I got a phone interview from Yahoo!.

They asked what kind of programming languages I use most and went through all the questions on those languages that I mentioned. In my case, it was C, C++, and Java.

For C, it is important to know low-level instructions and macros.

For C++ and Java, they asked details of OOP design.

Regarding operating systems, they asked how to measure system performance in Unix. This requires explaining the commands.

I was also asked about Balanced Search Trees.

I was asked to implement one.

In my case, I was not prepared much.

If you want to prepare for the Yahoo! interview, you should be prepared thoroughly.

Implementing Balanced Search Tree, I thought they asked for BST (Binary Search Tree).