Arrays Strings and Collections Fundamentals Questions

Core knowledge of linear data structures and common collection types and the techniques used to manipulate them. Covers arrays and strings operations such as iteration, indexing, in place modification, reversing, rotating, two pointer techniques, sliding window patterns, searching and basic sorting approaches for these containers, and typical interview problems like finding duplicates and subarray or substring problems. Also covers collection types such as lists, sets, dictionaries and hash tables, when to use each, loop constructs and recursion for traversal, and basic time and space complexity reasoning to choose appropriate data structures and algorithms.