I love everything about this site and seems like every question is handpicked. One thing you should consider is changing the pricing , I mean it may be nothing for working professional but its way too much for student .Even 10$ a month is better as none can ace all these question in a week , I think everyone need around 6 months and I wish you should give student discount on college id.
Any Amazon onsite (i.e., the VO) specifics like problem types would be incredibly value adding
Most of the Two Pointers links above bring us to the same page & no problems/solutions.
I found similar list with the same problems and solutions . See below
Hope that helps