Posts

All the articles I've posted.

• LeetCode 994 Rotting Oranges

  20 May, 2026

  Solutions for LeetCode 994, medium, tags: array, breadth-first search, matrix.

• System Design - How Database Sharding Works

  19 May, 2026

  How database sharding works: partitioning strategies (hash, range, directory), routing mechanisms, resharding challenges, and how real systems (Vitess, TiDB, DynamoDB, CockroachDB) implement it.

• LeetCode 105 Construct Binary Tree from Preorder and Inorder Traversal

  19 May, 2026

  Solutions for LeetCode 105, medium, tags: array, hash table, divide and conquer, tree, binary tree.

• LeetCode 133 Clone Graph

  19 May, 2026

  Solutions for LeetCode 133, medium, tags: hash table, depth-first search, breadth-first search, graph.

• LeetCode 424 Longest Repeating Character Replacement

  18 May, 2026

  Solutions for LeetCode 424, medium, tags: string, sliding window, hash table, binary search.

• LeetCode 2583 Kth Largest Sum in a Binary Tree

  18 May, 2026

  Solutions for LeetCode 2583, medium, tags: tree, breadth-first search, sorting, binary tree.