(The word second in the following text does not mean an actual second, it is used as a placeholder for an undefined time unit) The task Imagine you have a keyboard layout with only letters like so: q w e r t y u i o p a s d f g h j k l z x c v b n m Whenever you press a key, for example f, th...

using Prefixed Length Code We are going to implement a compression of text (string, array/list of characters/bytes) by simple substitution of each character by a binary code, based on the frequency of that character in the text. The characters that occur more frequently will be replaced by shorte...

Introduction In Tennis, the server alternates serving on the left side or the right side of the court every point, starting on the right. It is possible to figure out which side to serve on for that point just based on the score; if there have been an even number of points you serve on the right,...

History There's a room on StackOverflow in Russian where you can see such an interesting discussion: Just because there are not enough real discussing in that room, @Grundy "plays ping-pong" to keep it unfrozen. Task Implement a bot for StackExchange that posts "ping!" to the 22474 room if the...