To learn CCNPC, you need to master the basic knowledge of computer science and mathematics. It is recommended to buy the following textbooks: Introduction to Computer Science: This is a comprehensive introductory textbook for computer science, covering the basic knowledge of computer science, including computer architecture, data structure, algorithms, operating systems, computer networks, and so on. 2. Computer Network: This is a classic computer network textbook that provides a detailed introduction to the basic concepts, agreements, and technologies of computer networks, including the content of the IP/IP protocol, network topography, network equipment, network security, and so on. 3.<<Digital Signal Processing>>: This is a textbook on digital signal processing. It covers the basic concepts, algorithms, transformations, filtering, and other aspects of digital signal processing. It is very helpful for learning the NPC algorithm. Introduction to algorithms: This was a classic textbook that introduced in detail the design and analysis techniques of various algorithms, including divide and conquer algorithm, greedy algorithm, dynamic programming algorithm, backtracking algorithm, and so on. Computer Systems: A Programmer's Perspective: This is a textbook on computer systems that provides a detailed introduction to the composition, principles, and implementation of computer systems, including CPU, memory, storage, operating system, and so on. The above textbooks were all classic textbooks that were very helpful in learning the NPC algorithm. They could choose suitable teaching materials according to their actual situation and needs. At the same time, it was recommended to participate in some online courses or offline training courses to better learn the theory and practice of the NPC algorithm.