Top Amazon Research Scientist Interview Questions and Answers
This article delves into some of the most common and challenging questions posed during Amazon Research Scientist interviews. We provide in-depth solutions, clear explanations of the underlying concepts, and practical code examples to help you excel in your preparation.
Question: How can you build a dictionary structure that efficiently allows you to search for all valid words which are permutations of a given string?
Suppose you have a dictionary (word list) D and you are given a string S. You need to efficiently find all valid words in D that are permutations (anagrams) of S. The naive approach would be to generate all permutations of S and check each against D, but this is highly inefficient for strings of non-trivial length (as there are \(n!\) permutations for a string of length \(n\)).
