You may wonder, “Fenwick what? Which tree???”. Don’t be afraid of the spooky term the idea is pretty innocent. Remember: fear is the path to the dark side. First of all, let’s start with a simple problem: Imagine you have an array a of integers of length n. For the sake of simplicity let’s assume it is a one-dimensional array. You are given 2 values start and finish and your goal is to find a sum of all elements in this array between start and finish....

Hello and welcome to Algo Club 👋 My name is Alex and I am a software engineer. Yeah, a guy from IT. No, my office is not in the basement, I do speak with people, and, besides sweaters, my wardrobe has a lot of different clothes. I’ve been procrastinating for a long time (definitely for a few years) before started doing something. Literally, I was so unsure about anything so it was a real challenge to even pick up a proper name....

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