Blog posts — page 20

Coding Interview

Jason Yang · 01 Dec, 2025

Maximum Product Subarray (LeetCode 152): why you track max and min together to handle negatives and zeros, and the O(n) dynamic-programming solution.

Tools

Jason Yang · 01 Dec, 2025

Easily download YouTube videos as high-quality MP3s on Ubuntu. Use yt-dlp and FFmpeg to convert audio and embed thumbnails with simple commands.

Tools

Jason Yang · 01 Dec, 2025

Batch trim MP3s on Ubuntu with FFmpeg. Use this simple shell script to cut audio files instantly without re-encoding or quality loss.

Tools

Jason Yang · 01 Dec, 2025

Easily merge two mono audio files into a single stereo track using FFmpeg on Ubuntu. Perfect for syncing dual-mic interviews and podcasts.

Tools

Jason Yang · 01 Dec, 2025

Batch convert video (MKV, MP4, AVI) to MP3 on Ubuntu with a simple FFmpeg shell script — no manual re-encoding, run it once on a whole folder.