The solution for Bigger is Greater challenge on HackerRank, or how to generate next lexicographically greater string. Problem description, algorithm steps and complete source code to solve this challenge.

Last year, the Infinite House of Pancakes introduced a new kind of pancake. It has a happy face made of chocolate chips on one side (the “happy side”), and nothing on the other side (the “blank side”).

You are the head cook on duty. The pancakes are cooked in a single row over a hot surface. As pa...

With this post I want to begin a series of posts about general algorithms. It is not an accident I started with the prime numbers. This is basic problem to solve when you are starting with programming. And one more reason – I was curious how RSA algorithm works and the important part of the algorithm is to generate two random big prime numbers.

I am working for a Start Up project – DiagramArt, where we needed to create Android application which : load list of diagrams from API, show these diagrams to the user and some other stuff of course. The list consists from a preview picture, diagram’s title and its description. There is no problem to load and show these data, the problem was in the preview picture.

Few weeks ago in the late night, my friend asked me, where do I take the energy. He knows I have work, couple of sides projects and from time to time I try to write here some post. Is it some kind of a coffee? Or something else? I didn’t know how to answer, but I was thinking about it during a walk.