LeetArxiv: LeetCode for Arxiv Papers - Hands-on Coding Guides for Research

LeetArxiv offers weekly, step-by-step coding guides based on Arxiv papers, targeting programmers transitioning to research careers. A case study focuses on implementing the AAN Discrete Cosine Transform (DCT) from a 1981 paper. The guide provides a C implementation (easily adaptable to other languages) detailing the DCT-II equation and the AAN optimizations: reducing costly cosine calculations, exploiting symmetry, using precomputed constants, and enabling parallelism. The walkthrough covers the algorithm's flowgraph and code, making complex research accessible through practical coding exercises.