Greetings,
I liked the hash approach holli suggested.
Here are my thoughts.
#!/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( so
+rt {$a<=>$b} keys %huge_offset);
and the output.
BEFORE: 1 2 3 4 5 6 7 8 9 10
AFTER: 2 3 4 5 1 6 7 8 9 10
OFFSETS:
2: 1 to 0
3: 2 to 1
4: 3 to 2
5: 4 to 3
1: 0 to 4
HUGE OFFSETS:
1: 0 to 4
-InjunJoel
"I do not feel obliged to believe that the same God who endowed us with sense, reason and intellect has intended us to forego their use." -Galileo
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