Solve four OA algorithm problems
Company: TikTok
Role: Software Engineer
Category: Coding & Algorithms
Difficulty: hard
Interview Round: Technical Screen
Overview: This multi-part exercise evaluates algorithmic problem-solving across combinatorics and geometry (counting axis-aligned square subgrids), string reordering under adjacency constraints (minimum adjacent swaps to form a palindrome), deterministic grid-walk simulation with teleportation and cycle detection, and prefix-sum based range optimization for arrays, and it belongs to the Coding & Algorithms domain. These problems are commonly asked to assess efficiency under large constraints, correctness in handling edge cases and invariants, and the ability to blend conceptual understanding with practical algorithm design, requiring both conceptual reasoning and applied implementation skills.
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