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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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Hi!
What helped me a lot is a glance at process of building a binary syntax tree, which i read in "You don't know JavaScript" series of books (dont remember which exactly).
You might also want to solve an easier version of this kata - "Calculator" by obrock, after which solving current one is pretty straightforward.
To be more specific, I mean three and more intersections when a single coordinate(point) belongs to three or more rects.
Are there any multiple intersections (3 and more)?
Bring the hard one in;