I was actually expecting that somebody did some machine learning / matching over a large set of pictures and found all those images / coordinates.
40 karma · joined November 10, 2011
It seams that qsort simply executes an order of magnitude more instructions for the same result than std::sort. On the other hand std::sort() code, even if it's faster, it has more branch miss-predictions.
Here [1] are the results if you want to have a look.