use strict;
use warnings;
# initial data
my @x   = qw/c d e f k l m n/; 
my @y   = qw/4 6 5 2 9 7 8 3/; 
# store in hash to keep association between x and y after sorting
my %data;
for my $i (0..@x-1) {
		$data{$i}{x} = $x[$i]; # store x corresponding to position $i
		$data{$i}{y} = $y[$i]; # store y corresponding to position $i
}
# sort positions with respect to y
my @sorted = sort { $data{$a}{y} <=> $data{$b}{y} } keys %data;
print "Sorted data:\n";
for my $i (@sorted) {
		print "$data{$i}{y} corresponds to $data{$i}{x} at position $i\n";
}