#!/bin/env perl

use strict;

use Data::Dumper;

use constant REQUIRED_FIELDS => qw/zero one two three four five six seven/;

my $a = [qw/three one two/];
print Data::Dumper->Dump([$a], ['a']);
verify($a);
exit;

sub verify {
    my $a = shift;

    my $fields = [REQUIRED_FIELDS];

    my $href = {};
    foreach my $e (@$a) {
        my $i;
        foreach my $field (@$fields) {
            if ($e eq $field) {
                $href->{$field} = 0;
                splice @$fields, $i, 0;
                print Data::Dumper->Dump([$i, $fields], [qw/i fields/]);
            }
            ++$i;
        }
    }

    print Data::Dumper->Dump([$href], [qw/href/]);
}