Sometimes, it's way too hard to keep in our mind all the possibilities and paths an algorithm is taking. The Hash Code 2019 Practice Problem is a good example.
This pizza viewer tries to help people to better understand what the provided solution is doing, because sometimes improvements are easier to find when using a visual tool. You can use it online here.
Clone the repo, go to the root of the project and run npm start. You will need npm and the angular CLI installed globally.
Just make a PR with anything you wanted to add.