I see a "g902.d" on that graph -- is that a typo?

EDIT: and also a g900.d and a g901.d. Maybe not a typo after all.

Thanks - that's a bit better of a teaser. I'm happy to see mine isn't red, but it's pretty tightly clumped in the main group of solutions. That's not really surprising as it's not that far off from your reference solution, which seems to be the most straightforward way to go about it.

Thanks! I just wanted to see how similar my submission was to everyone else's and if it was a fail.

Yeowch! Mine (g034.d) shows up as the second red dot from the left. I submitted a quick pseudocode answer without any research in an effort to mimic interview whiteboarding conditions.

I had no idea my solution would be automatically validated - I was happy enough to get an in-place O(n) solution. The complete lack of pointers on my part must be what separated me from the cluster of correct solutions at the center.

What proportion of the entries are on the graph?

Err. Never mind. Found what I was looking for in my inbox, buried. Thanks for the interesting experiment.

Edit: I suspect one of the clusters will be people like me who use array access syntax rather than pointer access.