Arrays & Hashing 9/9 Contains Duplicate, Valid Anagram, Two Sum, Group Anagrams, Top K Frequent Elements, Encode and Decode Strings, Product of Array Except Self, Valid Sudoku, Longest Consecutive ...

Scrapes all 150 problems from neetcode.io and saves them as an organized local backup with Markdown files and your own submissions. Then builds a print-ready PDF book using Node.js + Puppeteer.