Coding Interview
Jason Yang · 31 Mar, 2026
Longest Substring Without Repeating Characters (LeetCode 3): the sliding-window O(n) approach, and why the int[128] version can jump the left pointer instead of stepping — with interactive visuals.
Coding Interview
Jason Yang · 31 Mar, 2026
Valid Palindrome (LeetCode 125): the two-pointer O(n) check that skips non-alphanumerics in place, why it beats building a cleaned string, and the edge cases.
Coding Interview
Jason Yang · 30 Mar, 2026
Longest Consecutive Sequence (LeetCode 128): the hash-set O(n) trick that only counts from sequence starts, with an interactive step-by-step visual.
Tools
Jason Yang · 30 Mar, 2026
Migrate from SecureCRT to Ghostty: SSH config, key-based auth, and shell scripts for a developer-friendly SSH workflow with clean log management.
Cloud & DevOps
Jason Yang · 29 Mar, 2026
Struggling with CORS errors in GCP? How CORS actually works across GCS, API Gateway, and Signed URLs, with practical examples and debugging tips.
