Master the most frequently asked algorithms and data structures for frontend interviews. Covers arrays, strings, trees, graphs, linked lists, dynamic programming, and stacks. Curated from the top-asked LeetCode problems at Google, Meta, Amazon, and Apple.
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Start here: O(n) map/set patterns. Two Sum is the #1 asked problem globally.
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Three Sum and longest substring are top-10 asked problems at FAANG.
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Product array and move zeroes test index correctness + invariants.
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Calendar problems = interval mastery. Merge intervals is top-20 asked.
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Boundary conditions are the whole interview.
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Valid parentheses, daily temperatures, and min stack are top-asked stack problems.
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Climbing stairs, buy/sell stock, and max subarray: the classic starter DP/greedy trio.
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Coin change, house robber, and word break: the standard DP interview templates.
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Reverse, cycle detection, and merge: the three linked list patterns that cover 90% of interview questions.
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DOM is a tree. Tree traversal is the most relevant DSA category for frontend engineers.
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Level order traversal, right side view, and BST validation: common tree follow-ups.
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Number of islands, course schedule, and top-K: essential graph + heap patterns.
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Pro-only: Trie, LRU Cache, and design hashmap. Tests data structure design thinking.
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Pro-only hard capstone: the problems that separate good from great.