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;
}
The above code will give the following result:
Ok Ok Error Error Error Which is what we expect.
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