https://textbookpricecheck.com 2026-05-27 daily 1.0 https://textbookpricecheck.com/book/9780131103627-the-c-programming-language 2026-05-27 weekly 0.8 https://textbookpricecheck.com/book/9780201633610-design-patterns-elements-of-reusable-object-oriented-software 2026-05-27 weekly 0.8 https://textbookpricecheck.com/book/9780262033848-introduction-to-algorithms-3rd-edition 2026-05-27 weekly 0.8