#!/usr/bin/perl -w
use strict;

my $before = [qw(1 2 3 4 5 6 7 8 9 10)];
my $after  = [qw(2 3 4 5 1 6 7 8 9 10)];

my %start;
@start{@{$before}} = @{$after};

#every little shift.
my %moved = map{
	($_ != $start{$_}) ? ($_, $start{$_}) : ()
	}keys %start;

#shifts larger than one.
my %huge_offset = map{
	(abs($_ - $start{$_}) > 1) ? ($_, $start{$_}) : ()
	} keys %start;

#lets check what we have...
print "BEFORE:\t";
print "@$before\n";

print "AFTER:\t";
print "@$after\n";

print "\nOFFSETS:\n";
print "$moved{$_}: ".($start{$_}-1)." to ".($_ - 1)."\n" for( sort {$a<=>$b} keys %moved);

print "\nHUGE OFFSETS:\n";
print "$huge_offset{$_}: ".($start{$_}-1)." to ".($_ - 1)."\n" for( sort {$a<=>$b} keys %huge_offset);