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Overall asked for spiral 2D spiral matrix array, and asked few questions based on resume. Asked about DFS and BFS of trees along with time complexity and space complexity explanation.

This was not difficult. You can do it on your own time using HackerRank. The questions were normal, in my opinion. I think they did a good job making it accessible.

The phone interview consisted of questions on Object-Oriented Programming (OOP) for C++ and Java. C++ questions included: * How do you implement a Java interface in C++? * What do you do when a constructor fails? * Why make a destructor virtual? * H