sum or a count can grow, because Java's int overflows silently at these input sizes. That way the review is about choices you already made and can explain.

AdyenPremium lesson · Coding round

The 3 Adyen 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.

Get the Adyen questions

$49 a year · all 100 companies · cancel anytime

From 20,000+ candidate reports, forum threads behind logins and write-ups in Chinese.

Read a free Adyen lesson firstAlready a member? Sign in