WRITING
Notes on building and running systems
Engineering write-ups — architecture, security, and the occasional war story.
#recursion · All writing
Tags
01
Climbing Stairs: from exponential recursion to O(1) space
LeetCode 70 is Fibonacci in disguise. Here are the four solutions I actually reach for, why the naive one deserves to time out, and how to recognise the same shape in harder DP problems.Jun 13, 2026 · 6 min read · #00002
Occasional notes on what I'm building
Get an email when I publish a new post — engineering write-ups, no spam. Unsubscribe anytime.