use strict;
use warnings;
sub qsort{my$p=@_?shift:return;qsort(grep{$_<$p}@_),$p,qsort(grep{$_>=$p}@_)}
use List::Util qw/shuffle/;
my @a = shuffle (0..100);
$,=',';
$\="\n";
print @a;
print qsort(@a);

3,72,41,2,9,66,84,7,54,55,95,100,65,0,69,24,96,5,39,31,64,48,10,61,22,62,81,74,58,49,97,14,94,43,76,80,50,85,83,8,38,20,17,28,46,23,32,19,79,90,34,87,88,67,89,29,33,30,4,71,86,93,37,36,51,78,75,82,26,47,52,70,92,21,40,57,1,56,44,6,68,42,91,77,18,12,15,53,59,27,13,11,99,35,98,73,63,25,16,60,45
0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100