Master every data structure for coding interviews. Build hash maps, heaps, tries from scratch. Learn when to use which structure.
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Master fundamental array and string techniques that form the backbone of most coding interviews.
Understand hash tables inside and out — from building one from scratch to solving classic interview patterns.
Master linked list manipulation — from basic operations to advanced techniques like fast/slow pointers and in-place reversal.
Master stack and queue patterns including monotonic stacks, deques, and expression evaluation.
Master binary trees, BSTs, traversals, and classic tree interview problems from LCA to serialization.
Build heaps from scratch, then solve Top K, Merge K, Median Stream, and Task Scheduler problems.
Master graph representations, traversals, cycle detection, shortest paths, and union-find for interview success.
Build tries from scratch, solve word search and autocomplete, then master segment trees, Fenwick trees, and DS selection strategy.