I’m back. It took a while this break from writing.
Meanwhile I bought Elements of Programming Interview Exposed, Java version (http://talk.elementsofprogramminginterviews.com/) and reached DP, where I got stuck and lost it.
Now I started again the training and found out https://github.com/jwasham/google-interview-university. I forked it here (https://github.com/DaeMoohn/google-interview-university/tree/develop) and currently I’m reading the Schimdt book.