This is your cheat sheet. Every major DSA pattern distilled into copy-paste-ready Python code. Keep this page bookmarked — when you see a problem and recognize the pattern, come here, grab the skeleton, and adapt it. Each template is stripped to its structural core: the loop shape, the pointer movement, the data structure lifecycle. Comments mark the spots where your problem-specific logic goes.
Arrays & Strings
The bread and butter. Most interview problems start here.