View All num of num See all Photos Amazon.com This employer has taken extra steps to respond to reviews and provide job seekers with accurate company information, photos, and reviews. Interested for your company?Learn More. www.amazon.com Employer Engaged Overview Reviews Salaries Interviews Jobs Photos Benefits 4.4k Reviews 11k Salaries 5.7k Interviews 10k Jobs Follow Add Review or Salary Follow Add Review or Salary Interview Question Software Development Engineering Summer Intern Interview Amazon.com Given a text file, perform a pre-processing step to create a DS; so later when queried for a word, the lookup is very fast. Tags: See more , See less 8 Answer Add Tags Answer Interview Answer 1 Answer ▲ 0 ▼ I built a trie for this question. Interview Candidate on Mar 21, 2013 Add Answers or Comments To comment on this, Sign In or Sign Up.