Google Code Jam 2017: Oversized Pancake Flipper

JavaScript Algorithms Google Code Jam

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...

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Prime numbers

Algorithms Go Java

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.

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Loading images and caching them with Fresco in Android

Java Android Fresco

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.

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Where do I take my energy

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.

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Express server with JWT authentication

JavaScript Node.js Express JWT Example project

I needed to create a simple server, that would have one “public” route /login and other routes are available only for users with valid JWT token.

That means, the user is allowed to log into the system and then get any data from it. If he is not logged in and he tries to get some data, he only get an error message and 401 ( Unauthorized ) status code will be returned.

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