This is the third edition of Competitive Programming book. This is the larger version with hard cover. It is much heavier. This CP3 has been superseded by the newer CP4 that is now split into two books: https://www.lulu.com/en/gb/shop/suhendry-effendy-and-felix-halim-and-steven-halim/competitive-programming-4-book-1/paperback/product-1q2pjn4n.html and https://www.lulu.com/en/gb/shop/suhendry-effendy-and-felix-halim-and-steven-halim/competitive-programming-4-book-2/paperback/product-5j9e26.html