Hi,
I have got a hard time understanding the problems given in the Quantum contest. So, to understand the sentence I first have to understand the words. To understand the words, I have to recognize the characters... kind of like starting at zero.
So, where is the entrance, the "Hello World" tutorial which makes me understanding even the notation of the problems, described for example here: Wikipedia Bra-Ket
Thanks
Auto comment: topic has been updated by spookywooky (previous revision, new revision, compare).
Microsoft Q# docs are pretty nice overview of the main quantum concepts. They also contain references.
In general, you should be familiar with linear algebra if you want to dive to quantum computing.
This resource assumes that you have pretty much no previous knowledge in mathematics, but it really only teaches you the necessary things for quantum computing. If you want to get a bit more into the required topics, I suggest reading a book on linear algebra, then reading everything that is linked in the official announcement.
TNX for http://lapastillaroja.net/wp-content/uploads/2016/09/Intro_to_QC_Vol_1_Loceff.pdf