Big free DSA bundle dropped
A wave of fresh, free study material for interview prep hit timelines — a curated list of essential DSA topics plus 10,000+ pages of programming notes (Java, Python, SQL) and pattern-focused walkthroughs like the running‑state/prefix‑sum approach for LeetCode #1480. The pack focuses on mastering core patterns (arrays, trees, graphs, DP) and invariant thinking rather than blasting problems at random — great for structuring Big Tech LeetCode practice. ( )
GoalKicker hosts a free "Algorithms — Notes for Professionals" PDF compiled from Stack Overflow Documentation and available on its books.goalkicker.com pages. (books.goalkicker.com) The GoalKicker index lists dozens of free programming PDFs across languages and stacks, and a public GitHub mirror shows more than 40 distinct book folders in the collection. (books.goalkicker.com) Flagship titles in the bundle include Java Notes for Professionals (about 900–982 pages), Python Notes for Professionals (roughly 800–856 pages), C++ Notes for Professionals (~708 pages) and JavaScript Notes for Professionals (~490 pages). (goodreads.com) Adding those flagship lengths to the "dozens" of other PDFs listed on the site and GitHub mirror implies the GoalKicker collection represents well over 10,000 pages of programming notes (statement based on listed titles and published page counts). (github.com) DEV author Yash Gandhi published "Running State Pattern — LeetCode #1480: Running Sum of 1D Array" on Mar 30 as part of a LeetCode Patterns series, tagging the post with leetcode, typescript and python. (dev.to) Gandhi frames #1480 as an accumulator/prefix‑sum "running state" pattern that ties loop invariants to prefix sums and Kadane-style reasoning, while GoalKicker's Algorithms notes explicitly list BFS/DFS, trees, tries, graphs and dynamic programming as core topics—both resources therefore reinforce a pattern‑first approach to DSA practice. (dev.to)
