Posts

All the articles I've posted.

• LeetCode 198 House Robber

  17 May, 2026

  Solutions for LeetCode 198, medium, tags: array, dynamic programming.

• LeetCode 17 Letter Combinations of a Phone Number

  16 May, 2026

  Solutions for LeetCode 17, medium, tags: hash table, string, backtracking.

• LeetCode 54 Spiral Matrix

  16 May, 2026

  Solutions for LeetCode 54, medium, tags: array, matrix, simulation.

• System Design - How the Linux Process Scheduler (CFS) Works

  16 May, 2026

  How Linux's Completely Fair Scheduler (CFS) works: virtual runtime, red-black tree scheduling, nice values, CPU bandwidth control, and source code walkthrough from the kernel's sched/fair.c.

• System Design - How Linux io_uring Works

  15 May, 2026

  How Linux io_uring works: the submission and completion ring buffers, zero-copy I/O without system call overhead, kernel polling mode, and source code walkthrough from the liburing library.

• System Design - How Two-Phase Commit (2PC) Works

  14 May, 2026

  How two-phase commit (2PC) works in distributed databases: the coordinator/participant model, prepare and commit phases, failure handling, recovery via write-ahead logging, and real-world implementations in PostgreSQL, MySQL, and TiDB.