Posts

All the articles I've posted.

• LeetCode 494 Target Sum

  24 Jun, 2026

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

• LeetCode 918 Maximum Sum Circular Subarray

  24 Jun, 2026

  Solutions for LeetCode 918, medium, tags: array, dynamic programming, divide and conquer, queue, monotonic queue.

• System Design - How Gossip Protocols Work

  24 Jun, 2026

  How gossip protocols propagate information across distributed systems: epidemic dissemination, SWIM failure detection, push/pull/push-pull strategies, convergence analysis, and real-world implementations in Cassandra, Consul, and Redis Cluster.

• LeetCode 130 Surrounded Regions

  23 Jun, 2026

  Solutions for LeetCode 130, medium, tags: array, depth-first search, breadth-first search, union find, matrix.

• System Design - How Coroutines and Async/Await Work Under the Hood

  23 Jun, 2026

  How coroutines power async/await: the difference between stackful and stackless coroutines, how Python transforms async functions into state machines, how Go's goroutines use stack-copying, and how the event loop ties it all together.

• LeetCode 518 Coin Change II

  23 Jun, 2026

  Solutions for LeetCode 518, medium, tags: array, dynamic programming.