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#!/usr/bin/env perl
use strict;
use warnings;
use experimental qw{ say postderef signatures state };
my @examples = (
[ 0, 1, 3 ],
[ 0, 1 ],
[ 1, 3, 5, 7, 9 ]
);
for my $e (@examples) {
my $list = join ',', $e->@*;
my @out = missing_numbers( $e->@* );
my $out = join ',', @out;
say <<"END";
Input: \@array = ($list)
Output: $out
END
}
sub missing_numbers ( @array ) {
my $n = scalar @array;
my %h = map { $_ => 1 } @array;
my @output;
for my $v ( 0 .. $n ) {
push @output, $v unless $h{$v};
}
return @output;
}
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