Find Anagrams in String/Array

Problem Overview

Given two arrays of strings (or a string and a pattern string), find all anagrams of the target(s) within the source and return their first indices. In the array variant: the second array is the set of targets; for each target string, find all strings in the first array that…

• 3 candidate-reported follow-ups — the exact probes interviewers asked, with the trigger for each
• The rest of the problem statement — full requirements, constraints, and edge cases
• Approach and trade-offs — what passing candidates did, and the mistakes that sink people