PostScript
% Quicksort
%
% Chris Collins <xfire@xware.cx>
% 17-Sep-2001
/qsort { dup length 1 gt { << exch /xlt [ ] /xgt [ ] /x 6 5 roll dup 0
+ get
exch dup length 1 sub 1 exch getinterval /xs exch >> begin 0 1 xs leng
+th 1
sub { xs exch get dup x lt exch [ exch 3 2 roll { xlt aload pop ] /xlt
+ } {
xgt aload pop ] /xgt } ifelse exch store } for [ xlt qsort aload pop x
+ xgt
qsort aload pop ] end } if } def
[ 5 2 5 7 9 3 ] qsort ==
[ 3 5 2 1 5 2 9 6 3 5 7 ] qsort ==
«The Crux of the Biscuit is the Apostrophe»
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