Posts
All the articles I've posted.
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System Design - How WebAuthn Passkeys Work
A beginner-friendly walkthrough of passkey registration and sign-in, including WebAuthn challenges, public-key signatures, phishing resistance, and device sync.
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LeetCode 2602 Minimum Operations to Make All Array Elements Equal
Solutions for LeetCode 2602, medium, tags: array, binary search, sorting, prefix sum.
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LeetCode 2730 Find the Longest Semi-Repetitive Substring
Solutions for LeetCode 2730, medium, tags: string, sliding window, two pointers.
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System Design - How Apache Iceberg Works
A beginner-friendly walkthrough of Apache Iceberg's catalog, metadata, snapshots, manifests, file pruning, commits, and the trade-offs of building reliable tables on object storage.
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System Design - How TiDB Index Lookup Pushdown Works
A source-code walkthrough of TiDB's double-read IndexLookUp plan, how TiDB and TiKV cooperate to push local row lookups down, and the policy, hint, and affinity settings that control it.
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LeetCode 3066 Minimum Operations to Exceed Threshold Value II
A min-heap simulation that repeatedly combines the two smallest values, with overflow-safe implementations in four languages.