I had a hangout call with one of Google's engineers in London. He asked me to design/code a Photoshop wand in C++.

I discussed how to select a region of interest and loop over neighboring pixels. There was very little guidance. I asked many questions, but the interviewer was reluctant to interject.

We discussed image planes, formats, and how to navigate/index color components using nested for loops.

At the end, the interviewer said I should have used a stack. I quickly coded a stack using STL, and we said goodbye.

The HR told me, after I poked them three times and waited about two weeks, that I was rejected. I feel the question didn't really test my video engineering knowledge. The question wasn't clear, the solution discussion wasn't fair, and the follow-up process was lame.

Design/code a Photoshop wand.