Adyen Coding Interview Questions
25 Adyen coding interview problems with full optimal solutions — 11 easy, 11 medium, 3 hard. Every problem ships with multiple approaches (brute-force first, then the optimal), complexity tables for each, company-specific tips on what an Adyen interviewer values, and a FAQ section.
Showing 11 problems of 25
- #8mediumfoundational
8. Maximum Subarray
Find the contiguous subarray with the largest sum and return that sum.
- #9mediumfoundational
9. Group Anagrams
Group strings that are anagrams of each other into the same bucket.
- #10mediumfoundational
10. Top K Frequent Elements
Given an array, return the k most frequent elements.
- #11mediumfoundational
11. Product of Array Except Self
Return an array where each entry is the product of all other entries — no division allowed.
- #12mediumfoundational
12. Longest Consecutive Sequence
Find the length of the longest run of consecutive integers in an unsorted array.
- #13mediumfoundational
13. 3Sum
Find all unique triplets in the array that sum to zero.
- #14mediumfoundational
14. Container With Most Water
Pick two lines forming a container with the x-axis that holds the most water.
- #15mediumfoundational
15. Longest Substring Without Repeating Characters
Find the length of the longest substring without repeating characters.
- #16mediumfoundational
16. Longest Palindromic Substring
Return the longest palindromic substring in the given string.
- #21mediumfoundational
21. Coin Change
Return the fewest coins needed to make an amount, or -1 if impossible.
- #22mediumfoundational
22. LRU Cache
Design a data structure that supports get and put in O(1) with least-recently-used eviction.