I wonder if the author is aware of antiqsort

https://www.cs.dartmouth.edu/~doug/aqsort.c and https://github.com/matslina/qsort/blob/master/antiqsort.c ...

The textbook solution is to use this pivot selection algorithm:

https://en.wikipedia.org/wiki/Median_of_medians

In practice it is not really worth it.

The light grey text with the white background, seems to be a popular design choice. But I have trouble reading this page do to the lack of contrast.

This was just as ridiculously nerdy as it was when friends of mine from school and I did it in 1981 -- in basic on the trs80 though :D