1. General C/C++ questions. Know your stuff well
2. Go over C++ program' pointing out all bugs and inefficiences.
3. Implement bit counting in C trivially (On) and efficiently (O1), think about sacrificing size.
4. Design question: Present a design for Wending machine - you drop coins of different value, choose a drink and get change. You as well might choose to cancel an order and get money back. In this one you will not get much time to think of it, they expect you to spit it on the fly and correctly right away.
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