I have received Google on-site interview recently and I was told that the interview has been switched into a virtual interview. They suggested me to use their google doc plugin, Google Drawing, to draw out my thought. However, I found that it is quite slow to draw some data structures like trees. Therefore, I would like to draw these pictures on paint. However, it is still quite slow to draw some picture using my mouse, so I am now consider buying a writing board so that I can reduce the time of drawing. But it seems not worth to buy one for just a single interview, as these boards cost arround 40 dollars.

I do not have that much experience on virtual interviews, anybody can share your thought?