Meta Coding Interview Questions
32 Meta coding interview problems with full optimal solutions — 5 easy, 23 medium, 4 hard. Every problem ships with multiple approaches (brute-force first, then the optimal), complexity tables for each, company-specific tips on what an Meta interviewer values, and a FAQ section.
Showing 4 problems of 32
- #25hardfoundational
25. Serialize and Deserialize Binary Tree
Convert a binary tree to a string and back — Meta's news-feed comment-thread storage serializes hierarchical tree structures to bytes for transmission and reconstruction at billion-user scale every day.
- #26hardfoundational
26. Remove Invalid Parentheses
Generate all minimum-removal results to make parentheses valid — Meta's search query parser and structured-message sanitizer use exactly this BFS enumeration to recover gracefully from malformed user input at scale.
- #29hardfoundational
29. Sliding Window Maximum
Track the maximum value in a moving window — Meta's real-time engagement analytics and feed-ranking score smoothing rely on this monotonic deque pattern to compute rolling metrics over billions of events per day.
- #30hardfoundational
30. Word Search II
Find all dictionary words on a 2D character board — Meta's AR text-recognition and content-moderation grid scanners use trie-backed DFS to match thousands of patterns simultaneously without redundant board traversals.
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