The tutorial discusses algorithms for solving the most widespread classes of problems that cover almost the entire field of programming: search and sorting, numerical algorithms and algorithms on graphs. Particular attention is paid to parallel processing algorithms, rarely covered in the literature in Russian. In addition to the 2nd edition in Russian, information is given on the theory of algorithms, estimates of labor intensity and the latest algorithms that were not included in the original version of the book. The presentation is informal and extremely detailed, with a lot of exercises that allow self-control. The book is needed by everyone who has to write programs on their own - from programmers of banking systems to scientists.