Posts

All the articles I've posted.

• LeetCode 4 Median of Two Sorted Arrays

  26 Jun, 2026

  Solutions for LeetCode 4, hard, tags: array, binary search, divide and conquer.

• LeetCode 752 Open the Lock

  26 Jun, 2026

  Solutions for LeetCode 752, medium, tags: array, hash table, string, breadth-first search.

• LeetCode 841 Keys and Rooms

  25 Jun, 2026

  Solutions for LeetCode 841, medium, tags: depth-first search, breadth-first search, graph.

• LeetCode 547 Number of Provinces

  25 Jun, 2026

  Solutions for LeetCode 547, medium, tags: depth-first search, breadth-first search, union find, graph.

• System Design - How Paxos Consensus Works

  25 Jun, 2026

  How Paxos distributed consensus works: the protocol phases, roles (proposer, acceptor, learner), Multi-Paxos optimization, comparison with Raft, and real-world implementations in Google Chubby, Apache ZooKeeper, and Spanner.

• LeetCode 494 Target Sum

  24 Jun, 2026

  Solutions for LeetCode 494, medium, tags: array, dynamic programming, backtracking.