Google

It is hard, and you should review data structures and algorithms for that. This is my personal opinion. Don't believe it 100%; try to figure it out by yourself.

The interview process was very smooth, and the team was very nice throughout. I had a good time interviewing, and it was a great experience. The questions were difficult, so more practice would have been beneficial.

This was for the software program called STEP, and it is for freshman and sophomore college students. They asked pretty simple intro-to-programming questions. They literally asked me to find the second-largest element in an array.