The following is my little implementation:
#!/usr/bin/perl
use strict;

my @list1 = qw/ 1 2 3 4 5 6 /;
my @list2 = qw/ 6 2 1 5 4 3 /;
my @list3 = qw/ 7 1 6 5 4 3 /;
my @list4 = qw/ 4 5 7 6 2 3 /;
my @list5 = qw/ 0 4 5 6 2 3 /;

printf "%s\n", validate_number_list (\@list1) ? "Ok" : "Error";
printf "%s\n", validate_number_list (\@list2) ? "Ok" : "Error";
printf "%s\n", validate_number_list (\@list3) ? "Ok" : "Error";
printf "%s\n", validate_number_list (\@list4) ? "Ok" : "Error";
printf "%s\n", validate_number_list (\@list5) ? "Ok" : "Error";

sub validate_number_list()
{
    my ($list) = @_;
    my @sorted_list = sort { $a <=> $b } @{$list};
    my $prev;
    foreach (@sorted_list)
    {
        $prev + 1 != $_ ? return(0) : {$prev = $_};
    }
    return 1;
}

[download]
The above code will give the following result:

Ok
Ok
Error
Error
Error

Which is what we expect.

In reply to Re: Validate array of numbers in sequence by Roger
in thread Validate array of numbers in sequence by AcidHawk

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