The book contains a large set of programming tasks of various difficulty levels, which will allow the teacher to conduct classes with applicants and students with different levels of initial training, practically forming individual educational trajectories for them. The tasks are selected taking into account the gradual increase in complexity and are accompanied by full texts of solutions in the Pascal programming language, including those intended for detailed analysis by students, searching for inaccuracies, creating improved own versions of programs, analyzing the permissible ranges of initial data, etc. For computer science teachers, applicants and students.