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Sliding windows, two-pointer techniques, and string manipulation.
Given an array of integers nums and an integer target , return indices of the two numbers that add up to target . Download Hint: Use a single pass hash map (O(n) time).
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, which covers algorithms, data structures, and design questions. Full texts and summaries are often shared on academic sites like ResearchGate : Author of Coding Interviews: Questions, Analysis & Solutions , available for borrowing and streaming via Internet Archive. Free Resource Collections # for null nodes).
Serialize and deserialize a binary tree. Design an algorithm to convert a tree to a string and back. Download Hint: Use pre-order DFS with a delimiter (e.g., # for null nodes).