The article is in Chinese—here are some quotes translated via Google Translate:
Make the type-level operations more “strictly-typed”
。业内人士推荐体育直播作为进阶阅读
This makes reading the book an experience like nothing else. Pages are linked with cross-references, giving it a game-like, exploratory feeling. At various points, atmospheric photographs of games taken off cathode ray tube screens are spread across three separate panels, but the panels are distributed almost randomly throughout the book—making it a sort of puzzle to be able to view the whole image.
free_table[j] = h-next_free;