I have learned a lot of basic data structures of linear tables, stacks, queues, trees and other algorithms, and the requirements for language expertise involved in searching them are not very high. You can understand the language foundation, but you need to practice more if you want to master it. I haven't remembered what I learned, but I haven't really understood the algorithm and data structure. I think this is a very powerful theme. In order to design an efficient, accurate, adaptable and reusable program, we must study the relationship between data attributes and data elements. Without algorithms, we don't know how to construct data. Practice is the only way out anyway. I'm ashamed.