Posts

All the articles I've posted.

• LeetCode 124 Binary Tree Maximum Path Sum

  28 May, 2026

  Solutions for LeetCode 124, hard, tags: tree, depth-first search, dynamic programming, binary tree.

• LeetCode 973 K Closest Points to Origin

  28 May, 2026

  Solutions for LeetCode 973, medium, tags: array, math, divide and conquer, geometry, sorting, heap, quickselect.

• LeetCode 162 Find Peak Element

  27 May, 2026

  Solutions for LeetCode 162, medium, tags: array, binary search.

• System Design - How MapReduce Works

  27 May, 2026

  How Google's MapReduce programming model works: the map and reduce phases, data shuffling, fault tolerance, locality optimization, and a walkthrough of the execution model with real code examples.

• LeetCode 981 Time Based Key-Value Store

  27 May, 2026

  Solutions for LeetCode 981, medium, tags: hash table, string, binary search, design.

• LeetCode 287 Find the Duplicate Number

  26 May, 2026

  Solutions for LeetCode 287, medium, tags: array, two pointers, binary search, bit manipulation.