Zalando Research Engineer interview questions

1st interview's question: 1. How to handle conflicts when you work? 2. How to rate your skill on Java? 3. What was the most difficult time during your study? 2nd interview's questions: 1. Given an array of n numbers from 0 - n (missing one number) → you need to find the missing number 2. Given a directed graph (figure), implement the structure and a deep copy function 3rd, 4th, 5th interviews' questions: 1. What different is java 8 from java 7? What is the functions in an interface which let you do multiple inherent? 2. Implement pretty print in Java 3. Given a long string (e.g., “afdslfdlskfd…”) and a dictionary (e.g., “a”, “ab”, “sdf”, etc.). Check whether the string is a concatenation of words in dictionary, if yes, please print a solution 4. What is SVM, logistic regression? How it work and how to implement them?