Motivation: Color as a “Type System” for Pictures If you have ever looked at a black-and-white cellular automaton that felt like pure static, you are not alone. Many classical diagrams of elementary rules compress rich structure into just two colors. As programmers, we already accept that types expose structure in code that is invisible in raw bytes. In this article, I will argue that well-desig
A few years ago I solved 200 LeetCode problems and still froze on Mediums I hadn't seen. The breakthrough wasn't another hundred problems. It was a different loop. A problem asks for the longest substring with at most K distinct characters. You've solved sliding window before. Maximum sum subarray of size K, done. Longest substring without repeating characters, done. This third one stalls you. Twe